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

Thu Oct 21 12:24:49 PDT 2021

Hi Jukka,

Strangely, the command you pasted doesn't work for me, at with GDAL 3.3.1
on Windows (with quotes added appropriately):

gdallocationinfo "WCS:
https://beta-karttakuva.maanmittauslaitos.fi/wcs/service/ows?version=2.0.1&coverage=korkeusmalli__korkeusmalli"
-wgs84 27 68
ERROR 1: PROJ: proj_uom_get_info_from_database: unit of measure not found
Report:
  Location: (228000P,119567L)
  Band 1:
ERROR 1: Returned tile does not match expected band configuration.
Response has 1 bands while this dataset has 3 bands.

ERROR 1: C:\Users\carl\.gdal\wcs_cache\nhXWS.xml, band 1: IReadBlock failed
at X offset 222, Y offset 233: Returned tile does not match expected band
configuration.
Response has 1 bands while this dataset has 3 bands.

  Band 2:
ERROR 1: Returned tile does not match expected band configuration.
Response has 1 bands while this dataset has 3 bands.

ERROR 1: C:\Users\carl\.gdal\wcs_cache\nhXWS.xml, band 2: IReadBlock failed
at X offset 222, Y offset 233: Returned tile does not match expected band
configuration.
Response has 1 bands while this dataset has 3 bands.

  Band 3:
ERROR 1: Returned tile does not match expected band configuration.
Response has 1 bands while this dataset has 3 bands.

ERROR 1: C:\Users\carl\.gdal\wcs_cache\nhXWS.xml, band 3: IReadBlock failed
at X offset 222, Y offset 233: Returned tile does not match expected band
configuration.
Response has 1 bands while this dataset has 3 bands.

I find that somewhat reassuring since I get a similar error when querying
my own WCS server (that you helped me set up over the past couple of days):

gdallocationinfo "WCS:
http://localhost:8080/wcs?service=WCS&version=2.0.1&coverageid=SRTM_3_arc-second_grid"
-wgs84 -122.086 42.948
Report:
  Location: (3498P,8465L)
  Band 1:
ERROR 1: Returned tile does not match expected configuration.
Got 4094x512 instead of 1024x512.
ERROR 1: C:\Users\carl\.gdal\wcs_cache\hcoMu.xml, band 1: IReadBlock failed
at X offset 3, Y offset 16: Returned tile does not match expected
configuration.
Got 4094x512 instead of 1024x512.

Or, with --debug ON:

gdallocationinfo "WCS:
http://localhost:8080/wcs?service=WCS&version=2.0.1&coverageid=SRTM_3_arc-second_grid"
-wgs84 -122.086 42.948 --debug ON
GDAL: GDALOpen(WCS:
http://localhost:8080/wcs?service=WCS&version=2.0.1&coverageid=SRTM_3_arc-second_grid,
this=00000228A4B2B970) succeeds as WCS.
Report:
  Location: (3498P,8465L)
  Band 1:
GDAL: GDAL_CACHEMAX = 6535 MB
WCS: Requesting
http://localhost:8080/wcs?service=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=SRTM_3_arc-second_grid&SUBSET=long%28-125,-121.5880315%29&SUBSET=lat%2842.749567499999998,43.176063499999998%29&Format=image/tiff
HTTP: Fetch(
http://localhost:8080/wcs?service=WCS&REQUEST=GetCoverage&VERSION=2.0.1&COVERAGEID=SRTM_3_arc-second_grid&SUBSET=long%28-125,-121.5880315%29&SUBSET=lat%2842.749567499999998,43.176063499999998%29&Format=image/tiff
)
HTTP: libcurl/7.78.0 Schannel zlib/1.2.11 libssh2/1.9.0
HTTP: GDAL was built against curl 7.77.0, but is running against 7.78.0.
WCS: GDALOpenResult() on content-type: image/tiff
GDAL: GDALOpen(/vsimem/wcs/00000228A4B2B970/wcsresult.dat,
this=00000228A4CEEC40) succeeds as GTiff.
ERROR 1: Returned tile does not match expected configuration.
Got 4094x512 instead of 1024x512.
GDAL: GDALClose(/vsimem/wcs/00000228A4B2B970/wcsresult.dat,
this=00000228A4CEEC40)
ERROR 1: C:\Users\carl\.gdal\wcs_cache\hcoMu.xml, band 1: IReadBlock failed
at X offset 3, Y offset 16: Returned tile does not match expected
configuration.
Got 4094x512 instead of 1024x512.
GDAL: GDALClose(C:\Users\carl\.gdal\wcs_cache\hcoMu.xml,
this=00000228A4B2B970)

Any suggestions?  If I break the above debug output down and use "curl" to
download the GeoTIFF and then use gdallocationinfo on the downloaded file,
I get a reasonable result.
I guess I could do that.  But what I find very strange is that
gdallocationinfo seems to request a rather odd-shaped patch (-125 to -121.5
in longitude, but only 42.75 to 43.18 in latitude) which cases trouble.

Thanks a lot,

carl

On Thu, Oct 21, 2021 at 11:16 AM Rahkonen Jukka (MML) <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> 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> *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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