anna, Nikolaos, after much experimentation I found something that seems to work.
gdalwarp --config GEOL_AS_GCPS FULL \ -tps -geoloc -t_srs EPSG:4326 \ -te -119.88004906118 13.5092548294379 \ -92.6036641645677 34.7070050511582 \ HDF4_EOS:EOS_SWATH:"MOD02HKM.A2011169.1750.005.NRT.hdf":MODIS_SWATH_Type_L1B:EV_500_RefSB \ MOD02HKM.A2011169.1750.005.NRT.tif note i tried to escape the newlines to make it easy to read but the email may mess that up. there is about 2.7 million gcp's in a normal 5min modis swath file, by default gdal only reads every 10th row and column of gcp's this is not enough to handle the bowtie effect. Brian On Tue, 2011-01-18 at 16:33 -0800, Nikolaos Hatzopoulos wrote: > You are right, I notice that there isn't any difference from the > band_1.tiff and band_1_warp.tiff > > --Nikos Hatzopoulos > > On Mon, Jan 17, 2011 at 8:15 AM, anna auge <annaa...@web.de> wrote: > Hi all, > > I am trying to convert modis level 1B data (type SWATH) to > geotiff following these steps. > > 1) Examining the HDF > gdalinfo d:\modis\1b > \MOD021KM.A2011008.0850.005.2011008195744.hdf > gdalinfo HDF4_EOS:EOS_SWATH:"d:\modis\1b > > \MOD021KM.A2011008.0850.005.2011008195744.hdf":MODIS_SWATH_Type_L1B:EV_1KM_RefSB > 2) Extracting the 1. band of the subdataset > MODIS_SWATH_Type_L1B:EV_1KM_RefSB > gdal_translate -of GTiff -b 1 HDF4_EOS:EOS_SWATH:"d:\modis\1b > > \MOD021KM.A2011008.0850.005.2011008195744.hdf":MODIS_SWATH_Type_L1B:EV_1KM_RefSB > d:\modis\1b\band_1.tiff > 4) Warping the image to WGS84 > gdalwarp -t_srs EPSG:4326 d:\modis\1b\band_1.tiff d:\modis\1b > \band_1_warp.tiff > > The example dataset, which i am using, can be downloaded here > > ftp://ladsftp.nascom.nasa.gov/allData/5/MOD021KM/2011/008//MOD021KM.A2011008.0850.005.2011008195744.hdf > > And now to my problem: I get always an certain shift > > (http://www.flickr.com/photos/54033867@N00/5363471425/in/photostream/), which > is avoided if i am using the "Georeference MODIS" option in ENVI > (http://www.flickr.com/photos/54033867@N00/5364083966/in/photostream/). > I also tried a few workarounds, f.g. > http://thread.gmane.org/gmane.comp.gis.gdal.devel/10482, but > nothing worked properly. > As far as I understand gdal supports Modis L1B SWATH, so what > I am doing wrong? Any help is appreciated. > > Regards Anna > > P.S. I am using FWTools 2.4.7 on Windows > > > > WEB.DE DSL Doppel-Flat ab 19,99 €/mtl.! Jetzt mit > gratis Handy-Flat! > http://produkte.web.de/go/DSL_Doppel_Flatrate/2 > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev