<div dir="ltr">Hi Even,<div><br></div><div>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.<br></div><div><br></div><div>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?</div><div><br></div><div>Thanks again,</div><div>carl</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Aug 21, 2021 at 12:33 AM Even Rouault <<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>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.<br>
</p>
<div>Le 21/08/2021 à 03:36, Carl Godkin a
écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi,
<div>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.</div>
<div><br>
</div>
<div>These two command lines are exactly the same except that
the failing case has a smaller area:</div>
<div><br>
</div>
<div>gdal_translate "<a href="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" target="_blank">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</a>"
wms.xml -of WMS<br>
</div>
<div><br>
</div>
<div>gdal_translate \<br>
-projwin 524136.39 5229915.17 527111.89 5226499.96 \<br>
-projwin_srs EPSG:32610 \<br>
-outsize 2500 0 \<br>
wms.xml fails.tif<br>
<br>
gdal_translate \<br>
-projwin 517947.80 5235658.96 528189.82 5224344.74 \<br>
-projwin_srs EPSG:32610 \<br>
-outsize 2500 0 \<br>
wms.xml works.tif<br>
</div>
<div><br>
</div>
<div>Can anyone explain what's going on here and (most likely!)
what I'm doing wrong?</div>
<div><br>
</div>
<div>Thank you very much,</div>
<div><br>
</div>
<div>carl</div>
</div>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
gdal-dev mailing list
<a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a>
<a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a>
</pre>
</blockquote>
<pre cols="72">--
<a href="http://www.spatialys.com" target="_blank">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
</div>
</blockquote></div>