[gdal-dev] Warping EUMetsat MSG-4 MPE dataset to webmercator projection

[Menno van Scheers - HUSS]

Yeah, I already tried warping with smaller target extends.
Im quiete certain earlier versions of gdal would throw tollerance condition errors, but would still warp.
With the current version it just wont.

Menno van Scheers

-----Original Message-----
From: gdal-dev [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Andre Joost
Sent: zaterdag 21 april 2018 19:28
To: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] Warping EUMetsat MSG-4 MPE dataset to webmercator projection

Am 20.04.18 um 22:10 schrieb Even Rouault:
> On jeudi 19 avril 2018 09:17:35 CEST Menno van Scheers - HUSS wrote:
>> Hi,
>>
>> Built version 2.2.4 of gdal with no additional libraries.
>> Currently trying to warp a grib dataset to webmercator projection 
>> with the following arguments : gdalwarp  -t_srs "+proj=geos +lon_0=0 
>> +h=35785831
>> +x_0=0 +y_0=0 +a=6378140 +b=6356755 +units=m +no_defs"
>> 201804181115_L-000-MSG4__-MPEF________-MPEG_____-000000___-201804181115-__.
>> grib webm.tiff
>>
>> This task fails with : ERROR 1: Too many points (5625 out of 5625) 
>> failed to transform, unable to compute output bounds.
>>
>> Source dataset has a geostationary projection Basic info on the 
>> dataset :
>>
>> PROJ.4 string is:
>> '+proj=geos +lon_0=0 +h=35785831 +x_0=0 +y_0=0 +a=6378140 +b=6356755
>> +units=m +no_defs ' Origin =
>> (-5570248.477582973428071,5570248.477582973428071)
>> Pixel Size = (3000.403165948275728,-3000.403165948275728)
>> Corner Coordinates:
>> Upper Left  (-5570248.478, 5570248.478) ERROR 1: tolerance condition 
>> error
>>
>> Lower Left  (-5570248.478,-5567248.074) ERROR 1: tolerance condition 
>> error
>>
>> Upper Right ( 5567248.074, 5570248.478) ERROR 1: tolerance condition 
>> error
>>
>> Lower Right ( 5567248.074,-5567248.074) ERROR 1: tolerance condition 
>> error
>>
>>
>> Example of the dataset :
>> https://hussbv-my.sharepoint.com/:u:/g/personal/menno_huss_nl/EQwTxBK
>> wPQlOjP Z_DZcuZWcBgBs0y96_9Vev3tIqnne3KA?e=k6hmYU
>
> Menno,
>
> Yes gdalwarp has a hard-time with such images since a lot of points in 
> them correspond to points not on the Earth surface...
> The workaround is to explicitly specify the target extent (in the 
> target SRS), so for full world
> coverage:
> -te -20037508.34 -20037508.34 20037508.34 20037508.34
>


I tried:
gdal_translate -a_srs "+proj=geos +h=35785831 +a=6378169 +b=6356583.8 
+no_defs" -b 1
201804181115_L-000-MSG4__-MPEF________-MPEG_____-000000___-201804181115-__.grib
temp.tif
gdalwarp -t_srs EPSG:3857 -te -20037508.34 -20037508.34 20037508.34
20037508.34 temp.tif output.tif

but still get the same too much points. Even with selecting a smaller target extent that should be within the visible sector.

Greetings,
Andre Joost


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