[gdal-dev] Satellite projections

[Jerl Simpson]

Thanks again Simon.

Your information helped me find this:
http://www.remotesensing.org/geotiff/proj_list/geos.html

Jerl




On Mon, Oct 28, 2013 at 10:46 AM, Simon Richard Proud <srp at geo.ku.dk> wrote:

>  Oops, sorry! I forgot to include the -a_ullr variables. I have:
> up_left_x=-5570248.832537
> up_left_y=5570244.832537
> low_rig_x=5567248.429179
> low_rig_y=-5567252.429179
>
>  That should cover the full disk and seems to work with all satellites -
> you just need to vary the longitude to change between GOES/MSG/MTSAT etc.
> Cheers,
> Simon
>
>  ------------------------------
> *Fra:* Jerl Simpson [jsimpson at wxtrends.com]
> *Sendt:* 28. oktober 2013 16:41
> *Til:* Simon Richard Proud
> *Cc:* gdal-dev at lists.osgeo.org
> *Emne:* Re: [gdal-dev] Satellite projections
>
>   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
>
> Corporate – http://www.wxtrends.com****
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>
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>


-- 

Jerl Simpson

Sr. Systems Engineer

Weather Trends International

jsimpson at wxtrends.com

Corporate – http://www.wxtrends.com****

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**

This communication is privileged and may contain confidential information.
It's intended only for the use of the person or entity named above. If you
are not the intended recipient, do not distribute or copy this
communication. If you have received this communication in error, please
notify the sender immediately and return the original to the email address
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