So, as far as I understand:
GDAL can reference image with geos projection like
+proj=geos +lon_0=42 +h=35785831 +datum=WGS84
GDAL can put GeoTransformation information like
-a_ullr -924124.2 5421728.5 4179561.6 3468466.1
I guess this is related to maxium / minimum latitude and longitude seen from
satellite position.
*But I'm still wondering if someone success to reproject an image from
geostationnary projection to regular lat/lon ?*
Thanks,
Stéphane
2010/3/2 Frank Warmerdam <warmer...@pobox.com>
> Stéphane wrote:
>
>> Hi,
>>
>> Does anyone know if Gdal, current version or development version, is able
>> to translate from Geostationnary projection to other regular projection ?
>>
>> Is it planned in future Gdal release ?
>>
>
> Stéphane,
>
> I can confirm that GDAL/OGR supports the geostationary projection
> (+proj=geos in PROJ.4). You can specify the +proj=geos projection
> strings with GDAL where it would normally accept proj.4 strings.
> I see it translates:
>
> +proj=geos +lon_0=42 +h=35785831 +datum=WGS84
>
> as:
>
> PROJCS["unnamed",
> GEOGCS["WGS 84",
> DATUM["WGS_1984",
> SPHEROID["WGS 84",6378137,298.257223563,
> AUTHORITY["EPSG","7030"]],
> TOWGS84[0,0,0,0,0,0,0],
> AUTHORITY["EPSG","6326"]],
> PRIMEM["Greenwich",0,
> AUTHORITY["EPSG","8901"]],
> UNIT["degree",0.0174532925199433,
> AUTHORITY["EPSG","9108"]],
> AUTHORITY["EPSG","4326"]],
> PROJECTION["Geostationary_Satellite"],
> PARAMETER["central_meridian",42],
> PARAMETER["satellite_height",35785831],
> PARAMETER["false_easting",0],
> PARAMETER["false_northing",0]]
>
> I do not know how you would construct the geotransform
> for an arbitrary satellite image though.
>
> Best regards,
>
>
>> 2010/3/2 António Rocha <antonio.ro...@deimos.com.pt <mailto:
>> antonio.ro...@deimos.com.pt>>
>>
>> Hi Stéphane
>>
>> According to http://www.gdal.org/gdal_translate.html
>>
>> *-a_ullr* /ulx uly lrx lry/:
>> Assign/override the georeferenced bounds of the output file. This
>> assigns georeferenced bounds to the output file, ignoring what would
>> have been derived from the source file.
>> Yes... Regarding extracting sub-domains, I didn't tried
>>
>> Yes, please keep me in touch in case there are better methods
>>
>> Antonio
>>
>>
>> Stéphane wrote:
>>
>> Thanks for feedback !
>>
>> Do you have any ideas of the meaning of -a_ullr arguments they
>> gave you ?
>>
>> Futhermore, once you get your GeoTiff file, did you success to
>> translate it to other projection, or extracting sub domains ?
>>
>> I've heard that GEOS projection is not so really supported
>> currently by GDAL, and re-projection / sub domain extraction
>> doesn't work correctly ...
>>
>> I'll keep you in touch if any news !
>> Stéphane
>>
>> 2010/3/2 António Rocha <antonio.ro...@deimos.com.pt
>> <mailto:antonio.ro...@deimos.com.pt>
>> <mailto:antonio.ro...@deimos.com.pt
>> <mailto:antonio.ro...@deimos.com.pt>>>
>>
>>
>> Greetings
>>
>> I had exacly the same problem. I have been using LSASAF data
>> (from
>> MSG-2nd Generation satellites) that provides LST and FVC in HDF5
>> files. For some technical reason they are not goerreferenced and
>> their information.
>>
>> I talked with a few ILWIS software developers and they gave the
>> following Commands (adapted to my spatial coverage images):
>>
>> gdal_translate -a_srs "+proj=geos +lon_0=0.0 +h=35785831
>> +x_0=0.0
>> +y_0=0.0" -a_ullr -924124.2 5421728.5 4179561.6 3468466.1
>> "HDF5:"HDF5_LSASAF_MSG_LST_Euro_200802170100"://LST"
>> "euro_area_georeferenced.tif"
>>
>>
>> gdalwarp -s_srs "+proj=geos +lon_0=0.0 +h=35785831 +x_0=0.0
>> +y_0=0.0" -t_srs "+proj=latlong" "euro_area_georeferenced.tif"
>> "euro_area_latlong.tif"
>>
>> My HDF5 file doesn't contain any infoprmation regarding GEOS
>> projection. So, I had to do this
>>
>>
>> Hope this helps
>>
>> If you get any news/information/method regarding this, please
>> let
>> me know
>>
>> Best regards
>> Antonio
>>
>>
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>
>
> --
>
> ---------------------------------------+--------------------------------------
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> warmer...@pobox.com
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