To clarify: doing the gdalwarp resample without OpenCL is producing a realistic Float32 value range. Doing it WITH OpenCL is producing far higher values.
This is on a Tesla M2090. No other experiments/benchmarks have produced this kind of result, and as I wrote below, gdalwarp itself works when only doing reprojection, not resampling, regardless of whether OpenCL is used. Jonathan On 3/5/2016 7:06 PM, Jonathan Williams wrote: > Hello, > I've run into an odd problem that I suspect is the result of some > incorrect variable type casting, but I'm not sure where to look or how > to fix it. > > Inputting a raster in Float32 format (or Float64, with -ot Float32 > and/or -wt Float32 enabled on the command line) and attempting to do a > resample interpolation (doesn't seem to matter what OpenCL-compatible > algorithm) is producing output that is huge compared with the input. The > output still has a range of values, and it makes me wonder whether the > output is being multiplied by a very large amount at some point. > > Saga GIS reports the non-OpenCL resampled Float32 values as ranging from > -8.595017433166504 to 166.74661254882812, and the resampled values as > ranging from -340282346638528860000000000000000000000 to > 340282346638528860000000000000000000000 (+/- 3.4e38, e.g. the maximum > range of single precision floating point) > > Running the exact same warp with OpenCL disabled produces the correct > output. > > Here's an example of the gdalwarp runline: > > gdalwarp -srcnodata 9999 -dstnodata 9999 -wt Float32 -ot Float32 > --config GDAL_CACHEMAX 4096 -wm 2048 -multi -tr .03 .03 -r lanczos > --debug on -overwrite -wo "USE_OPENCL=TRUE" 373.grib2 373_res.tif > > I will note that the input file in this case is in Float64 format; > however, converting it to Float32 prior to the warp makes no difference. > Neither does whether the input file is in grib2 format or geotiff format. > > Reprojection-only operations produce normal-looking output using OpenCL. > > Best, > Jonathan > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
