[gdal-dev] Satellite projections

[Reinoud Bokhorst]

Dear Jerl, Simon,
Apologize for mixing into this thread but I am currently investigating 
how to process EUMETCAST data to more usuable formats like NetCDF and 
GeoTIFF.  The data stream contains MSG HRIT data and GOES15/17 + MTSAT2 
LRIT data. I'll also need to reproject like you do so this post already 
proves useful!

I can read the MSG data trough gdal/meteosatlib but I can't read the 
GOES and MTSAT2 LRIT data yet. Do you perhaps have some useful pointers 
to software to use? Online documentation is rather scarce...

Thanks Reinoud



On 10/28/2013 04:41 PM, Jerl Simpson wrote:
> Thanks Simon!
>
> I'll give it a shot.  Meteosat is definitely a pain, and it's one of 
> the satellites I'm working with.
>
> If you don't mind me asking, what do you typically have in your 
> -a_ullr designation for gdal_translate?  Or are you pulling out 
> sections and it varies?  I'd like to get the full image, if possible.
>
> Thanks again!
>
> Jerl
>
>
> On Mon, Oct 28, 2013 at 10:33 AM, Simon Richard Proud <srp at geo.ku.dk 
> <mailto:srp at geo.ku.dk>> wrote:
>
>     Hi Jerl,
>     We work with Meteosat data in full disk projection and it's a bit
>     of a headache! Try these commands in GDAL and see if they work for
>     you:
>
>     gdal_translate -a_srs  "+proj=geos +a=6378169 +b=6356583.8
>     +lon_0=9.49 +h=35785831" -a_ullr
>     $up_left_x $up_left_y $low_rig_x $low_rig_y $INFILE $TEMPFILE
>     gdalwarp -s_srs '+proj=geos +lon_0=9.49 +h=35785831 +x_0=0.0'
>     -t_srs '+proj=latlong +datum=WGS84' -tr 0.01 0.01 -te 0 20  70 70
>     -order 3 $TEMPFILE $OUTFILE
>
>     Just remember to change the +lon_0 to whatever you need for GOES.
>     Also change the -tr and -te for gdal :-) You can also add +lat_0
>     but to be honest I never found it made a difference (perhaps it is
>     ignored?)
>
>     Cheers,
>     Simon
>
>     ------------------------------------------------------------------------
>     *Fra:* gdal-dev-bounces at lists.osgeo.org
>     <mailto:gdal-dev-bounces at lists.osgeo.org>
>     [gdal-dev-bounces at lists.osgeo.org
>     <mailto:gdal-dev-bounces at lists.osgeo.org>] på vegne af Jerl
>     Simpson [jsimpson at wxtrends.com <mailto:jsimpson at wxtrends.com>]
>     *Sendt:* 28. oktober 2013 16:17
>     *Til:* gdal-dev at lists.osgeo.org <mailto:gdal-dev at lists.osgeo.org>
>     *Emne:* [gdal-dev] Satellite projections
>
>     Hi guys:
>
>     I have a few data sets that come from the GOES satellites (Full
>     Disk) and a couple others.  I can use one of the SSEC's programs
>     to convert from their format to a netCDF.  No useful SRS info
>     comes along in the conversion.
>
>     I've applied an SRS to them using gdal_translate and PROJ.4 that
>     looks like:
>
>     "+proj=ortho +lon_0=-79.8 +lat_0=.208"  (lon/lat is the position
>     of one of the satellites)
>
>     (I've also tried):
>     +proj=ortho +datum=WGS84 +ellps=WGS84 +lon_0=-79.8 +lat_0=.208
>
>     I'm wanting to get them into EPSG:4326.  When I do this, I end up
>     with corner coordinates of a very small area just below the
>     satellites position.
>
>     Does anyone have an suggestions that might help me warp this into
>     position?  I'm sure there's something obvious that I'm missing.
>     I found this page, and the copied/pasted bit about the projection,
>     but my attempts have not been successful.
>
>     http://www.gdal.org/frmt_msg.html
>     /Georeference and Projection/
>     /
>     /
>     /The images are using the Geostationary Satellite View projection.
>     Most GIS packages don't recognize this projection (we only know of
>     ILWIS that does have this projection), but gdalwarp.exe can be
>     used to re-project the images./
>     /
>     /
>     Thanks!
>
>
>
>
> -- 
>
> Jerl Simpson
>
> Sr. Systems Engineer
>
> Weather Trends International
>
> jsimpson at wxtrends.com <mailto:jsimpson at wxtrends.com>
>
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-- 
Reinoud Bokhorst
Advisor Oceanography & ICT
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