Addressing Requirements class 2 (Requirements Class Tileset) of the OGC API Tiles Standard

[doublebyte1]

Overview

According to section 8.3 of the OGC API TIles - Standard:

• The TileMatrixSets endpoint should be advertised in the landing page
• The TileMatrixSets endpoint retrieves a list of links to the descriptions of the tile matrix sets supported by the OGC Web API
• The TileMatrixSet endpoint retrieves the full description of a tile matrix set supported by Web API based servers and client applications following the schema described in the OGC Two Dimensional Tile Matrix Set and Tile Set Metadata 2.0 Standard

This PR adds the TileMatrixSets endpoint, on the root path, as well as our, now hosted, definitions for the WorldCRS84Quad and WebMercatorQuad. For instance:

http://localhost:5000/TileMatrixSets
http://localhost:5000/TileMatrixSets/WorldCRS84Quad
http://localhost:5000/TileMatrixSets/WebMercatorQuad

(the format of the resources can be retrieved using content negotiation, or the f parameter).

In addition, a link with "rel" type "http://www.opengis.net/def/rel/ogc/1.0/tiling-scheme", which points to the hosted tile matrix set definition was added at the tiles collection endpoint and tile metadata endpoint. For instance:

http://localhost:5000/collections/lakes/tiles?f=json
http://localhost:5000//collections/ne_110m_populated_places_simple/tiles/WorldCRS84Quad/metadata?f=json

Related issue / discussion

#1462

Additional information

OGC API - Tiles (core): https://docs.ogc.org/is/20-057/20-057.html
OGC Two Dimensional Tile Matrix Set and Tile Set Metadata: https://docs.ogc.org/is/17-083r4/17-083r4.html#:~:text=The%20OGC%20Two%20Dimensional%20Tile,in%20OGC%2018%2D005r5%20Abstract

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[tomkralidis]

Thanks @doublebyte1! See comments. As well, we need the associated endpoint updates (pygeoapi/flask_app.py) in the starlette and django equivalents).

[doublebyte1]

Thanks @doublebyte1! See comments. As well, we need the associated endpoint updates (pygeoapi/flask_app.py) in the starlette and django equivalents).

@tomkralidis I added the routes for starlette, but unfortunately I am unable to run the django server. I opened an issue here: #1509

[tomkralidis]

Merging, but I would prefer as a next step that we move the tileMatrixes in pygeoapi/models/provider/base.py into a JSON configuration and load at runtime, since the configuration looks like "data" more than something to be "baked" in code.

In the meantime, moving ahead for OATiles compliance. Great work!