Opening this ticket to start a conversation.

My urban community (https://en.wikipedia.org/wiki/Brest_M%C3%A9tropole) have elevation data as contour data exposed in their open data portal: https://geo.brest-metropole.fr/arcgis/rest/services/public/GPB_REF/MapServer/2210001

I used pyesridump to "scrape" all of it as GeoJSON. I temporarily hosted the file for 30 days in https://transfert.free.fr/NhszRPT

For the datasources.json file:

I'm thinking something like:

{
	"name": "Brest 50cm contours",
	"url": "TBD",
	"filename": "brest_contours.geojson",
	"crs": "ESRI:102110",
	"bbox": [-4.552179, 48.355777, -4.434689727004813, 48.44768660963146],
	"download_method": "http",
	"lookup_method": "contour_lines",
	"lookup_field": "ELEVATION",
	"units": "meters",
	"recheck_interval_days": null
},

• url:
  • Where can I host that ~1Gb file long term?
  • Could "elevation_lookups" use "pyesridump" to download data from the arcgis server directly (it takes some time, especially at it pauses for 10s between each queries, I guess to not overload the server)?
• crs: the page says "Spatial Reference: 102110 (2154)", https://spatialreference.org/ref/esri/102110/
• bbox: later on we can probably enlage the box to include the whole metro area, unless you think it's better to do it now.

Let me know what you think,

Thanks