EML: Issueshttps://projects.ecoinformatics.org/ecoinfo/https://projects.ecoinformatics.org/ecoinfo/ecoinfo/favicon.ico?14691340362005-06-14T19:42:06ZEcoinformatics Redmine
Redmine Bug #2125 (New): Cannot define SOM map projection in spatialRaster element of EML2.0.1https://projects.ecoinformatics.org/ecoinfo/issues/21252005-06-14T19:42:06ZMark Servillaservilla@lternet.edu
<p>I am having trouble defining the Space Oblique Mercator map projection<br />in the spatialRaster subtree of EML. The problem is unique to the SOM<br />(any oblique map projection, for that matter) projection - the SOM does<br />not use a prime meridian in the usual sense (i.e., it is fixed to the<br />flight path of the Landsat satellite, not a geographic coordinate system).<br />Since EML requires the primeMeridian-longitude and unit-name attributes<br />to be strictly defined, the document will not validate. Is there a<br />recommendation from the EML community for how to deal with this issue,<br />perhaps making the aforementioned attributes optional?</p>
<p>I have included below an example of how I would define this projection.</p>
<p>Notes:<br />1. The SOM projection does not appear to be common in the remote<br />sensing world other than EOSAT/Landsat/IRS formats. Unfortunately, we have<br />much data in this projection.<br />2. FGDC has a separate element for this projection in their schema.<br />Actually, FGDC has a separate element for each major projection definition.</p>
<p><spatialReference><br /> <horizCoordSysDef name="SOM"><br /> <projCoordSys><br /> <geogCoordSys><br /> <datum/><br /> <spheroid name="International_1909" semiAxisMajor="6378388" <br />denomFlatRatio="0.996633"/><br /> <primeMeridian longitude=""/><br /> <unit name=""><br /> </geogCoordSys><br /> <projection><br /> <parameter name="Landsat_Number" value="5"/><br /> <parameter name="Landsat_Path" value="36"/><br /> <parameter name="False_Easting" value="0"/><br /> <parameter name="False_Northing" value="0"/><br /> <unit name="meter"><br /> </projection><br /> </projCoordSys><br /> </horizCoordSysDef><br /></spatialReference></p>