Support configurable CRS in WCS services

[jisantuc]

Overview

This PR adds a supportedProjections attribute to the WcsConf case class, adds example configuration to the stac-example and ogc-example projects, and consumes those supported projections when rendering the GetCapabilities response.

Checklist

• Description of PR is in an appropriate section of the CHANGELOG and grouped with similar changes if possible

Demo

$ http :9000 service==wcs request==getcapabilities
HTTP/1.1 200 OK
Content-Length: 8925
Content-Type: application/xml
Date: Tue, 16 Feb 2021 16:46:01 GMT

...
<CoverageSummary>
  <ows:Title>US NED</ows:Title>
  <ows:WGS84BoundingBox>
    <ows:LowerCorner>-15.015761449275047 -171.00056648254395</ows:LowerCorner>
    <ows:UpperCorner>72.00056298703436 164.00399450196636</ows:UpperCorner>
  </ows:WGS84BoundingBox>
  <SupportedCRS>urn:ogc:def:crs:OGC::imageCRS</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::3785</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::4326</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::3410</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::3978</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::4617</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::3979</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::3413</SupportedCRS>
  <SupportedCRS>urn:ogc:def:crs:EPSG::26916</SupportedCRS>
  <SupportedFormat>image/geotiff</SupportedFormat>
  <SupportedFormat>image/jpeg</SupportedFormat>
  <SupportedFormat>image/png</SupportedFormat>
  <Identifier>us-ned</Identifier>
</CoverageSummary>
...

Notes

Optional. Ancillary topics, caveats, alternative strategies that didn't work out, anything else.

Testing Instructions

• make the demo request with the ogc-example project running
• confirm you also see the CRSes that match the values from the application.conf
• optional: change those values and verify the server respects your changes

Closes #305

[pomadchin]

Great! Could you also push these changes into the WCS DescribeCoverage request?

The request example: http://localhost:9000/?service=WCS&request=DescribeCoverage&identifiers=us-ned

[jisantuc]

d4e2829 does the DescribeCoverage change -- it wasn't clear to me that the bboxes needed to include all the CRSes as well, since the wms getCapabilities response doesn't include it and the methods for bbox reprojection don't seem to be called anywhere (bboxIn on the two OGCSources I mean). Let me know if that read is incorrect.

[pomadchin]

@jisantuc I think the main goal of the GetDescribeCoverage to make the service comaptible with tools like QGIS. I think QGIS is pretty happy without having all projections listed in the GetCoverage, but (accroding to specs) we still need to list all projections supported by the coverage.

[pomadchin]

LGTM, thanks!