[gdal-dev] gdallocationinfo + WCS question...

[Carl Godkin]

Hi again,

Like Jukka, I get a 404 from the National Map server.  (I kept removing the
cache directory just in case that mattered.)

I just asked a colleague in Texas to try the National Map WCS command and
it's not working for him either so Ari and Even are apparently lucky!

Thanks,
carl


On Thu, Oct 21, 2021 at 1:32 PM Rahkonen Jukka (MML) <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> Hi Even,
>
>
>
> You are right, re-running the request -oo clear_cache gives me the same
> error about 3 bands. Obviously our server was configured right when I used
> it with GDAL last time. Now gdallocationinfo does not work even for me
> because I wiped the working configuration from my cache. We will fix the
> service metadata when we go from beta to official soon.
>
>
>
> The nationalmap.gov service does not still work for me. I cleared the
> cache but I still get a 404 error from the server. Subsets in the reques
> are these
>
> SUBSET=x(-20037507.0672000013,-13590403.131594259)&SUBSET=y(5303978.1067894027,5304490.1067842878)
>
> and gdallocationinfo error is this:
>
>
>
> Report:
>
>   Location: (6446955P,13504941L)
>
>   Band 1:
>
> ERROR 1: HTTP error code : 404
>
> ERROR 1: Failed to get coverage data:
>
> ERROR 1: C:\Users\JRAHKONEN\.gdal\wcs_cache\QpYSX.xml, band 1: IReadBlock
> failed at X offset 6295, Y offset 26376: Failed to get coverage data:
>
>
>
> -Jukka-
>
>
>
> *Lähettäjä:* Even Rouault <even.rouault at spatialys.com>
> *Lähetetty:* torstai 21. lokakuuta 2021 22.50
> *Vastaanottaja:* Rahkonen Jukka (MML) <jukka.rahkonen at maanmittauslaitos.fi>;
> Carl Godkin <cgodkin at gmail.com>; gdal-dev at lists.osgeo.org
> *Aihe:* Re: [gdal-dev] gdallocationinfo + WCS question...
>
>
>
> Jukka,
>
> I don't understand how you get a non-error on the below request on your
> WCS service:
>
>
> https://beta-karttakuva.maanmittauslaitos.fi/wcs/service/ows?SERVICE=WCS&REQUEST=DescribeCoverage&VERSION=2.0.1&COVERAGEID=korkeusmalli__korkeusmalli&FORMAT=text/xml
> advertizes 3 bands
>
> but the GeoTIFF returned by
>
>
> https://beta-karttakuva.maanmittauslaitos.fi/wcs/service/ows?SERVICE=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=korkeusmalli__korkeusmalli&SUBSET=E%28498656,500704%29&SUBSET=N%287542384,7543408%29&Format=image/tiff
>
> has just one band.
>
> Or maybe you have in your ~/gdal/wcs_cache a previous version of the
> DescribeCoverage response that advertizes just one band ?
>
>
>
> And for what is worth,
>
> gdallocationinfo "WCS:
> https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation"
> -wgs84 -122.086 42.948 --debug ON
>
> returns 1882.00549316406 for me
>
> The multipart answer doesn't seem to be an issue.
>
>
>
> Le 21/10/2021 à 20:16, Rahkonen Jukka (MML) a écrit :
>
> Hi,
>
>
>
> At least it seems to work with our WCS service
>
> gdallocationinfo WCS:
> https://beta-karttakuva.maanmittauslaitos.fi/wcs/service/ows?version=2.0.1&coverage=korkeusmalli__korkeusmalli
> -wgs84 27 68
>
> Report:
>
>   Location: (228000P,119567L)
>
>   Band 1:
>
>     Value: 303.463989257812
>
>
>
> -Jukka Rahkonen-
>
>
>
> *Lähettäjä:* gdal-dev <gdal-dev-bounces at lists.osgeo.org>
> <gdal-dev-bounces at lists.osgeo.org> *Puolesta *Carl Godkin
> *Lähetetty:* torstai 21. lokakuuta 2021 18.47
> *Vastaanottaja:* gdal-dev at lists.osgeo.org
> *Aihe:* [gdal-dev] gdallocationinfo + WCS question...
>
>
>
> Hi,
>
>
>
> I am trying to use gdallocationinfo to query point locations from a WCS
> server and not having any luck. I don't see anything in the docs that says
> this is unsupported but I can't make it work.
>
>
>
> First of all, is there a better way to get an elevation from a given
> lat,lon using WCS?
>
>
>
> Here's an example query using the USGS National Map server:
>
>
>
> gdallocationinfo "WCS:
> https://elevation.nationalmap.gov:443/arcgis/services/3DEPElevation/ImageServer/WCSServer?version=2.0.1&coverage=DEP3Elevation"
> -wgs84 -122.086 42.948 --debug ON
>
>
>
> This is a point in the middle of Crater Lake which I picked since it's
> flat and I know what to expect.
>
>
>
> Anyway, looking at the debug output it appears that the program is
> querying for a GeoTIFF of a VERY large area and that's failing.
>
>
>
> I actually want to do this with my own WCS server but thought it might be
> mis-configured somehow so I tried the USGS server.  With my own server,
> gdallocationinfo seems to be requesting a strange shape from the server (as
> I can see through the debug output).
>
>
>
> Thanks for any help,
>
>
>
> carl
>
>
>
>
>
> _______________________________________________
>
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>
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>
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>
> --
>
> http://www.spatialys.com
>
> My software is free, but my time generally not.
>
>
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