Re: [thredds] Can't get THREDDS WCS GetCoverage to work

• To: "Wright, Simon M." <smw@xxxxxxxxx>
• Subject: Re: [thredds] Can't get THREDDS WCS GetCoverage to work
• From: "Signell, Richard" <rsignell@xxxxxxxx>
• Date: Fri, 2 Oct 2015 08:22:11 -0400

Simon,

I think you just don't have your syntax quite right -- you need to
specify "coverage=tas".

So instead of this:
http://localhost:8080/thredds/wcs/smwtestwcs/chess_tas_196101_modified.nc?service=WCS&version=1.0.0&request=GetCoverage=tas&time=1961-01-31T00:00:00Z&format=GeoTIFF

Try this:
http://localhost:8080/thredds/wcs/smwtestwcs/chess_tas_196101_modified.nc?service=WCS&version=1.0.0&request=GetCoverage&coverage=tas&time=1961-01-31T00:00:00Z&format=GeoTIFF


Just to see if there was some issue with the latest release, I tried a
WCS GetCoverage request on our TDS 4.6.3 server and it seems okay:

wget -O test.tif
"http://geoport-dev.whoi.edu/thredds/wcs/bathy/gom03_v10?request=GetCoverage&service=WCS&version=1.0.0&format=GeoTIFF&coverage=topo&bbox=-70.8,41.10,-70.0,41.70";

-Rich

On Fri, Oct 2, 2015 at 3:42 AM, Wright, Simon M. <smw@xxxxxxxxx> wrote:
> Dear All
>
>
>
> Can anyone help me with trying to get a WCS 1.0.0 GetCoverage request to
> work with THREDDS?
>
>
>
> I’m using THREDDS 4.6.3 and get expected XML responses when I attempt WCS
> GetCapabilities and DescribeCoverage requests.  However, when I attempt a
> GetCoverage request, with format equal to GeoTIFF or NetCDF3, I get a “This
> web page is not available ERR_INVALID_RESPONSE” error and when I show the
> details I’m told that “The web page at… …might be temporarily down or it may
> have moved permenantly to a new web address.”
>
>
>
> I tried this initially with gridded data in a British National Grid
> projection and the GetCoverage request fails.  I therefore created a dummy
> netCDF file with a latitude longitude projection and have configured a
> THREDDS instance in a VM on my local machine to test but I am still getting
> the same error – the GetCapabilities and DescribeCoverage requests work and
> the GetCoverage request fails.
>
>
>
> The form of the WCS requests I’m attempting are as follows:
>
> http://localhost:8080/thredds/wcs/smwtestwcs/chess_tas_196101_modified.nc?service=WCS&version=1.0.0&request=GetCapabilities
>
> http://localhost:8080/thredds/wcs/smwtestwcs/chess_tas_196101_modified.nc?service=WCS&version=1.0.0&request=DescribeCoverage&coverage=tas
>
> http://localhost:8080/thredds/wcs/smwtestwcs/chess_tas_196101_modified.nc?service=WCS&version=1.0.0&request=GetCoverage=tas&time=1961-01-31T00:00:00Z&format=GeoTIFF
>
> http://localhost:8080/thredds/wcs/smwtestwcs/chess_tas_196101_modified.nc?service=WCS&version=1.0.0&request=GetCoverage=tas&time=1961-01-31T00:00:00Z&format=NetCDF3
>
>
>
> I have used ToolsUI 4.6 to check that the dummy netCDF file is OK and I can
> successfully display the gridded data in a netCDF file using the
> FeatureTypes | Grid tab.  I can also display the dummy netCDF file in the
> Godiva2 viewer in the VM THREDDS instance.
>
>
>
> The metadata header of the dummy netCDF file is as follows:
>
>
>
> netcdf C:/smw/Workspace/THREDDS_WCS/Data02/dummy.nc {
>
>   dimensions:
>
>     latitude = 6;
>
>     longitude = 12;
>
>   variables:
>
>     float latitude(latitude=6);
>
>       :_CoordinateAxisType = "Lat";
>
>       :units = "degrees_north";
>
>
>
>     int crs;
>
>       :grid_mapping_name = "latitude_longitude";
>
>       :longitude_of_prime_meridian = 0.0; // double
>
>       :semi_major_axis = 6378137.0; // double
>
>       :inverse_flattening = 298.257225363; // double
>
>       :_CoordinateTransformType = "Projection";
>
>       :_CoordinateAxes = "x y";
>
>
>
>     float longitude(longitude=12);
>
>       :_CoordinateAxisType = "Lon";
>
>       :units = "degrees_east";
>
>
>
>     float pressure(latitude=6, longitude=12);
>
>       :_CoordinateAxes = "x y";
>
>       :coordinates = "y x";
>
>       :long_name = "Pressure";
>
>       :units = "hPa";
>
>       :grid_mapping = "crs";
>
>
>
>     float temperature(latitude=6, longitude=12);
>
>       :_CoordinateAxes = "x y";
>
>       :coordinates = "y x";
>
>       :long_name = "Temperature";
>
>       :units = "celsius";
>
>       :grid_mapping = "crs";
>
>
>
>   // global attributes:
>
>   :cdm_data_type = "GRID";
>
>   :Conventions = "CF-1.0";
>
>   :featureType = "GRID";
>
> }
>
>
>
> The netCDF file in the British National Grid can also be displayed in
> ToolsUI 4.6 and Godiva2 viewers.
>
>
>
> Can anyone shed any light on what I might be doing wrong and why I can’t get
> a GetCoverage WVS request to work?
>
>
>
>
>
>
>
> Many thanks, best wishes, Simon.
>
>
>
>
>
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-- 
Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598

• Follow-Ups:
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    • From: Wright, Simon M.

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  • [thredds] Can't get THREDDS WCS GetCoverage to work
    • From: Wright, Simon M.