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

[Chaitanya kumar CH]

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 <annaauge at 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" <nhatzop at gmail.com>
> *Gesendet:* 19.01.2011 01:33:43
> *An:* "anna auge" <annaauge at 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 <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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>
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-- 
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E
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