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" <[email protected]>
Gesendet: 19.01.2011 01:33:43
An: "anna auge" <[email protected]>
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 <[email protected]> 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
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