[gdal-dev] Modis L1B SWATH: georef problem hdf to geotiff

[Nikolaos Hatzopoulos]

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 <annaauge at 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
>
>
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