[gdal-dev] Satellite projections

[Jerl Simpson]

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> 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 [gdal-dev-bounces at lists.osgeo.org]
> på vegne af Jerl Simpson [jsimpson at wxtrends.com]
> *Sendt:* 28. oktober 2013 16:17
> *Til:* 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

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