ngsi-geojson - NGSI-v2 to GeoJSON for QGIS, ArcGIS and OpenLayers

Orion            http://fiware-orion:1026
tenant           fiware-service=s4idtcities  fiware-servicepath=/
location attr    location

GET  /health
GET  /models                IoT models with devices: counts, Nature,
                            Subnature, Icon, attributes, layer URL
GET  /models?refresh=true   rebuild the catalogue now
GET  /types                 the same list in NGSI terms
GET  /layers                named layers + one per model
GET  /layers/model-<Name>.geojson   every model has one, automatically
GET  /layers/<name>.geojson
GET  /geojson?model=&type=&q=&attrs=&limit=&offset=&orderBy=&ct=json
     model= and type= are the same selector: a device provisioned
     under model X is an NGSI entity of type X
     spatial, in GeoJSON [lng,lat] order - the flip is done here:
       &polygon=<GeoJSON>&spatial=inside|outside|intersects
       &near=<lng,lat>&radius=<metres>[&minRadius=<metres>]
     or raw Orion: &georel=&geometry=&coords=   (coords is lat-first)
     type accepts a comma-separated list; each is queried separately
POST /notify                (point an Orion subscription here)
GET  /notifications
DELETE /notifications

Named layers:

Plus one layer per model, created automatically as soon as a
model has a device. GET /layers lists them all.

Reminder: coords= is LATITUDE first. GeoJSON coordinates are
longitude first. Both appear in the same broker.