<div dir="ltr">Hi Jukka,<div><br></div><div>That's very interesting. Thanks a lot. I wonder if I can figure out how the X dimension is being changed to (or interpreted as) such a large range.</div><div><br></div><div>Certainly something that I can dig into step by step. </div><div><br></div><div>I can try sending your findings along to the USGS and hope that someone there takes an interest. This is a potentially very useful facility and I would be surprised if no one else had tried using GDAL tools with it!</div><div><br></div><div>Thanks again,</div><div><br></div><div>carl</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 1, 2020 at 11:37 PM jratike80 <<a href="mailto:jukka.rahkonen@maanmittauslaitos.fi">jukka.rahkonen@maanmittauslaitos.fi</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">Hi,<br>
<br>
By adding "-- debug on" into your command it is possible to get details<br>
about what GDAL is doing. Here are the main parts from the log<br>
<br>
gdal_translate<br>
"WCS:<a href="https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation" rel="noreferrer" target="_blank">https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation</a>"<br>
test.tif -projwin -107.03 37.28 -107 37.25 -projwin_srs EPSG:4326 -tr 100<br>
100 --debug on<br>
<br>
GDAL:<br>
GDALOpen(WCS:<a href="https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation" rel="noreferrer" target="_blank">https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation</a>,<br>
this=000002944175BD50) succeeds as WCS.<br>
GDAL: Using GTiff driver<br>
Input file size is 40075015, 20498394<br>
GDAL: Using GTiff driver<br>
0GDAL: GDAL_CACHEMAX = 1632 MB<br>
GDAL: GDALDatasetCopyWholeRaster(): 33*42 swaths, bInterleave=0<br>
WCS: DirectRasterIO(8122982,14330794,3340,4196) -> (33,42) (1 bands)<br>
<br>
WCS: Requesting<br>
<a href="https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?SERVICE=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=DEP3Elevation&SUBSET=x%28-20037507.0672000013,-11911185.14836644%29&SUBSET=y%284474012.1150791775,4478208.115037268%29&SCALESIZE=x%2833%29,y%2842%29&Format=image/tiff" rel="noreferrer" target="_blank">https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?SERVICE=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=DEP3Elevation&SUBSET=x%28-20037507.0672000013,-11911185.14836644%29&SUBSET=y%284474012.1150791775,4478208.115037268%29&SCALESIZE=x%2833%29,y%2842%29&Format=image/tiff</a><br>
HTTP:<br>
Fetch(<a href="https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?SERVICE=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=DEP3Elevation&SUBSET=x%28-20037507.0672000013,-11911185.14836644%29&SUBSET=y%284474012.1150791775,4478208.115037268%29&SCALESIZE=x%2833%29,y%2842%29&Format=image/tiff" rel="noreferrer" target="_blank">https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?SERVICE=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=DEP3Elevation&SUBSET=x%28-20037507.0672000013,-11911185.14836644%29&SUBSET=y%284474012.1150791775,4478208.115037268%29&SCALESIZE=x%2833%29,y%2842%29&Format=image/tiff</a>)<br>
HTTP: libcurl/7.70.0-DEV OpenSSL/1.1.1g zlib/1.2.3<br>
WCS: GDALOpenResult() on content-type: multipart/related; boundary="wcs";<br>
start="GML-Part"; type="text/xml"<br>
GDAL: GDALOpen(/vsimem/wcs/000002944175BD50/wcsresult.dat,<br>
this=0000029441C0D9A0) succeeds as GTiff.<br>
GDAL: GDALClose(/vsimem/wcs/000002944175BD50/wcsresult.dat,<br>
this=0000029441C0D9A0)<br>
...10...20...30...40...50...60...70...80...90...100 - done.<br>
GDAL: Flushing dirty blocks:<br>
0...10...20...30...40...50...60...70...80...90...100 - done.<br>
<br>
Image test.tif looks somehow corrupted from the right side.<br>
The only WCS request that GDAL sends can be found from the log. I removed<br>
url-encoding for clarity<br>
<br>
<a href="https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?SERVICE=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=DEP3Elevation&SUBSET=x(-20037507.0672000013,-11911185.14836644)&SUBSET=y(4474012.1150791775,4478208.115037268)&SCALESIZE=x(33),y(42)&Format=image/tiff" rel="noreferrer" target="_blank">https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?SERVICE=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=DEP3Elevation&SUBSET=x(-20037507.0672000013,-11911185.14836644)&SUBSET=y(4474012.1150791775,4478208.115037268)&SCALESIZE=x(33),y(42)&Format=image/tiff</a><br>
<br>
Unfortunately the server returns the GeoTIFF within a multipart content with<br>
some GML. I do not know how to extract the GeoTIFF from the multipart<br>
package so I could compare the results obtained by using WCS service<br>
directly with curl or a browser. But because GDAL does not do much for the<br>
result, just extract the tiff part and write it into separate GeoTIFF, I<br>
suppose that it is the WCS server that generates the corrupted output.<br>
However, the request that GDAL sends feels odd to me. Compare the projwin in<br>
gdal_translate command with subsets in the GetCoverage<br>
<br>
-projwin -107.03 37.28 -107 37.25<br>
SUBSET=x(-20037507.0672000013,-11911185.14836644)<br>
SUBSET=y(4474012.1150791775,4478208.115037268)<br>
<br>
Subract the numbers and notice that subset x is 8126321.919 meters while<br>
subset y is 4196 meters. <br>
I can see number 4196 also in this line of the log<br>
WCS: DirectRasterIO(8122982,14330794,3340,4196) -> (33,42) (1 bands)<br>
<br>
Perhaps the meaning is to create SUBSET=x() so that it is 3340 meters wide,<br>
not 8126322? And maybe the ESRI WCS server creates a corrupted tiff when it<br>
receives a somewhat lunatic request?<br>
<br>
-Jukka Rahkonen-<br>
<br>
<br>
<br>
<br>
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<br>
--<br>
Sent from: <a href="http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html" rel="noreferrer" target="_blank">http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html</a><br>
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