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Bug #1730

ENM IID - Regridding (Resampling) of layer grid information

Added by Dan Higgins over 16 years ago. Updated almost 16 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
beam
Target version:
Start date:
10/22/2004
Due date:
% Done:

0%

Estimated time:
Bugzilla-Id:
1730

Description

It is assumed that all the input layer data have been converted to a standard
ascii grid format; i.e. equally spaced (in lat/long spaced) with ascii space
delimited values (integers or fp?). This incluce some grid values marked as
having 'missing data'.
Example Header:
ncols 720
nrows 360
xllcorner -180.0
yllcorner -90
cellsize 0.5
NODATA_value -9999

All environment layers input to GARP must have the same resolution. We thus need
an actor which will regrid the raster to specified grid spacing (so that grids
match for all layers)

Responsible Party: Jianting?


Related issues

Blocked by SEEK - Bug #1724: ENM II - Prepare Spatial Layers for GARP layer inputIn Progress10/22/2004

History

#1 Updated by Dan Higgins over 16 years ago

Note on terminology:
In grass, there is a raster operation called 'r.resampling'. When the resolution
of a raster changes from lower to higher resolution, the high resolution cells
are assigned the same values as the cell within which they are located. In going
from high to lower resolution, the lower resolution cell is assigned the value
of the higher resolution cell nearest to its center. Thus 'resampling' always
assigns existing grid values to new grid positions. This process is primarily
meant to be used for categorical grid data. If the grid represents continuous
data, then one of several other raster algorithns which interpolate values to
the new locations is usually used. (Dan Higgins)

#2 Updated by Dan Higgins almost 16 years ago

carried out at in GridRescaler actor

#3 Updated by Redmine Admin about 8 years ago

Original Bugzilla ID was 1730

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