# turf 0.0.14
A turf.js-like geospatial analysis library working with GeoJSON, written in pure Dart.
## Installing
```
export PUB_HOSTED_URL=https://pub.mirror.p-hatan.com
flutter pub add turf
```
Published: 2026-09-24T00:10:02.821340Z
Expected archive SHA-256: 607db17ebb5ed83c00d822059e2542094abf6dc76fa1365dceddfee1d9492c5f
Available in cache; verification: upstream_checksum
## Direct dependencies
- geotypes: ^0.0.2
- path: ^1.9.0
- rbush: ^1.1.1
- sweepline_intersections: ^0.0.4
- turf_equality: ^0.1.0
- turf_pip: ^0.0.2
## Package README (untrusted upstream documentation)
A TurfJs-like geospatial analysis library written in pure Dart.
[](https://pub.dev/packages/turf)
TurfDart is a Dart library for [spatial analysis](https://en.wikipedia.org/wiki/Spatial_analysis). It includes traditional spatial operations, helper functions for creating GeoJSON data, and data classification and statistics tools. You can use TurfDart in your Flutter applications on the web, mobile and desktop or in pure Dart applications running on the server.
As the foundation, we are using [Geotypes](https://github.com/dartclub/geotypes), a lightweight dart library that provides a strong GeoJSON object model and fully [RFC 7946](https://tools.ietf.org/html/rfc7946) compliant serializers.
Most of the functionality is a translation from [turf.js](https://github.com/Turfjs/turf), the progress can be found [here](Progress.md).
## Get started
- Get the [Dart tools](https://dart.dev/tools)
- Install the library with `dart pub add turf`
- Import the library in your code and use it. For example:
```dart
import 'package:turf/helpers.dart';
import 'package:turf/src/line_segment.dart';
Feature poly = Feature(
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(
poly,
(previousValue, currentSegment, initialValue, featureIndex,
multiFeatureIndex, geometryIndex, segmentIndex) {
if (previousValue != null) {
previousValue++;
}
return previousValue;
},
0,
combineNestedGeometries: false,
);
print(total);
// total == 6
}
```
## GeoJSON Object Model
### Notable Design Decisions
- Nested `GeometryCollections` (as described in
[RFC 7946 section 3.1.8](https://datatracker.ietf.org/doc/html/rfc7946#section-3.1.8))
are _not supported_ which takes a slightly firmer stance than the "should
avoid" language in the specification
## Tests and Benchmarks
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.
## Changelog
## 0.0.14
- Adds missing library exports
## 0.0.13
- Fixes `Polyline.decode` on the web. It decoded each negative coordinate delta as a large positive number.
## 0.0.12
- Implements support for GeoJSON "other members" / foreign members, including JSON serialization, deserialization, cloning, and copy helpers [#222](https://github.com/dartclub/turf_dart/pull/222)
- Implements `lineclip` for clipping line strings and polygons to bounding boxes [#235](https://github.com/dartclub/turf_dart/pull/235)
- Implements `pointOnFeature`, with tests, benchmarks, examples, and generated visualization fixtures [#216](https://github.com/dartclub/turf_dart/pull/216)
- Adds library-level doc comments to all public libraries and fixes documentation reference warnings [#257](https://github.com/dartclub/turf_dart/pull/257)
## 0.0.11
- Implements `simplify` for `Feature` [#183](https://github.com/dartclub/turf_dart/pull/183)
- Implements `circle` [#187](https://github.com/dartclub/turf_dart/pull/187)
- Implements `pointToLineDistance` [#189](https://github.com/dartclub/turf_dart/pull/189)
- Implements `lineSliceAlong` [#190](https://github.com/dartclub/turf_dart/pull/190)
- Implements `polygonTangents` [#212](https://github.com/dartclub/turf_dart/pull/212)
- Implements `square` [#213](https://github.com/dartclub/turf_dart/pull/213)
- Implements `envelope` [#215](https://github.com/dartclub/turf_dart/pull/215)
- Implements `centerOfMass` [#221](https://github.com/dartclub/turf_dart/pull/221)
- Implements `toMercator` and `toWgs84` [#230](https://github.com/dartclub/turf_dart/pull/230)
- Implements `flip` [#231](https://github.com/dartclub/turf_dart/pull/231)
- Implements `randomLineString` [#242](https://github.com/dartclub/turf_dart/pull/242)
- Implements `combine` to convert feature collections to multi-geometries [#245](https://github.com/dartclub/turf_dart/pull/245)
- Implements `flatten` to flatten Multi* geometries to their single counterparts [#246](https://github.com/dartclub/turf_dart/pull/246)
- Fixes wrong conversion from meters to yards and from meters to inches [#194](https://github.com/dartclub/turf_dart/pull/194)
- Fixes `booleanIntersects` false positive [#196](https://github.com/dartclub/turf_dart/pull/196)
- CI/CD and tooling improvements [#218](https://github.com/dartclub/turf_dart/pull/218) [#247](https://github.com/dartclub/turf_dart/pull/247) [#248](https://github.com/dartclub/turf_dart/pull/248) [#252](https://github.com/dartclub/turf_dart/pull/252)
## 0.0.10
- Implements `lineSlice` [#158](https://github.com/dartclub/turf_dart/pull/158)
- Introduce [geotypes package](https://pub.dev/packages/geotypes) for GeoJSON serialization
- Other small improvements
## 0.0.9
- Implements `length`, `along` [#153](https://github.com/dartclub/turf_dart/pull/153)
- Documentation: Improves pub.dev scores by fixing bad links in Readme.md
## 0.0.8
- Implements `transformRotate`, `rhumbDistance`, `rhumbDestination`, `centroid` [#147](https://github.com/dartclub/turf_dart/pull/147)
- Introduce `localCoordIndex` in `coordEach`
- Implements all the `boolean`* functions [#91](https://github.com/dartclub/turf_dart/pull/91)
- Implements `area` function [#123](https://github.com/dartclub/turf_dart/pull/123)
- Implements `polygonSmooth` function [#127](https://github.com/dartclub/turf_dart/pull/127)
- Fixes missing parameter in nearest point on line [#145](https://github.com/dartclub/turf_dart/pull/145)
- Other core improvements
- Support for Dart 3
## 0.0.7
- Implements `nearestPointOn(Multi)Line` [#87](https://github.com/dartclub/turf_dart/pull/87)
- Implements `explode` function [#93](https://github.com/dartclub/turf_dart/pull/93)
- Implements `bbox-polygon` and `bbox`, `center`, polyline functions [#99](https://github.com/dartclub/turf_dart/pull/99)
- Updates the `BBox`-class constructor [#100](https://github.com/dartclub/turf_dart/pull/100)
- Implements `rhumbBearing` function [#109](https://github.com/dartclub/turf_dart/pull/109)
- Implements `lineToPolygon` and `polygonToLine` functions [#104](https://github.com/dartclub/turf_dart/pull/104)
- Implements `truncate` function [#111](https://github.com/dartclub/turf_dart/pull/111)
- Implements `cleanCoord` function [#112](https://github.com/dartclub/turf_dart/pull/112)
- Some documentation & README improvements
## 0.0.6+3
- Rename examples file
## 0.0.6+2
- Added code examples
- Fixed segment * callbacks
## 0.0.6
- This is solely a quality release, without new functionality:
- Documentation: improves pub.dev scores, raised documentation coverage, fixed typos
- Return type fixes for the the meta extensions
## 0.0.5
- Implements *all* meta functions and `lineSegment`
- Adds a lot of documentation
- Several bug and type fixes
## 0.0.4
- Implements the `featureEach` and `propEach` meta function. [#24](https://github.com/dartclub/turf_dart/pull/24)
- PR [#43](https://github.com/dartclub/turf_dart/pull/43):
- Several bugfixes with the deserialization of JSON
- Several new constructors
- Vector arithmetics operations
## 0.0.3
- Null-safety support
## 0.0.2+3
Implements the `geomEach` meta function. [#13](https://github.com/dartclub/turf_dart/pull/13)
## 0.0.2+1
- initialize lists and maps empty in constructors, if not provided
## 0.0.2
- normalization for coordinates (Position)
- and yes, it's still under heavy development
## 0.0.1
- Initial version, still under heavy development