fromData<T extends Geometry> static method

FeatureCollection<Feature<T>> fromData<T extends Geometry>(Map<String, dynamic> data, { TextReaderFormat<FeatureContent> format = GeoJSON.feature, CoordRefSys? crs, Map<String, dynamic>? options, })

Decodes a feature collection from data conforming to format.

Data should be a JSON Object as decoded by the standard json.decode().

Feature items on a collection contain a geometry of T.

When format is not given, then the feature format of GeoJSON is used as a default.

Use crs to give hints (like axis order, and whether x and y must be swapped when read in) about coordinate reference system in text input.

Format or decoder implementation specific options can be set by options.

Examples:

// a feature collection with two features
FeatureCollection.fromData(
  format: GeoJSON.feature,
  {
    'type': 'FeatureCollection',
    'features': [
      // a feature with an id and a point geometry (2D coordinates)
      {
        'type': 'Feature',
        'id': '1',
        'geometry': {
          'type': 'Point',
          'coordinates': [10.0, 20.0]
        }
      },
      // a feature with properties and a line string geometry (3D)
      {
        'type': 'Feature',
        'geometry': {
          'type': 'LineString',
          'coordinates': [
            [10.0, 20.0, 30.0],
            [12.5, 22.5, 32.5],
            [15.0, 25.0, 35.0]
          ]
        },
        'properties': {
          'textProp': 'this is property value',
          'intProp': 10,
          'doubleProp': 29.5,
          'arrayProp': ['foo', 'bar']
        }
      }
    ]
  },
);

Implementation

static FeatureCollection<Feature<T>> fromData<T extends Geometry>(
  Map<String, dynamic> data, {
  TextReaderFormat<FeatureContent> format = GeoJSON.feature,
  CoordRefSys? crs,
  Map<String, dynamic>? options,
}) =>
    FeatureBuilder.fromData<FeatureCollection<Feature<T>>, T>(
      data,
      format: format,
      crs: crs,
      options: options,
    );