Class: TopoJSON

ol/format/TopoJSON~TopoJSON 


import TopoJSON from 'ol/format/TopoJSON.js';

Feature format for reading data in the TopoJSON format.

new TopoJSON(options)

format/TopoJSON.js, line 57
Name Type Description
dataProjection ProjectionLike (defaults to 'EPSG:4326')

Default data projection.
layerName string | undefined

Set the name of the TopoJSON topology objects's children as feature property with the specified name. This means that when set to 'layer', a topology like

{
  "type": "Topology",
  "objects": {
    "example": {
      "type": "GeometryCollection",
      "geometries": []
    }
  }
}

will result in features that have a property 'layer' set to 'example'. When not set, no property will be added to features.
layers Array.<string> | undefined

Names of the TopoJSON topology's objects's children to read features from. If not provided, features will be read from all children.

Extends