[gdal-dev] Experiences with the WMS driver

[Momtchil Momtchev]

     You can get the raw image with curl (it is just a static image):

$ curl "https://svs.gsfc.nasa.gov/cgi-bin/wms?SERVICE=WMS&request=GetMap&version=1.3.0&layers=3170_21483_bg&styles=&format=image/png&bbox=-180,-90,180,90&crs=CRS:84&transparent=FALSE&width=922&height=461"  --output raw.png

     Then use gdal_translate to georeference it:

$ gdal_translate -a_srs CRS:84  -a_ullr -180 90 180 -90 raw.png out.png


On 03/01/2022 21:15, Joaquim Manuel Freire Luís wrote:
>
> Thanks. That’s right that modifying the host name prints the same size 
> info but there is nothing in the url that permits to estimate the 
> “Pixel Size”.
>
> Also, this not the main issue. The main one is when passing a valid 
> “GetMap” string that works in a browser but errors in gdal_translate.
>
> *From:*Momtchil Momtchev <momtchil at momtchev.com>
> *Sent:* Monday, January 3, 2022 3:08 PM
> *To:* gdal-dev at lists.osgeo.org; Joaquim Manuel Freire Luís <jluis at ualg.pt>
> *Subject:* Re: [gdal-dev] Experiences with the WMS driver
>
>     gdalinfo does not contact the remote server at all, it extracts 
> all the information it displays from the URL.
>
>     Try replacing the hostname with something invalid, keeping all the 
> parameters and you will still get the same output.
>
> On 01/01/2022 19:47, Joaquim Manuel Freire Luís wrote:
>
>     But if I do
>
>     gdalinfo
>     "WMS:http://svs.gsfc.nasa.gov/cgi-bin/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&LAYERS=3170_21483_bg&CRS=CRS:84&BBOX=-180.0,-90.0,180.0,90.0&TRANSPARENT=FALSE
>     <http://svs.gsfc.nasa.gov/cgi-bin/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&LAYERS=3170_21483_bg&CRS=CRS:84&BBOX=-180.0,-90.0,180.0,90.0&TRANSPARENT=FALSE>"
>
>     it seems to work but note the reported sizes and unreasonable
>     resolution.
>
>     Data axis to CRS axis mapping: 1,2
>
>     Origin = (-180.000000000000000,90.000000000000000)
>
>     Pixel Size = (0.000000335276127,-0.000000335276127)
>
>     Image Structure Metadata:
>
>       INTERLEAVE=PIXEL
>
>     Corner Coordinates:
>
>     Upper Left (-180.0000000,  90.0000000) (180d 0' 0.00"W, 90d 0' 0.00"N)
>
>     Lower Left (-180.0000000, -90.0000000) (180d 0' 0.00"W, 90d 0' 0.00"S)
>
>     Upper Right ( 180.0000000,  90.0000000) (180d 0' 0.00"E, 90d 0'
>     0.00"N)
>
>     Lower Right ( 180.0000000, -90.0000000) (180d 0' 0.00"E, 90d 0'
>     0.00"S)
>
>     Center      (   0.0000000,   0.0000000) (  0d 0' 0.01"E,  0d 0'
>     0.01"N)
>
>     Band 1 Block=1024x1024 Type=Byte, ColorInterp=Red
>
>       Overviews: 536870912x268435456, 268435456x134217728,
>     134217728x67108864, 67108864x33554432, 33554432x16777216,
>     16777216x8388608, 8388608x4194304, 4194304x2097152,
>     2097152x1048576, 1048576x524288, 524288x262144, 262144x131072,
>     131072x65536, 65536x32768, 32768x16384, 16384x8192, 8192x4096,
>     4096x2048, 2048x1024, 1024x512
>
> -- 
> Momtchil Momtchev<momtchil at momtchev.com>  <mailto:momtchil at momtchev.com>

-- 
Momtchil Momtchev <momtchil at momtchev.com>

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