`gpf_wfs_get_feature_by_id` - ensure that it doesn't returns huge geometries

[mborne]

Problem

Geometries like "ADMINEXPRESS-COG.LATEST:3Adepartement - Vendée" are not adapted for AI usage.

Proposal

Ensure that gpf_wfs_get_feature_by_id doesn't returns suchs geometries by :

• Returning an error ("geometry is not adapted for LLM usage (too many points : ...)")
• Returning a simplified version of the geometry (TopologyPreservingSimplifier + coordinate truncating)

Notes

• @MZellou what is the source for "admin units" in APITOPO?
• @esgn We might ask GPF diffusion if they have very simplified version (like https://france-geojson.gregoiredavid.fr/ , built with Mapshaper)
• Found an equivalent algo of Mapshaper in PostGIS : ST_CoverageSimplify

[esgn]

Simple first answer : switch from bdtopo to bdcarto :) Or even better ADMIN EXPRESS COG-CARTO-PE

[mborne]

[mborne]

indeed @esgn :

• ADMINEXPRESS-COG.LATEST - 5.9K (current)
• ADMINEXPRESS-COG-CARTO.LATEST - 1.4K
• ADMINEXPRESS-COG-CARTO-PE.LATEST - 0.9K
• ADMINEXPRESS COG CARTO PLUS : Not found on WFS

=> I'll create a dedicated issue for adminexpress tool.

[esgn]

ADMINEXPRESS COG CARTO PLUS => Not to be used. PLUS is for making a france map with DROM/COM aggregated around it. Not our subject here.