THIS PROJECT IS WORK IN PROCESS
A turf.js-like geospatial analysis library working with GeoJSON, written in pure Dart.
This includes a fully RFC 7946-compliant object-representation and serialization for GeoJSON.
Most of the implementation is a direct translation from turf.js.
- Get the Dart tools
- Install the library with
dart pub add turf - Import the library in your code and use it. For example:
import 'package:turf/helpers.dart';
import 'package:turf/src/line_segment.dart';
Feature<Polygon> poly = Feature<Polygon>(
geometry: Polygon(coordinates: [
[
Position(0, 0),
Position(2, 2),
Position(0, 1),
Position(0, 0),
],
[
Position(0, 0),
Position(1, 1),
Position(0, 1),
Position(0, 0),
],
]),
);
void main() {
var total = segmentReduce<int>(
poly,
(previousValue, currentSegment, initialValue, featureIndex,
multiFeatureIndex, geometryIndex, segmentIndex) {
if (previousValue != null) {
previousValue++;
}
return previousValue;
},
0,
combineNestedGeometries: false,
);
print(total);
// total == 6
}
- Nested
GeometryCollections(as described in RFC 7946 section 3.1.8) are not supported which takes a slightly firmer stance than the "should avoid" language in the specification
Tests are run with dart test and benchmarks can be run with
dart run benchmark
Any new benchmarks must be named *_benchmark.dart and reside in the
./benchmark folder.
- along
- area
- bbox
- bboxPolygon
- bearing
- center
- centerOfMass
- centroid
- destination
- distance
- envelope
- length
- midpoint
- pointOnFeature
- polygonTangents
- pointToLineDistance
- rhumbBearing
- rhumbDestination
- rhumbDistance
- square
- greatCircle
- cleanCoords
- flip
- rewind
- round
- truncate
- bboxClip
- bezierSpline
- buffer
- circle
- clone - implemented as a member function of each [GeoJSONObject]
- concave
- convex
- difference
- dissolve
- intersect
- lineOffset
- polygonSmooth
- simplify
- tesselate
- transformRotate
- transformTranslate
- transformScale
- union
- voronoi
- polyLineDecode
- combine
- explode
- flatten
- lineToPolygon
- polygonize
- polygonToLine
- ellipse
- kinks
- lineArc
- lineChunk
- lineIntersect
- lineOverlap
- lineSegment
- lineSlice
- lineSliceAlong
- lineSplit
- mask
- nearestPointOnLine
- sector
- shortestPath
- unkinkPolygon
- randomPosition
- randomPoint
- randomLineString
- randomPolygon
- sample
- interpolate
- isobands
- isolines
- planepoint
- tin
- pointsWithinPolygon
- tag
- hexGrid
- pointGrid
- squareGrid
- triangleGrid
- collect
- clustersDbscan
- clustersKmeans
- coordAll
- coordEach
- coordReduce
- featureEach
- featureReduce
- flattenEach
- flattenReduce
- geomEach
- geomReduce
- propEach
- propReduce
- segmentEach
- segmentReduce
- getCluster
- clusterEach
- clusterReduce