Imageserver WCS support

[smohiudd]

Description

pyarc2stac currently supports ImageServer WMS endpoints when creating STAC collections. Although this works for visualization, for example in the dashboard E&A (see example dataset in E&A and STAC collection), timeseries analysis is not possible with WMS endpoints. This is because WMS endpoints serves rendered tile images while timeseries analysis requires raster data values like those in a COG file.

See the ESRI WCS documentation for more details on WCS Services.

The WMS endpoints included in a STAC collection follow the web-map-links STAC extension. There is currently no spec for WCS endpoints so this ticket may involve proposing an addition to the extension.

There may currently be limitations with E&A and how Mapbox is able to render WCS endpoints. That limitation is out of the scope of this ticket since we are only concerned with creating the STAC collection. Future dashboard E&A or DeckGL plugin compatibility with WCS will be handled as a separate task and by other teams.

Acceptance Criteria

• pyarc2stac is able to create STAC collection using ImageServer WCS endpoint and is tested with NOAA dataset

[sandrahoang686]

Update:
PR for web-map-links: sandrahoang686/web-map-links#1
4/15 Update - Synced with Sid & Jennifer and Sid will be taking a look at OGC WCS documentation and seeing if anything else is needed

[sandrahoang686]

Document References

• https://docs.eoxserver.org/en/0.4/users/EO-WCS_request_parameters.html#getcoverage
• https://docs.ogc.org/is/09-110r3/09-110r3.pdf

[sandrahoang686]

PR for adding WCS schema extenstion to web-map-links opened stac-extensions/web-map-links#30