GeoJSON Layer

The GeoJSON layer uses the GeoJSON data format to draw geometric objects over the map.

These geometric objects, such as a polygon, can be used to:

Highlight areas of the map.
Geofence the nodes defined in the network layer to an area of the map.
Filter the trajectories defined in the observations layer to an area of the map.

Data Format

An example of a GeoJSON object is as follows:

const vancouverDowntown = {
  type: "FeatureCollection",
  features: [
    {
      type: "Feature",
      id: "vancouver-downtown",
      geometry: {
        coordinates: [
          [
            [-123.112266, 49.290164],
            [-123.104240, 49.288166],
            [-123.099288, 49.289272],
            [-123.099998, 49.272750],
            [-123.101699, 49.272972],
            [-123.111076, 49.272926],
            [-123.114448, 49.271774],
            [-123.121162, 49.269538],
            [-123.129280, 49.269531],
            [-123.137680, 49.275318],
            [-123.132331, 49.276931],
            [-123.121093, 49.284366],
            [-123.136680, 49.294456],
            [-123.134689, 49.295810],
            [-123.122711, 49.291500],
            [-123.112266, 49.290164],
          ],
        ],
        type: "Polygon",
      },
    },
  ],
};

You can assign an ID to a GeoJSON feature, allowing event handlers to return the ID for an interaction.

A full definition of the GeoJSON data format can be found at https://geojson.org/.