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 <[email protected]
<mailto:[email protected]>> 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:* [email protected]
<mailto:[email protected]>
[[email protected]
<mailto:[email protected]>] på vegne af Jerl
Simpson [[email protected] <mailto:[email protected]>]
*Sendt:* 28. oktober 2013 16:17
*Til:* [email protected] <mailto:[email protected]>
*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
[email protected] <mailto:[email protected]>
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