<body><span style="font-size: 9pt;"><span style="font-family: verdana,geneva;"><span style="background-color: transparent;"><span style="color: #000000;"><span style="color: #000000;"><br />hi all,<br />excuse me for not giving up. i undertook some additional tests, and i got the same problems i described below. But i can't believe that nobody is working with gdal and modis level 1b data. At least this format is listet as supported at </span></span></span></span></span>http://www.gdal.org/frmt_hdf4.html.<br />So my question: does anybody in this list work with modis level 1b? If yes, is the georeference of the resulting image ok or does somebody knows an workaround?<br />maybe the answer is, that it is not possible to warp modis level 1b data with gdal because the modis geolocation (mod3xxx) file is missing?<br />i appreciate any help.<br />cheers<br />anna<br /><span style="font-size: 9pt;"><span style="font-family: verdana,geneva;"><span style="background-color: transparent;"><span style="color: #000000;"><span style="color: #000000;"><br /></span></span></span></span></span><span style="font-size: 9pt;"><span style="font-family: verdana,geneva;"><span style="background-color: transparent;"><span style="color: #000000;"><span style="color: #000000;">
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<b>Von:</b> "Chaitanya kumar CH" <chaitanya.ch@gmail.com><br /><b>Gesendet:</b> 19.01.2011 10:13:49<br /><b>An:</b> "anna auge" <annaauge@web.de><br /><b>Betreff:</b> Re: [gdal-dev] Modis L1B SWATH: georef problem hdf to geotiff<br /><br />Anna,<br /><br />Check a couple of GCPs to rule out bad data. If they are OK, file a ticket at <a href="http://trac.osgeo.org/gdal/newticket">http://trac.osgeo.org/gdal/newticket</a><br /><br />
<div class="gmail_quote">On Wed, Jan 19, 2011 at 1:23 PM, anna auge <span><<a href="mailto:annaauge@web.de">annaauge@web.de</a>></span> wrote:<br />
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<div align="left"><span><span style="font-family: Arial; color: #0000ff; font-size: x-small;">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? </span></span></div>
<div><span></span><span style="font-family: Arial;"><span style="color: #0000ff;"><span style="font-size: x-small;">Cheers, Anna</span></span></span></div>
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<b>Von:</b> "Nikolaos Hatzopoulos" <<a href="mailto:nhatzop@gmail.com" target="_blank">nhatzop@gmail.com</a>><br /><b>Gesendet:</b> 19.01.2011 01:33:43<br /><b>An:</b> "anna auge" <<a href="mailto:annaauge@web.de" target="_blank">annaauge@web.de</a>><br /><b>Betreff:</b> Re: [gdal-dev] Modis L1B SWATH: georef problem hdf to geotiff
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<div class="h5"><br /><br />You are right, I notice that there isn't any difference from the<br />band_1.tiff and band_1_warp.tiff<br /><br />--Nikos Hatzopoulos<br /><br />
<div class="gmail_quote">On Mon, Jan 17, 2011 at 8:15 AM, anna auge <span><<a href="mailto:annaauge@web.de" target="_blank">annaauge@web.de</a>></span> wrote:<br />
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<div style="min-height: 200px; background-repeat: repeat; background-color: #ffffff; font-family: verdana,geneva; font-size: 9pt; padding-left: 0px;"><span style="font-size: 9pt;"><span style="font-family: verdana,geneva;"><span style="background-color: transparent;"><span style="color: #000000;"><span style="color: #000000;"></span></span></span></span></span>Hi all,<br /><br />I am trying to convert modis level 1B data (type SWATH) to geotiff following these steps.<br /><br />1) Examining the HDF<br />gdalinfo d:\modis\1b\MOD021KM.A2011008.0850.005.2011008195744.hdf<br />gdalinfo HDF4_EOS:EOS_SWATH:"d:\modis\1b\MOD021KM.A2011008.0850.005.2011008195744.hdf":MODIS_SWATH_Type_L1B:EV_1KM_RefSB<br /> 2) Extracting the 1. band of the subdataset MODIS_SWATH_Type_L1B:EV_1KM_RefSB<br />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<br /> 4) Warping the image to WGS84<br />gdalwarp -t_srs EPSG:4326 d:\modis\1b\band_1.tiff d:\modis\1b\band_1_warp.tiff<br /><br />The example dataset, which i am using, can be downloaded here<br /><a href="ftp://ladsftp.nascom.nasa.gov/allData/5/MOD021KM/2011/008//MOD021KM.A2011008.0850.005.2011008195744.hdf" target="_blank">ftp://ladsftp.nascom.nasa.gov/allData/5/MOD021KM/2011/008//MOD021KM.A2011008.0850.005.2011008195744.hdf</a><br /><br />And now to my problem: I get always an certain shift (<a href="http://www.flickr.com/photos/54033867@N00/5363471425/in/photostream/" target="_blank">http://www.flickr.com/photos/54033867@N00/5363471425/in/photostream/</a>), which is avoided if i am using the "Georeference MODIS" option in ENVI (<a href="http://www.flickr.com/photos/54033867@N00/5364083966/in/photostream/" target="_blank">http://www.flickr.com/photos/54033867@N00/5364083966/in/photostream/</a>).<br /> I also tried a few workarounds, f.g. <a href="http://thread.gmane.org/gmane.comp.gis.gdal.devel/10482" target="_blank">http://thread.gmane.org/gmane.comp.gis.gdal.devel/10482</a>, but nothing worked properly.<br />As far as I understand gdal supports Modis L1B SWATH, so what I am doing wrong? Any help is appreciated.<br /><br />Regards Anna<br /><br />P.S. I am using FWTools 2.4.7 on Windows</div>
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