[OpenLayers-Dev] ESRI // WCS DescribeCoverage 1.1.0

Fri May 23 09:25:51 PDT 2014

I believe you've hit an oddity in the WCS schemas.

Look at this one:
http://schemas.opengis.net/wcs/1.1.0/wcsDescribeCoverage.xsd

Now look at this one:
http://schemas.opengis.net/wcs/1.1/wcsDescribeCoverage.xsd

Do you see a difference in the ows namespace?  From what I recall, the 
second one is correct. A few years ago I was in a similar situation. I'm 
thinking ArcGIS Servermight be generating XML using the wrong schemas.

So I believe OL is correct and the "problem" is with ArcGIS Server, 
leading from the OGC schema confusion.  I'd love to know the history 
behind it.

Do you have control over the ArcGIS Server instance?  It could be 
something you want to bring up with ESRI.

Cheers,

Tim

On 23/05/2014 12:19 PM, Christopher Eykamp wrote:
> Hello,
>
> I am getting the attached response from an ArcGIS WCS server, with 
> request DescribeCoverage and protocol version 1.1.0.  OpenLayers 
> (latest 1.x from GitHub) cannot retrieve the Title or Abstract 
> attributes because the namespaces referenced in the 
> OpenLayers.Format.WCSDescribeCoverage.v1_1_0 object conflict with what 
> is referenced in the document.
>
> Specifically, the OpenLayers namespaces object includes this line:
>
>     ows: "http://www.opengis.net/ows/1.1"
>
> This in turn is used to generate a namespaceAlias lookup, which will 
> return "ows" when looking up "http://www.opengis.net/ows/1.1". 
> However, in this case, I need "ows" to be mapped to 
> "http://www.opengis.net/ows".  If I make that change in the namespaces 
> definition, tests break. Unfortunately, given the way the aliases are 
> defined, I cannot add a second namespace that maps to "ows", which 
> might fix my problem.
>
> I am unsure how to proceed.  I can't tell if I am encountering a 
> misbehaving server, or if this is just a limitation of the way 
> OpenLayers is architected (hard-coded namespaces that can only have 
> one namespace map to a given alias).  Or have I misunderstood 
> something at a more fundamental level?
>
> Thanks for your advice!
>
> Chris
>
>
>
> <CoverageDescriptions xmlns="http://www.opengis.net/wcs/1.1" 
> xmlns:ows="http://www.opengis.net/ows" 
> xmlns:owcs="http://www.opengis.net/wcs/1.1/ows" 
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
> xmlns:gml="http://www.opengis.net/gml" 
> xsi:schemaLocation="http://www.opengis.net/wcs/1.1 
> ../wcsDescribeCoverage.xsd http://www.opengis.net/wcs/1.1/ows 
> ../owsDataIdentification.xsd"><CoverageDescription><ows:Title>OSDATA.OS_25K_RASTER_1</ows:Title><ows:Abstract/><Identifier>1</Identifier><Domain><SpatialDomain><ows:BoundingBox 
> crs="urn:ogc:def:crs:OGC::imageCRS" dimension="2"><ows:LowerCorner>0 
> 0</ows:LowerCorner><ows:UpperCorner>16273 
> 8848</ows:UpperCorner></ows:BoundingBox><ows:BoundingBox 
> crs="urn:ogc:def:crs:EPSG::4326"><ows:LowerCorner>-2.4975225300277217 
> 57.00034657412791</ows:LowerCorner><ows:UpperCorner>-2.0000237693585987 57.270861907368726</ows:UpperCorner></ows:BoundingBox><GridCRS><GridBaseCRS>urn:ogc:def:crs:EPSG::4326</GridBaseCRS><GridOrigin>-2.4975072449484337 
> 57.27084662228944</GridOrigin><GridOffsets>3.057015857620272e-005 
> -3.0570158576202496e-005</GridOffsets></GridCRS></SpatialDomain></Domain><Range><Field><Title>Field_1</Title><Abstract>Field_1</Abstract><Identifier>Field_1</Identifier><Definition><owcs:AnyValue/></Definition><NullValue>256</NullValue><NullValue>256</NullValue><NullValue>256</NullValue><owcs:InterpolationMethods><owcs:DefaultMethod>nearest</owcs:DefaultMethod><owcs:OtherMethod>bilinear</owcs:OtherMethod><owcs:OtherMethod>bicubic</owcs:OtherMethod></owcs:InterpolationMethods><Axis 
> identifier="BAND"><AvailableKeys><Key>1</Key><Key>2</Key><Key>3</Key></AvailableKeys><owcs:DataType>Byte</owcs:DataType></Axis></Field></Range><SupportedCRS>urn:ogc:def:crs:EPSG::4326</SupportedCRS><SupportedCRS>urn:ogc:def:crs:EPSG::4326</SupportedCRS><SupportedFormat>image/GeoTIFF</SupportedFormat><SupportedFormat>image/NITF</SupportedFormat><SupportedFormat>image/HDF</SupportedFormat><SupportedFormat>image/PNG</SupportedFormat></CoverageDescription></CoverageDescriptions> 
>
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Tim Astle
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