Revision 6844
Added by Matt Jones over 12 years ago
| docs/dev/metacat/source/submitting.rst | ||
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Using the EarthGrid API (aka EcoGrid) |
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------------------------------------- |
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.. Note:: |
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The EarthGrid/EcoGrid web service API is *deprecated* and will be removed from |
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a future version of Metacat. Its functionality is being replaced by the |
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standardized DataONE REST service interface. |
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The EarthGrid (aka EcoGrid) provides access to disparate data on different |
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networks (e.g., KNB, GBIF, GEON) and storage systems (e.g., Metacat and SRB), |
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allowing scientists access to a wide variety of data and analytic resources |
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(e.g., data, metadata, analytic workflows and processors) networked at different |
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sites and at different organizations via the internet. |
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Because Metacat supports the EarthGrid API (see table), it can query the |
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distributed EarthGrid, retrieve metadata and data results, and write new and |
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updated metadata and data back to the grid nodes. |
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For more information about each EarthGrid service and its WSDL file, navigate |
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to the "services" page on your Metacat server |
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(e.g., http://knb.ecoinformatics.org/knb/services). |
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Note that the AdminService and Version service that appear on this page are |
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not part of EarthGrid. |
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|
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EarthGrid/EcoGrid API Summary |
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|
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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| Service | Description | |
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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| AuthenticationQueryService | Search for and retrieve protected metadata and data from the EarthGrid as an authenticated user. | |
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| | | |
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| | Methods: ``query``, ``get`` | |
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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| AuthenticationService | Log in and out of the EarthGrid | |
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| | | |
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| | Methods: ``login``, ``logout`` | |
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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| IdentifierService | List, lookup, validate, and add Life Science Identifiers (LSIDs) to the EarthGrid | |
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| | | |
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| | Methods: ``isRegistered``, ``addLSID``, ``getNextRevision``, ``getNextObject``, ``getAllIds`` | |
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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| PutService | Write metadata to the EarthGrid | |
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| | | |
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| | Methods: ``put`` | |
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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| QueryService | Search for and retrieve metadata from the EarthGrid | |
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| | | |
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| | Methods: ``query``, ``get`` | |
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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| RegistryService | Add, update, remove, and search for registered EarthGrid services. | |
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| | Note: The WSDL for this service is found under http://ecogrid.ecoinformatics.org/registry/services | |
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| | | |
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| | Methods: ``add``, ``update``, ``remove``, ``list``, ``query`` | |
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+----------------------------+-----------------------------------------------------------------------------------------------------+ |
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Using Morpho |
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------------ |
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Morpho is a desktop tool created to facilitate the creation, storage, and |
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retrieval of metadata. Morpho interfaces with any Metacat server, allowing |
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users to upload, download, store, query and view relevant metadata and data |
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using the network. Users can authorize the public or only selected colleagues |
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to view their data files. |
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Morpho is part of the Knowledge Network for Biocomplexity (KNB), a national |
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network intended to facilitate ecological and environmental research on |
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biocomplexity. To use Morpho with your Metacat, set the Metacat URL in the |
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Morpho Preferences to point to your Metacat server. |
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.. figure:: images/screenshots/image049.png |
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:align: center |
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Set the Metacat URL in the Morpho preferences to point to your Metacat. |
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For more information about Morpho, please see: http://knb.ecoinformatics.org/morphoportal.jsp |
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Creating Your Own Client |
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------------------------ |
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Metacat's client API is available in Java and Perl (the Java interface is |
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described in this section and further detailed in the appendix). Some of the |
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API is also available in Python and Ruby. The API allows client applications |
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to easily authenticate users and perform basic Metacat operations such as |
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reading metadata and data files; inserting, updating, and deleting files; and |
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searching for packages based on metadata matches. |
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The Client API is defined by the interface edu.ucsb.nceas.metacat.client.Metacat, |
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and all operations are fully defined in the javadoc_ documentation. To use the |
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client API, include the ``metacat-client.jar``, ``utilities.jar``, and |
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``httpclient.jar`` in your classpath. After including these classes, you can |
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begin using the API methods (see the next table). |
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|
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.. _javadoc: http://knb.ecoinformatics.org/software/metacat/dev/api/index.html |
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The following code block displays a typical session for reading a document |
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from Metacat using the Java client API. |
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:: |
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String metacatUrl = "http://foo.com/context/metacat"; |
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String username = "uid=jones,o=NCEAS,dc=ecoinformatics,dc=org"; |
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String password = "neverHarcodeAPasswordInCode"; |
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try {
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Metacat m = MetacatFactory.createMetacatConnection(metacatUrl); |
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m.login(username, password); |
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Reader r = m.read("testdocument.1.1");
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// Do whatever you want with Reader r |
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} catch (MetacatAuthException mae) {
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handleError("Authorization failed:\n" + mae.getMessage());
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} catch (MetacatInaccessibleException mie) {
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handleError("Metacat Inaccessible:\n" + mie.getMessage());
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} catch (Exception e) {
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handleError("General exception:\n" + e.getMessage());
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} |
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Operations provided by Client API (Metacat.java class) |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| Method | Parameters and Throws | Description | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| delete | ``public String delete(String docid) throws InsufficientKarmaException, MetacatException, MetacatInaccessibleException;`` | Delete an XML document in the repository. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| getAllDocids | ``public Vector getAllDocids(String scope) throws MetacatException;`` | Return a list of all docids that match a given scope. If scope is null, return all docids registered in the system. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| getLastDocid | ``public String getLastDocid(String scope) throws MetacatException;`` | Return the highest document ID for a given scope. Used by clients to determine the next free identifier in a sequence for a given scope. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| getloggedinuserinfo | ``public String getloggedinuserinfo() throws MetacatInaccessibleException;`` | Return the logged in user for this session. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| getNewestDocRevision | ``public int getNewestDocRevision(String docId) throws MetacatException;`` | Return the latest revision of specified the document from Metacat | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| getSessonId | ``public String getSessionId();`` | Return the session identifier for this session. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| insert | ``public String insert(String docid, Reader xmlDocument, Reader schema) throws InsufficientKarmaException, MetacatException, IOException, MetacatInaccessibleException;`` | Insert an XML document into the repository. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| isRegistered | ``public boolean isRegistered(String docid) throws MetacatException;`` | Return true if given docid is registered; false if not. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| login | ``public String login(String username, String password) throws MetacatAuthException, MetacatInaccessibleException;`` | Log in to a Metacat server. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| logout | ``public String logout() throws MetacatInaccessibleException, MetacatException;`` | Log out of a Metacat server. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| query | ``public Reader query(Reader xmlQuery) throws MetacatInaccessibleException, IOException;`` | Query the Metacat repository and return the result set as a Reader. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| query | ``public Reader query(Reader xmlQuery, String qformat) throws MetacatInaccessibleException, IOException;`` | Query the Metacat repository with the given metacat-compatible query format and return the result set as a Reader. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| read | ``public Reader read(String docid) throws InsufficientKarmaException, MetacatInaccessibleException, DocumentNotFoundException, MetacatException;`` | Read an XML document from the Metacat server. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| readInlineData | ``public Reader readInlineData(String inlinedataid) throws InsufficientKarmaException, MetacatInaccessibleException, MetacatException;`` | Read inline data from the Metacat server session. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| setAccess | ``public String setAccess(String _docid, String _principal, String _permission, String _permType, String _permOrder ); throws InsufficientKarmaException, MetacatException, MetacatInaccessibleException;`` | Set permissions for an XML document in the Metacat repository. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| setMetacatUrl | ``public void setMetacatUrl(String metacatUrl);`` | Set the MetacatUrl to which connections should be made. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| setSessionId | ``public void setSessionId(String sessionId);`` | Set the session identifier for this session. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| update | ``public String update(String docid, Reader xmlDocument, Reader schema) throws InsufficientKarmaException, MetacatException, IOException, MetacatInaccessibleException;`` | Update an XML document in the repository by providing a new version of the XML document. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| upload | ``public String upload(String docid, File file) throws InsufficientKarmaException, MetacatException, IOException, MetacatInaccessibleException;`` | Upload a data document into the repository. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| upload | ``public String publicupload(String docid, String fileName, InputStream fileData, int size) throws InsufficientKarmaException, MetacatException, IOException, MetacatInaccessibleException;`` | Upload a data document into the repository. | |
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+----------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+ |
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| docs/dev/metacat/source/geoserver.rst | ||
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| 1 | 1 |
Metacat's Use of Geoserver |
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========================== |
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Under construction! |
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GeoServer 1.4.0, an open source Web Mapping Service (WMS) written in Java, is |
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bundled with Metacat and can be used to render spatial data as web-deliverable |
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maps (see figure). Metacat uses Community MapBuilder (a pure HTML and JavaScript |
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application that uses AJAX and XSLT) to provide a web-based user interface for |
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interacting with the generated maps. You can use any WMS-compatible client |
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(e.g., ArcGIS, QGIS, JUMP, UDig, OpenLayers, Mapbender, Map Builder). Please |
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note the mapping functionality is only supported for Metacat servlets running |
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under Tomcat 6 or later. |
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Heading 1 |
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------------ |
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IMPORTANT: Regardless of whether you plan on using the mapping functionality |
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you should, for security purposes, configure GeoServer so that it doesn't |
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use the default password. For instructions, please see |
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Geoserver Password Configuration. |
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Heading 2 |
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------------ |
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.. figure:: images/screenshots/image051.jpg |
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:align: center |
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A map generated by Metacat's GeoServer. Points and "bounding boxes" |
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represent the geographic extent of datasets stored in the KNB Metacat repository. |
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GeoServer supports a wide variety of vector GIS data sources, which can be |
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styled using Styled Layer Descriptors (SLDs) and output as images (the default) |
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or raw vector data (GML or KML). |
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Currently, GeoServer can be used with the following limitations: |
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* The GeoServer will only map documents that are publicly available. This is |
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because the mapping server's support for permissions control is not as |
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fine-grained as Metacat's. |
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* The GeoServer can only access documents that conform to one chosen schema. |
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This is because only one set of xpaths can be defined in the Metacat properties. |
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* GeoServer 1.4, the version bundled with Metacat, does not support raster |
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input (e.g., satellite imagery or digital elevation models). We suggest |
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setting up UMN Mapserver if you aim to serve raster data. |
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Metacat developers plan to continue extending and improving Metacat's mapping |
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capabilities. If you are interested in contributing to those efforts, or if |
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you are interested in learning more about the architecture and future plans for |
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the mapping software. |
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|
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Installing and Configuring |
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-------------------------- |
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Metacat's GeoServer is automatically installed when Metacat is installed. If |
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you do NOT wish to run GeoServer, set the runSpatialOption property in the |
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``metacat.properties`` file (found in the source code's lib directory) to |
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false before building and deploying Metacat. |
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|
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The GeoServer bundled with Metacat comes with a world-countries base layer |
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and a default configuration that is already aware of Metacat's spatial cache. |
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To further configure GeoServer, use its Web-based configuration utility, |
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which is available at: http://your.server.com/context/geoserver.jsp |
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(e.g., http://knb.ecoinformatics.org/knb/geoserver.jsp). |
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|
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Common configuration tasks include: |
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* Adding a Map to a Web Page or Skin |
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* Configuring the Size and Initial Extent of the Map |
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* Configuring the Layout of the HTML Mapping Interface |
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* Changing the Lat/Long Display to Degree-Minutes-Seconds |
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* Configuring the "Select Location Drop-down Menu |
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* Configuring the Visual Portrayal of Geospatial Data (e.g., symbology and color) |
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* Adding Other Spatial Datasets to the Web Map |
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.. figure:: images/screenshots/image053.jpg |
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:align: center |
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GeoServer's Web-based administrative interface. |
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Note: Some configurations may need to be made to the XML files as well. |
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Community Mabuilder, which Metacat uses as the front-end for GeoServer's WMS |
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service, provides interface components or "widgets" (e.g., the map, a box zoom, |
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layer list, "Select Location" drop-down menu, scale bar, lat/long coordinates, |
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and a query form) that make it easy to deploy highly-functional Web mapping |
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applications with minimal coding. The WMS layers are configured through a Web |
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Map Context (WMC) document. This context document can be edited to customize |
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the initial extent of the map, the ordering and visibility of layers and, of |
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course, the source and name of the WMS layer. |
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|
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Mapbuilder has three main configuration files used to customize the map |
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interface (Table 5.1). If you plan to customize the map interface, you must |
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use a source code distribution of Metacat. Default configurations are in:: |
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$METACAT/lib/style/common/spatial_templates/spatial1/ |
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|
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+--------------------------------+-------------+---------------------------------------------------------------------+ |
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| Document | Location | Description | |
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+--------------------------------+-------------+---------------------------------------------------------------------+ |
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| Web map context document (WMC) | context.xml | The WMC is used to customize the initial extent of the map, | |
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| | | the order of the map layers, and the source and name of each layer. | |
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+--------------------------------+-------------+---------------------------------------------------------------------+ |
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| Mapbuilder configuration file | context.xml | Defines the Mapbuilder widgets and their behavior | |
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+--------------------------------+-------------+---------------------------------------------------------------------+ |
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| The Map file | map.html | Loads the Mapbuilder JavaScript library and controls the | |
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| | | HTML layout of the widgets. | |
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+--------------------------------+-------------+---------------------------------------------------------------------+ |
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|
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NOTE: By default, the first time Metacat is restarted, it generates a |
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"spatial cache" containing geographic information about documents in its |
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repository. This default behavior is specified in lib/metacat.properties, |
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where the regenerateCacheOnRestart parameter is set to true. The information |
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in the spatial cache is stored in a GIS-compatible format (the ESRI Shapefile) |
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and consists of the document name and its geographic coverage. When documents |
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are inserted, deleted, and updated in the Metacat repository, Metacat |
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automatically syncs the spatial cache to reflect the changes. Because |
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generating the cache can take a considerable amount of time (several minutes |
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in the case of a few thousand documents), Metacat resets the |
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regenerateCacheOnRestart property to false after the spatial cache has been |
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generated. Note that if you upgrade or reinstall Metacat, the spatial cache |
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will be regenerated again. |
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|
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Adding a Map to a Web Page or Skin |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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To add a map to a Web page, simply include the map interface using an iframe:: |
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|
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<iframe scrolling="no" frameborder="0" width="736" height="520" |
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src="/knb/style/common/spatial_templates/spatial1/map.html"> |
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</iframe> |
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|
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The map URL, ``/knb/style/common/spatial_templates/spatial1/map.html``, is |
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the default map interface. If you plan to customize the map interface, copy |
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the spatial1 directory into your skin's directory (either the default or |
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customized skin directory). |
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|
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:: |
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|
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cp -r style/common/spatial_templates/spatial1 /style/skins/<myskin>/spatial |
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You can access the customized map with the URL: ``/knb/style/skins/<myskin>/spatial/map.html`` |
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|
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Configuring the Size and Initial Extent of the Map |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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Before you configure the size and initial extent of the map, make sure that you |
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have copied the default spatial settings into your skin's directory (see :doc:`configuration`). |
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Once the settings have been copied, you can modify the map's initial extent in |
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the context settings: ``${skin.dir}/spatial/context.xml``.
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|
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To change the map size and/or initial extent, edit the following lines:: |
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|
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<Window width="720" height="360" /> |
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<BoundingBox SRS="EPSG:4326" minx="-180" miny="-90" maxx="180" maxy="90" /> |
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|
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Where ``width`` and ``height`` specify the map size in pixels, ``minx/maxx`` |
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represent the range of longitudes and ``miny/maxy`` represent the range of latitudes. |
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|
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Configuring the Layout of the HTML Mapping Interface |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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Before you configure the size and initial extent of the map, make sure that |
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you have copied the default spatial settings into your skin's directory. |
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Once the settings have been copied, you can modify the layout here: |
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``${skin.dir}/spatial/map.html``.
|
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|
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``Map.html`` is a simple HTML file with a tabular layout. Map components are |
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abstracted into "widgets", blocks with a specific id (e.g., locationsSelect |
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and mainButtonBar), which can be reorganized within the table. |
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To customize the map extent and appearance, modify the Web map context |
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document (``context.xml``) and/or Mapbuilder's configuration file (``config.xml``). |
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Both files are in the spatial directory inside the skins folder. |
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|
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Changing the Lat/Long Display to Degree-Minutes-Seconds |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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By default, the map display shows the cursor's position in decimal degrees |
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(the preferred format for many GPS/GIS applications). To report coordinates as |
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degrees minutes-seconds, edit the spatial configuration file: |
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1. If you have not already copied the default spatial settings into your skin's |
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directory, do so now |
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2. Open the ${skin.dir}/spatial/config.xml file.
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3. Edit the CursorTrack widget so that the content is the following: |
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:: |
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<CursorTrack id="cursorTrack"> |
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<mouseHandler>mainMap</mouseHandler> |
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<showDMS>true</showDMS> |
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<showLatLong>true</showLatLong> |
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</CursorTrack> |
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4. Save and close the configuration file. |
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Configuring the "Select Location" Drop-down Menu |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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Before you configure the menu items, make sure that you have copied the default |
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spatial settings into your skin's directory. |
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The locations that appear in the "Select Location" drop-down menu are specified |
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in the ``${skin.dir}/spatial/named_locations.xml`` file. Each location is
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defined as a ``gml:featureMember``. Edit the featureMember's ``gml:name`` and |
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``gml:coordinates`` fields to edit or add new locations. |
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:: |
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<gml:featureMember> |
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<locationDef> |
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<gml:name>ACM Wilderness Field Station</gml:name> |
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<spatialKeyword> |
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<gml:location> |
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<gml:Envelope srsName="http://www.opengis.net/gml/srs/epsg.xml#4326"> |
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<gml:coordinates>-91.956,47.87 -91.706,48.12</gml:coordinates> |
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</gml:Envelope> |
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</gml:location> |
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</spatialKeyword> |
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</locationDef> |
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</gml:featureMember> |
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Configuring the Visual Portrayal of Geospatial Data (e.g., symbology and color) |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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Geospatial data sets are styled through the use of Styled Layer Descriptors |
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(SLD). The default SLDs used for the data points and data bounding boxes are in |
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``/lib/spatial/geoserver/data/styles/`` and are named data_points_style.sld and |
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data_bounds_style.sld, respectively. |
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You can find a more detailed tutorial on using SLD with GeoServer at:: |
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http://geoserver.org/display/GEOSDOC/SLD+Intro+Tutorial. |
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Adding Other Spatial Datasets to the Web Map |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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If you have vector GIS data sets, such as weather or topographical information, |
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on your server that you'd like to include in the interactive map, you must |
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first register the data set with GeoServer. After the data set has been |
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registered, you can add the layer to the map. You can also add spatial layers |
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that have been made publically available through WMS (There are hundreds of |
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spatial data sets available. Check out wms-sites.com for good catalog). |
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Instructions for adding publically available layers are included at the end |
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of this section. |
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| 231 |
To register the data set and add it to the map: |
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| 233 |
1. Point your browser to http://your.server/context/geoserver.jsp, log in to |
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GeoServer, and navigate to the "Data Stores" configuration page |
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| 235 |
under Config > Data > Stores. |
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| 236 |
2. Create a new Shapefile and assign it a DataStore ID. The DataStore ID can |
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| 237 |
contain letters and numbers. It is just used internally, and should be |
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| 238 |
unique. Click New. |
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| 239 |
|
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| 240 |
.. figure:: images/screenshots/image055.jpg |
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| 241 |
:align: center |
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| 242 |
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|
| 243 |
Creating a new shapefile using GeoServers web-based administrative interface. |
|
| 244 |
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|
| 245 |
3. On the next screen, select the "metacat" namespace from the drop-down menu |
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| 246 |
and point to the GIS data file on the file system, relative to: |
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| 247 |
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| 248 |
:: |
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| 249 |
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| 250 |
{tomcat.dir}/webapps/{context}/
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| 251 |
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|
| 252 |
The Description, if specified, is mostly used internally to provide other |
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| 253 |
administrators with information about the DataStore. Click Submit. |
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| 254 |
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|
| 255 |
4. Navigate to the "Feature Type" configuration page under |
|
| 256 |
Config > Data > Feature Type. Select your new data store from the |
|
| 257 |
drop-down menu. Click New. |
|
| 258 |
5. Style the layer using a style from the drop-down style menu, or click |
|
| 259 |
"Create new SLD" to create a new Style object and corresponding SLD |
|
| 260 |
(this option provides more control over the style). You should also define a |
|
| 261 |
spatial reference system (SRS) number for the new layer. |
|
| 262 |
Most lat/long data is "4326". If your data is in another projection, |
|
| 263 |
determine its spatial reference system using the help links provided. |
|
| 264 |
|
|
| 265 |
.. figure:: images/screenshots/image057.jpg |
|
| 266 |
:align: center |
|
| 267 |
|
|
| 268 |
GeoServer's FeatureType Editor. The Style and SRS settings discussed in step 5 are highlighted. |
|
| 269 |
|
|
| 270 |
6. Click "Apply" and "Save" |
|
| 271 |
7. Try out the styled data set as a WMS layer using a URL like: |
|
| 272 |
|
|
| 273 |
:: |
|
| 274 |
|
|
| 275 |
http://your.server/context/wms?VERSION=1.1.1&REQUEST=GetMap&SERVICE=WMS&LAYERS=metacat:newLayer&SRS=EPSG:4326&BBOX=-180,-90,180,90&WIDTH=720&HEIGHT=360&FORMAT=image/gif&STYLES=&TRANSPARENT=TRUE&UNIQUEID= |
|
| 276 |
|
|
| 277 |
Where your.server/context is the name of your server and context (e.g., |
|
| 278 |
http://knb.ecoinformatics.org/knb) and newLayer is the name of the new layer. |
|
| 279 |
The other parameters control which part of the layer is displayed. |
|
| 280 |
|
|
| 281 |
If data is properly displayed, add the map to your map context document (Step 8). |
|
| 282 |
|
|
| 283 |
8. Locate the Web map context document (usually {skin}/spatial/context.xml) and
|
|
| 284 |
open the file in a text editor. |
|
| 285 |
9. Locate the Layer entry for an existing layer next to which you wish to stack |
|
| 286 |
your layer (the first layers in the context are rendered at the bottom). |
|
| 287 |
|
|
| 288 |
10. Create a new Layer entry, by copying and pasting the existing entry for the |
|
| 289 |
metacat data_points layer and editing the Layer Name and Title. The title |
|
| 290 |
is displayed in the map legend. Note: if you'd like to use transparency, |
|
| 291 |
leave the image format set to image/gif (IE pre-7 has trouble with PNG |
|
| 292 |
transparency). |
|
| 293 |
|
|
| 294 |
:: |
|
| 295 |
|
|
| 296 |
<Layer queryable="0" hidden="0"> |
|
| 297 |
<Server service="OGC:WMS" version="1.1.1" |
|
| 298 |
title="DatasetPoints"> |
|
| 299 |
<OnlineResource xlink:type="simple" xlink:href="../../../../wms" /> |
|
| 300 |
</Server> |
|
| 301 |
<Name>metacat:data_points</Name> |
|
| 302 |
<Title>Dataset Points</Title> |
|
| 303 |
<SRS>EPSG:4326</SRS> |
|
| 304 |
<FormatList> |
|
| 305 |
<Format current="1">image/gif</Format> |
|
| 306 |
</FormatList> |
|
| 307 |
</Layer> |
|
| 308 |
|
|
| 309 |
11. Point your browser to the map interface. Your new layer should appear with |
|
| 310 |
the existing ones. |
|
| 311 |
|
|
| 312 |
Adding External Spatial Data Made Publically Available through WMS |
|
| 313 |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
|
| 314 |
There are hundreds of sources of spatial data made publically available |
|
| 315 |
through WMS. (check out http://wms-sites.com for good catalog). To add these |
|
| 316 |
data sources to your map, locate your skin's context file |
|
| 317 |
(``${skin.dir}/spatial/context.xml``) and add a new Layer by copying and
|
|
| 318 |
pasting an existing Layer and modifying as appropriate: modify the |
|
| 319 |
OnlineResourceURL, Name, Title and Style to match the WMS layer you'd like to |
|
| 320 |
use. See the mapbuilder Add WMS Tutorial for further details. |
|
| 321 |
|
|
| 322 |
Spatial Queries |
|
| 323 |
--------------- |
|
| 324 |
To find out which documents in the Metacat repository lie in a specified |
|
| 325 |
geographic region, query the spatial cache using Metacat's spatial_query action. |
|
| 326 |
Metacat can perform any query supported by the WFS/WMS standards. |
|
| 327 |
|
|
| 328 |
An example of a spatial query string is:: |
|
| 329 |
|
|
| 330 |
http://localhost/knb/metacat?action=spatial_query&xmin=-117.5&xmax=-64&ymin=3&ymax=46&skin=default |
|
| 331 |
|
|
| 332 |
Where ``xmin``, ``xmax``, ``ymin`` and ``ymax`` represent the western, eastern, |
|
| 333 |
southern and northern bounding coordinates (the "bounding box"), respectively. |
|
| 334 |
The spatial query action returns all documents that overlap or that are |
|
| 335 |
contained inside the specified spatial coordinates. The result set is returned |
|
| 336 |
as HTML using the style of the specified skin (in this example, default). |
|
| 337 |
|
|
Also available in: Unified diff
Completed 'Submission' page conversion, and also converted GeoServer docs to
RST format.