Anna, Check a couple of GCPs to rule out bad data. If they are OK, file a ticket at http://trac.osgeo.org/gdal/newticket
On Wed, Jan 19, 2011 at 1:23 PM, anna auge <annaa...@web.de> wrote: > > So it is a problem with gdalwarp and the GCPs ín the GeoTiff. Do you have > any hints how to go on with this problem? > Cheers, Anna > > ------------------------------ > *Von:* "Nikolaos Hatzopoulos" <nhat...@gmail.com> > *Gesendet:* 19.01.2011 01:33:43 > *An:* "anna auge" <annaa...@web.de> > *Betreff:* Re: [gdal-dev] Modis L1B SWATH: georef problem hdf to geotiff > > > 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*<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 >> > > > > NEU: FreePhone - kostenlos mobil telefonieren und surfen! > Jetzt informieren: > *http://produkte.web.de/go/webdefreephone*<http://produkte.web.de/go/webdefreephone> > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E
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