[gdal-dev] Satellite projections

Mon Oct 28 09:01:07 PDT 2013

Hi Reinoud:

I've had moderate success using the info and JAR file found here:
http://www.ssec.wisc.edu/visit/netcdf/

It converts the GOES East/West, MTSTAT, and METEOSAT data to netCDF.
I can then use gdaldem to get an image.  I'm working on assigning the SRS
info now, thanks to Simon's suggestions.

Jerl

On Mon, Oct 28, 2013 at 10:55 AM, Reinoud Bokhorst <
reinoud.bokhorst at bmtargoss.com> wrote:

>  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>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
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-- 

Jerl Simpson

Sr. Systems Engineer

Weather Trends International

jsimpson at wxtrends.com

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