Mapnik vector tiles (MVT) reader/writer for Swift.
This package requires Swift 5.9 or higher (at least Xcode 13), and compiles on iOS (>= iOS 13), macOS (>= macOS 10.15), tvOS (>= tvOS 13), watchOS (>= watchOS 6) as well as Linux.
dependencies: [
.package(url: "https://github.com/Outdooractive/mvt-tools", from: "1.3.2"),
],
targets: [
.target(name: "MyTarget", dependencies: [
.product(name: "MVTTools", package: "mvt-tools"),
]),
]This package uses the gis-tools library, and is being used by the mvt-postgis library, please have a look at them as well.
You can install the command line tool mvt locally to /usr/local/bin with
# ./install_mvt.sh
# mvt -h
OVERVIEW: A utility for inspecting and working with vector tiles.
USAGE: mvt <subcommand>
OPTIONS:
--version Show the version.
-h, --help Show help information.
SUBCOMMANDS:
dump (default) Print the vector tile as GeoJSON
info Print information about the vector tile
merge Merge two or more vector tiles
query Query the features in a vector tile
export Export the vector tile as GeoJSON
import Import some GeoJSONs to a vector tile
See 'mvt help <subcommand>' for detailed help.- Load and write Mapnik Vector Tiles from/to disk or data objects (also handles gzipped input)
- Export options: Zipped, buffered (in pixels or extents), simplified (in meters or extents)
- Can dump a tile as a GeoJSON object
- Supported projections: EPSG:4326, EPSG:3857 or none (uses the tile's coordinate space)
- Fast search (supports indexing), either within a bounding box or with center and radius
- Extract selected layers into a new tile
- Merge two tiles into one
- Can extract some infos from tiles like feature count, etc.
- Command line tool
import MVTTools
// Load
let mvtData = Data(contentsOf: URL(fileURLWithPath: "14_8716_8015.vector.mvt"))!
let tile = VectorTile(data: mvtData, x: 8716, y: 8015, z: 14, indexed: .hilbert)!
print(tile.isIndexed)
print(tile.layerNames.sorted())
let tileAsGeoJsonData: Data? = tile.toGeoJson(prettyPrinted: true)
...
let result = tile.query(at: Coordinate3D(latitude: 3.870163, longitude: 11.518585), tolerance: 100.0)
...import MVTTools
var tile = VectorTile(x: 8716, y: 8015, z: 14)!
var feature = Feature(Point(Coordinate3D(latitude: 3.870163, longitude: 11.518585)))
feature.properties = [
"test": 1,
"test2": 5.567,
"test3": [1, 2, 3],
"test4": [
"sub1": 1,
"sub2": 2
]
]
tile.setFeatures([feature], for: "test")
// Also have a look at ``VectorTileExportOptions``
let tileData = tile.data()
...On macOS you can use a Swift Playground to inspect the MVTTools API such as layerNames & projection.
- Load tile using MVTTools
- Inspect the properties of the
VectorTile
Print the vector tile as GeoJSON.
mvt works with a vector tile from local disk.
Example 1: Print information about the MVTTools test vector tile at zoom 14, at Yaoundé, Cameroon.
mvt dump Tests/MVTToolsTests/TestData/14_8716_8015.vector.mvtmvt info Tests/MVTToolsTests/TestData/14_8716_8015.vector.mvtResult
Name | Features | Points | LineStrings | Polygons | Unknown | Version
--------------------+----------+--------+-------------+----------+---------+--------
area_label | 55 | 55 | 0 | 0 | 0 | 2
barrier_line | 4219 | 0 | 4219 | 0 | 0 | 2
bridge | 14 | 0 | 14 | 0 | 0 | 2
building | 5414 | 0 | 0 | 5414 | 0 | 2
building_label | 413 | 413 | 0 | 0 | 0 | 2
...
road | 502 | 1 | 497 | 4 | 0 | 2
road_label | 309 | 0 | 309 | 0 | 0 | 2
mvt works with a vector tile served from a web server.
Example 2: Inspect a MapLibre vector tile at zoom 2, with an extent showing Norway to India.
mvt info https://demotiles.maplibre.org/tiles/2/2/1.pbfResult
Name | Features | Points | LineStrings | Polygons | Unknown | Version
----------+----------+--------+-------------+----------+---------+--------
centroids | 104 | 104 | 0 | 0 | 0 | 2
countries | 113 | 0 | 0 | 113 | 0 | 2
geolines | 4 | 0 | 4 | 0 | 0 | 2
Please create an issue or open a pull request with a fix
brew install protobuf swift-protobuf swiftlint
-
Documentation (!)
-
Tests
-
Decode V1 tiles
-
Locking (when updating/deleting features, indexing)
-
Query option: within/intersects
-
Libraries
-
Vector tiles
-
Sample data for testing:
-
Other code for inspiration:
MIT
Thomas Rasch, Outdooractive