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turf-helpers
Advanced tools
Readme
Wraps a GeoJSON Geometry in a GeoJSON Feature.
Parameters
geometry
Geometry input geometryproperties
Object propertiesExamples
var geometry = {
"type": "Point",
"coordinates": [
67.5,
32.84267363195431
]
}
var feature = turf.feature(geometry);
//=feature
Returns FeatureCollection a FeatureCollection of input features
Takes coordinates and properties (optional) and returns a new Point feature.
Parameters
coordinates
Array<number> longitude, latitude position (each in decimal degrees)properties
[Object] an Object that is used as the Feature's
propertiesExamples
var pt1 = turf.point([-75.343, 39.984]);
//=pt1
Returns Feature<Point> a Point feature
Takes an array of LinearRings and optionally an Object with properties and returns a Polygon feature.
Parameters
coordinates
Array<Array<Array<number>>> an array of LinearRingsproperties
[Object] a properties objectExamples
var polygon = turf.polygon([[
[-2.275543, 53.464547],
[-2.275543, 53.489271],
[-2.215118, 53.489271],
[-2.215118, 53.464547],
[-2.275543, 53.464547]
]], { name: 'poly1', population: 400});
//=polygon
Returns Feature<Polygon> a Polygon feature
Creates a LineString based on a coordinate array. Properties can be added optionally.
Parameters
coordinates
Array<Array<number>> an array of Positionsproperties
[Object] an Object of key-value pairs to add as propertiesExamples
var linestring1 = turf.lineString([
[-21.964416, 64.148203],
[-21.956176, 64.141316],
[-21.93901, 64.135924],
[-21.927337, 64.136673]
]);
var linestring2 = turf.lineString([
[-21.929054, 64.127985],
[-21.912918, 64.134726],
[-21.916007, 64.141016],
[-21.930084, 64.14446]
], {name: 'line 1', distance: 145});
//=linestring1
//=linestring2
Returns Feature<LineString> a LineString feature
Takes one or more Features and creates a FeatureCollection.
Parameters
features
Array<Feature> input featuresExamples
var features = [
turf.point([-75.343, 39.984], {name: 'Location A'}),
turf.point([-75.833, 39.284], {name: 'Location B'}),
turf.point([-75.534, 39.123], {name: 'Location C'})
];
var fc = turf.featureCollection(features);
//=fc
Returns FeatureCollection a FeatureCollection of input features
Creates a Feature<MultiLineString> based on a coordinate array. Properties can be added optionally.
Parameters
coordinates
Array<Array<Array<number>>> an array of LineStringsproperties
[Object] an Object of key-value pairs to add as propertiesExamples
var multiLine = turf.multiLineString([[[0,0],[10,10]]]);
//=multiLine
Returns Feature<MultiLineString> a MultiLineString feature
Creates a Feature<MultiPoint> based on a coordinate array. Properties can be added optionally.
Parameters
coordinates
Array<Array<number>> an array of Positionsproperties
[Object] an Object of key-value pairs to add as propertiesExamples
var multiPt = turf.multiPoint([[0,0],[10,10]]);
//=multiPt
Returns Feature<MultiPoint> a MultiPoint feature
Creates a Feature<MultiPolygon> based on a coordinate array. Properties can be added optionally.
Parameters
coordinates
Array<Array<Array<Array<number>>>> an array of Polygonsproperties
[Object] an Object of key-value pairs to add as propertiesExamples
var multiPoly = turf.multiPolygon([[[[0,0],[0,10],[10,10],[10,0],[0,0]]]);
//=multiPoly
Returns Feature<MultiPolygon> a multipolygon feature
Creates a Feature<GeometryCollection> based on a coordinate array. Properties can be added optionally.
Parameters
geometries
Array<{Geometry}> an array of GeoJSON Geometriesproperties
[Object] an Object of key-value pairs to add as propertiesExamples
var pt = {
"type": "Point",
"coordinates": [100, 0]
};
var line = {
"type": "LineString",
"coordinates": [ [101, 0], [102, 1] ]
};
var collection = turf.geometrycollection([[0,0],[10,10]]);
//=collection
Returns Feature<GeometryCollection> a geometrycollection feature
This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.
Install this module individually:
$ npm install turf-helpers
Or install the Turf module that includes it as a function:
$ npm install turf
FAQs
turf geometries
We found that turf-helpers demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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