Using colour to distinguish a node's role in a relation in an overpass query

Help and support
1

I’m sure this is possible, but the Overpass documentation is unhelpful.

Basically, I’m looking for an overpass query that shows something a bit like this but with the different node relation roles in different colours - so that this node is displayed differently to this one.

Any overpass query that assigns colours based on role relation would be helpful; I’ll be able to figure the rest out from there.

3

Does the following work?

1 Like
2

Not possible in Overpass Turbo’s MapCSS MapCSS/0.2 - OpenStreetMap Wiki
Overpass Turbo should be able to do it in MapLibre. Unfortunately https://overpass-ultra.us/ with inline YAML support seems bugged that it can’t run anything on my side. You might have to try in https://overpass-ultra.trailsta.sh/ with an entire file hosted online. You can start with a copy of the default https://overpass-ultra.trailsta.sh/style.json to make you own changes.
The GeoJSON has added complexity from the nesting. The "role" “tag” is inside a JSON inside an array inside the "@relation" string.

     {
      "type": "Feature",
      "properties": {
        "@id": "node/11068010896",
        "@relations": [
          {
            "role": "marker",
            "rel": 9487,
            "reltags": {
              "colour": "red",
              "cycle_network": "UK:National Cycle Network",
              "designation": "NCN National Route 65",
              "name": "The White Rose Cycle Route",
              "network": "ncn",
              "operator": "Sustrans",
              "ref": "65",
              "route": "bicycle",
              "type": "route"
            }
          }
        ]
      },
      "geometry": {
        "type": "Point",
        "coordinates": [
          -1.090629,
          53.9308808
        ]
      },
      "id": "node/11068010896"
    },

I’m guessing it should be something similar to "filter": ["all", ["==", ["get","role",["at",0,["get","@relations"]]], "marker"]] , but I can’t get it to work on my first experience with this. Need @Minh_Nguyen or someone else’s help.
https://maplibre.org/maplibre-style-spec/expressions/
If it works, you add a new layer that changes "circle-color" in "paint"

 {
        "id": "overpass-poi",
        "type": "circle",
        "source": "OverpassAPI",
        "filter": ["all", ["==", ["geometry-type"], "Point"]],
        "paint": {
            "circle-stroke-width": 2,
            "circle-stroke-color": "rgba(0, 51, 255, 0.6)",
            "circle-color": "rgba(255, 204, 0, 0.6)"
        }
    }

(this is the default)
https://maplibre.org/maplibre-style-spec/layers/

4

Would something like Amanda’s Waterways map WaterwayMap.org - OSM River Basins work?