I am trying to export an image to an excel file having lat, long, rgb values
for all the points on the image. Does anyone know where I should look, have
some idea...any help would be greatly appreciated
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You could try r.out.xyz for each layer , then join the columns .
The opinions I express are my own and are not representative of the official policy of the U.S.Fish and Wildlife Service or Dept. of the Interior. Life is too short for undocumented, proprietary data formats.
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sarthakahuja <sarthakahuja@gmail.com> 09/09/2011 03:37 PM |
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[GRASS-dev] export question |
I am trying to export an image to an excel file having lat, long, rgb values
for all the points on the image. Does anyone know where I should look, have
some idea...any help would be greatly appreciated
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thanks a lot, do you know how to get their red, green, blue values (0-255)
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sarthakahuja wrote:
thanks a lot, do you know how to get
their red, green, blue values (0-255)
for the basic palette, try the r.colors.out in newer versions of
GRASS.
or create 3 new maps with r.mapcalc's # operator, then r.out.xyz
for those:
r.mapcalc map.red = r#map
r.mapcalc map.green = g#map
r.mapcalc map.blue = b#map
Hamish
sarthakahuja wrote:
I am trying to export an image to an
excel file having lat, long, rgb values
for all the points on the image.
by the way, you'll want to use a very small region or very new
64bit version of Excel or else it won't accept the many rows
which a dump of a raster image creates.
big matrix datasets is why Matlab/Octave/Scilab (& raster GIS) was
invented 
Hamish
Hamish wrote:
r.mapcalc map.red = r#map
r.mapcalc map.green = g#map
r.mapcalc map.blue = b#map
This:
r.mapcalc "map.red = r#map ; map.green = g#map ; map.blue = b#map"
is more efficient, as it only reads the input map once.
--
Glynn Clements <glynn@gclements.plus.com>
Is this possible using grass jni. I looked into its library but could not
find functions for these commands
http://sorokine.info/grass-jni/htmls/index.html
If not, is there another way I could do this using java
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On Fri, Sep 23, 2011 at 5:49 PM, sarthakahuja <sarthakahuja@gmail.com> wrote:
Is this possible using grass jni. I looked into its library but could not
find functions for these commands
See http://sorokine.info/grass-jni/ - it is there only for historical reasons.
If not, is there another way I could do this using java
Perhaps through jython in order to use the nice new Python bindings?
Of course also via the new vtk-grass-bridge with JAVA bindings.
See also
http://grass.osgeo.org/wiki/GRASS_and_Java
Markus