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Anna,<br>
<br>
I wonder how ENVI does the warping and if there isn't any hidden
trick that must be applied. I did the warping in Mirone where I can
choose to do a gdalwarp or warping using a totally independent code
(from Matlab) and the results are equal and ... wrong.<br>
<br>
Joaquim<br>
<br>
<blockquote
cite="mid:337649361.4308538.1296234450867.JavaMail.fmail@mwmweb078"
type="cite"><span style="font-size: 9pt;"><span
style="font-family: verdana,geneva;"><span
style="background-color: transparent;"><span style="color:
rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);"><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><a class="moz-txt-link-freetext" href="http://www.gdal.org/frmt_hdf4.html">http://www.gdal.org/frmt_hdf4.html</a>.<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: rgb(0, 0, 0);"><span style="color: rgb(0, 0,
0);"><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:
rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);">
<blockquote style="border-left: 2px solid blue;
margin-left: 5px; padding-left: 5px; padding-top:
5px;">
<hr>
<b>Von:</b> "Chaitanya kumar CH"
<a class="moz-txt-link-rfc2396E" href="mailto:chaitanya.ch@gmail.com"><chaitanya.ch@gmail.com></a><br>
<b>Gesendet:</b> 19.01.2011 10:13:49<br>
<b>An:</b> "anna auge" <a class="moz-txt-link-rfc2396E" href="mailto:annaauge@web.de"><annaauge@web.de></a><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 moz-do-not-send="true"
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 moz-do-not-send="true"
href="mailto:annaauge@web.de">annaauge@web.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt
0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
204, 204); padding-left: 1ex;">
<div>
<div align="left"><span></span> </div>
<div align="left"><span><span
style="font-family: Arial; color: rgb(0,
0, 255); 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: rgb(0, 0, 255);"><span
style="font-size: x-small;">Cheers, Anna</span></span></span></div>
<span style="font-size: 9pt;"><span
style="font-family: verdana,geneva;"><span
style="background-color: transparent;"><span
style="color: rgb(0, 0, 0);"><span
style="color: rgb(0, 0, 0);"></span></span></span></span></span><span
style="font-size: 9pt;"><span
style="font-family: verdana,geneva;"><span
style="background-color: transparent;"><span
style="color: rgb(0, 0, 0);"><span
style="color: rgb(0, 0, 0);"><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: rgb(0, 0, 0);"><span
style="color: rgb(0, 0, 0);">
<blockquote style="border-left: 2px
solid blue; margin-left: 5px;
padding-left: 5px; padding-top:
5px;">
<hr>
<b>Von:</b> "Nikolaos Hatzopoulos"
<<a moz-do-not-send="true"
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
moz-do-not-send="true"
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
<div>
<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
moz-do-not-send="true"
href="mailto:annaauge@web.de"
target="_blank">annaauge@web.de</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px
solid rgb(204, 204, 204);
padding-left: 1ex;">
<div
style="background-repeat:
repeat; background-color:
rgb(255, 255, 255); color:
rgb(0, 0, 0); font-family:
verdana,geneva; font-size:
9pt; padding-left: 0px;">
<div style="min-height:
200px;
background-repeat:
repeat;
background-color:
rgb(255, 255, 255);
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:
rgb(0, 0, 0);"><span
style="color:
rgb(0, 0, 0);"></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
moz-do-not-send="true"
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
moz-do-not-send="true"
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
moz-do-not-send="true"
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
moz-do-not-send="true"
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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-- <br>
Best regards,<br>
Chaitanya kumar CH.<br>
/tʃaɪθənjə/ /kʊmɑr/ <br>
+91-9494447584<br>
17.2416N 80.1426E<br>
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