Hello,
I'm running into some problems warping to gnomonic projection. I'm trying to
warp a TIFF in azimuthal-equidistant projection (covering North America,
including the north pole and centered on 46°N, 95°W) to gnomonic. These are the
relevant details and coverage of the input TIFF:
http://dpaste.com/hold/372063/
Here's what I'm trying:
gdalwarp -t_srs "+proj=gnom +lat_0=0 +lon_0=0" -te -6378137 -6378137
6378137 6378137 -ts 512 512 NAPHY_r-latlon.tif NAPHY_r-gnom.tif
Here's what I'm seeing:
ERROR 1: tolerance condition error
ERROR 1: tolerance condition error
...
ERROR 1: tolerance condition error
ERROR 1: Reprojection failed, err = -20, further errors will be
supressed on the transform object.
The output looks to be a black square. I've successfully reprojected this same
input TIFF to both spherical mercator and latlon, so I tried converting to one
of those first and then gnomonic second, but still got the same errors. For
what it's worth, the geographic info for the projected all-black TIFF looks
right:
http://dpaste.com/hold/372080/
I found this from six years ago and tried adding the recommended -wo
SOURCE_EXTRA=100 -wo SAMPLE_GRID=YES parameters to gdalwarp, but I'm still
seeing the same tolerance condition errors:
http://trac.osgeo.org/gdal/ticket/642
Any ideas?
-mike.
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michal migurski- m...@stamen.com
415.558.1610
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