vector_tile 0.0.2

A simple Dart package to encode & decode Mapbox Vector Tile, it refers to a specification developed by MapBox (https://github.com/mapbox/vector-tile-spec).

Dart Vector Tile

Simple package to encode & decode vector tiles. A implemention of Mapbox Vector Tile specification 2.1.

Decode

Decode an vector tile file, either .pbf or .mvt should work:

import 'vector_tile/vector_tile.dart';

main() async {
    VectorTile tile = await decodeVectorTile(path: './data/14-13050-7695.pbf');
}

Sample VectorTile fields

Encode

Create VectorTile and then encode it into protobuf file:

import 'vector_tile/vector_tile.dart';

main() async {
    var values = [
        createVectorTileValue(intValue: Int64(65)),
        createVectorTileValue(stringValue: 'basketball'),
    ];

    var features = [
        createVectorTileFeature(
            id: Int64(31162829580),
            tags: [0, 96, 1, 348],
            type: VectorTile_GeomType.POINT,
            geometry: [9, 8058, 1562],
        ),
    ];

    var layers = [
        createVectorTileLayer(
            name: 'building',
            extent: 4096,
            version: 2,
            keys: ['render_height', 'render_min_height'],
            values: values,
            features: features,
        ),
    ];

    var tile = createVectorTile(layers: layers);

    // Save to disk
    await encodeVectorTile(path: './gen/tile.pbf', tile: tile);
}

Sample VectorTile decoded (as JSON):

{
  "layers": [
    {
      "name": "poi",
      "features": {
        "id": 31162829580,
        "tags": [
          0,
          0,
          1,
          1
        ],
        "type": "POINT",
        "geometry": [
          9,
          8058,
          1562
        ]
      },
      "keys": [
        "render_height",
        "name"
      ],
      "values": [
        {
          "intValue": 65
        },
        {
          "stringValue": "basketball"
        }
      ],
      "extent": 4096,
      "version": 2
    }
  ]
}