Using gdalwarp (GDAL version 1.6) at the command line. Input: 8-bit color imagery NITF in geographic projection, pixel sizes of 4.4956841432e-06 degrees and 4.8692867036e-06 degrees, or very nearly 0.50 meters per pixel. Output: intended to be EPSG 3785 at the specified Level 19 pixelsize, which is 0.2986 m/pixel.
So there is some upsampling involved. I expected outputsize-pixels to be [inputsize-pixels * 0.50/0.2986] in both directions, but it is a good bit bigger than that. Can anybody see why ? Below is the input & output sizes, and the exact command used. Input size X, Y (pixels) : 45974, 39526 Output size X, Y (pixels) : 83468, 72894 Command used: gdalwarp -co tiled=yes -r bilinear -t_srs EPSG:3785 -tr 0.2986 0.2986 --config GDAL_CACHEMAX 800 input.ntf output.tif PS I'd like to query the output file to learn the pixel sizes, but gdalinfo doesn't give that for some reason. Can anyone suggest a means to query that info in a BigTIFF ? ......................................................... Jay Jennings Senior Software Engineer www.geoeye.com<http://www.geoeye.com> 703.480.4614 [email protected] 21700 Atlantic Blvd. Dulles, VA 20166 [cid:[email protected]]<http://www.geoeye.com/CorpSite> Trusted Imagery Experts
<<inline: image001.png>>
_______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
