[gdal-dev] GOES-16 Projection Issue

[Simon Proud]

Hello,
I am trying to visualise GOES-16 data, but the output projection from 
gdal_translate appears faulty.
This is the command I use:
gdal_translate -a_srs "+proj=geos +a=6378137. +units=m +no_defs 
+b=6356752.31414 +x_0=0.0 +y_0=0.0 +ellps=GRS80 +lon_0=-75.0 
+f=.00335281068119356027 +h=35786023. +sweep=x" -a_ullr $ulx $uly $lrx 
$lry [input_file] [output_file]

For East Coast USA the results look fine, the output image matches a 
coastline shapefile. However, for the West coast the shapefile and image 
appear offset by tens of km. The problem is even worse on the East side 
of the image (West Africa). An example is available here: 
https://www2.physics.ox.ac.uk/sites/default/files/profiles/proud/goesr-proj-42831.png 


I've also tried without +f, without +sweep=x, with various difference +a 
and +b values and with different +ellps settings. All result in a 
problematic projection.

Any ideas what is happened? I've already asked NOAA about this, their 
tool (WCT) displays the projection properly. GDAL and NASA's panoply 
tool do not.

All the best,
Simon

-- 
Dr Simon R Proud
NERC Post-doctoral fellow in Aviation Meteorology,
Department of Atmospheric, Oceanic and Planetary Physics,
University of Oxford,
Clarendon Lab,
Parks Road,
OX1 3PU,
Oxford,
UK

Tel (office): +44 (0) 1865 282431
Tel (mobile): +44 (0) 7563 639685
Email: simon.proud at physics.ox.ac.uk
Twitter: @simon_sat
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