Monobakht, Probably due to the bow-tie effect of the MODIS scanning sensor. gdalwarp cannot currently deal with that correctly.
Discussed recently in this thread: http://osgeo-org.1560.x6.nabble.com/gdal-dev-gdalwarp-problems-with-MODIS-L1B-td5206583.html Best regards, Even > This question was posted originally at > http://gis.stackexchange.com/questions/154959/strange-effect-in-gdalwarp-ou > tput > <http://gis.stackexchange.com/questions/154959/strange-effect-in-gdalwarp- > output> but I did not get any helpful response. Here is the problem: > > I am using gdalwarp in python to extract and re-project reflectance bands > from MODIS level 1B (MOD021km). The command that I am using is the > following: > > / > gdalwarp -of GTIFF -tps -t_srs EPSG:4326 -tr 0.01 0.01 -r bilinear > -overwrite > HDF4_EOS:EOS_SWATH:"C:\tmp\MYD021KM.A2007094.0935.006.2012075055042.hdf":MO > DIS_SWATH_Type_L1B:EV_500_Aggr1km_RefSB C:\tmp\Output.tif > / > > It converts the hdf subdataset without any problem but the output file > seems to have some sort of artifact, specially close to the edges. (See > below) <http://osgeo-org.1560.x6.nabble.com/file/n5216470/gdalwarp.jpg> > > I converted the same data using Modis Conversion Toolkit (MCTK) and it > seems to be much better. (Below) > <http://osgeo-org.1560.x6.nabble.com/file/n5216470/MCTK.jpg> > > I tried different resampling method and different output projection but > still the same results! Is there anyone having this issue with gdalwarp? > > P.S. The data can be downloaded from this address: > ftp://ladsweb.nascom.nasa.gov/allData/6/MYD021KM/2007/094/MYD021KM.A2007094 > .0935.006.2012075055042.hdf > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/Strange-effect-in-gdalwarp-output-tp52 > 16470.html Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
