/kiinteisto-*/features/v2 Advanced spatial filters according to OAPIF - Part 3

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OGC API Features part1 defines "bbox" filter based on WGS 84. Part2 defines "crs" and "bbox-crs" parameters, and how to support also other coordinate systems than WGS 84 both for bbox queries and outputting geometry coordinates on responses.

BETA 1 (2021-03) as described on #3 supports these capabilities.

However there are use cases where more complex spatial filters are needed:

• point
• point with radius
• linestring
• line string with buffer (distance from line)
• polygon
• polygon with buffer (distrance from outer ring of polygon)

OGC API - Features - "Part 3: Filtering and the Common Query Language (CQL)" defines also support for advanced spatial filters. This part is currently on request-for-comments phase (comments due 2021-04-19, see https://www.ogc.org/pressroom/pressreleases/4406), not yet final, however a preliminary would be beneficial also on Cadastre OGC API Features BETA 2 release.