[gdal-dev] Puzzled about gdal_translate return all white image...

[Carl Godkin]

Hi Even,

Thank you for the reply.  It occurred to me that the server might be
missing the data.  I changed my little script to use "-outsize 2000 0" and
it works fine.

Is there any way to check for this or protect against it  from the client
side, or do you just have to be experienced with a given WMS service?

Thanks again,
carl

On Sat, Aug 21, 2021 at 12:33 AM Even Rouault <even.rouault at spatialys.com>
wrote:

> Nothing wrong from your side, but the second command probably selects a
> higher zoom level that has blank data given the configuration/data
> available on the server side.
> Le 21/08/2021 à 03:36, Carl Godkin a écrit :
>
> Hi,
> I'm very puzzled about why gdal_translate (v. 3.3.1) returns an all-white
> image when I select a smaller area than with a working case with a larger
> area.
>
> These two command lines are exactly the same except that the failing case
> has a smaller area:
>
> gdal_translate "
> https://basemap.nationalmap.gov:443/arcgis/services/USGSImageryTopo/MapServer/WmsServer?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&LAYERS=0&SRS=EPSG:4326&BBOX=-179.999989,-89.000000,179.999988,89.000000"
> wms.xml -of WMS
>
> gdal_translate \
>     -projwin 524136.39 5229915.17 527111.89 5226499.96 \
>     -projwin_srs EPSG:32610 \
>     -outsize 2500 0 \
>     wms.xml fails.tif
>
> gdal_translate \
>     -projwin 517947.80 5235658.96 528189.82 5224344.74 \
>     -projwin_srs EPSG:32610 \
>     -outsize 2500 0 \
>     wms.xml works.tif
>
> Can anyone explain what's going on here and (most likely!) what I'm doing
> wrong?
>
> Thank you very much,
>
> carl
>
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>
>
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