On Mon, 31 May 2010, Kim Besson wrote:
Greetings
Following a few suggestions made at this list I'm using gdalwarp to project
a few landsat images and only then yusing r.in.gdal.
I'm using this expression to reproject image:
gdalwarp -t_srs "+proj=tmerc +lat_0=39.66825833333333
+lon_0=-8.133108333333334 +k=1 +x_0=0 +y_0=0 +ellps=GRS80 +units=m +no_defs
" L71203033_03320001023_B10.TIF landsat_out.tif
And when I run r.in.gdal I get this warning:
Datum <unknown> not recognised by GRASS and no parameters found
Projection of input dataset and current location appear to match
What does this means?
It is a warning that there is no datum information in the reprojected
file. It may not be a problem, unless if the original image (before you
reprojected it) was in a different datum there could be small errors in
it. Since the ellipsoid is GRS80, you can add the correct datum
information by adding "+towgs84=0,0,0" to the projection parameters. If
you import that image with r.in.gdal then there should be no warning.
Paul
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