[GRASS-user] Copy raster from xy location to latlong

GRASS GRASS user
1

Thanks for responding.

I think I was a little unclear in my original description. My
xy-location raster is stored as pixel values (720 rows and 1440
columns, with the origin (0, 0) at the bottom left corner),
such that an individual pixel might have a coordinate of 125, 256.
I need to somehow "project" this xy location raster into a lat long location where
the coordinate values to each pixel are in lat-long coordinates (e.g.
0 degrees longitude, 0 degrees latitude is the center of the grid,
the left edge is at -180 degrees (West), and the north edge is at 90
degrees (North)). Since there are 720 rows, it is clear that each pixel
represents 1/4 of a degree (the satellite product has a global extent),
and the "re-projected" copy in the lat long location will have a resolution
of 1/4 degree. In essence, I need to somehow reassign coordinate values to each
pixel so they are in lat-long rather that pixel coordinates.

Thanks!

Bill

2

2008/8/6 William Hudspeth <bhudspeth@edac.unm.edu>:

Thanks for responding.

I think I was a little unclear in my original description. My
xy-location raster is stored as pixel values (720 rows and 1440
columns, with the origin (0, 0) at the bottom left corner),
such that an individual pixel might have a coordinate of 125, 256.
I need to somehow "project" this xy location raster into a lat long location where

well, r.in.gdal might do the trick.
it can even create a new location with the parameters specified in the
HDF header.

try gdalinfo to see if there's any projection info, then r.in.gdal
in=HDF_file out=rastername location=HDF_location

--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc