turf-meta

turf-meta

coordEach

Iterate over coordinates in any GeoJSON object, similar to Array.forEach.

Parameters

• layer Object any GeoJSON object
• callback Function a method that takes (value)
• excludeWrapCoord [boolean] whether or not to include the final coordinate of LinearRings that wraps the ring in its iteration.

Examples

var point = { type: 'Point', coordinates: [0, 0] };
coordEach(point, function(coords) {
  // coords is equal to [0, 0]
});

coordReduce

Reduce coordinates in any GeoJSON object into a single value, similar to how Array.reduce works. However, in this case we lazily run the reduction, so an array of all coordinates is unnecessary.

Parameters

• layer Object any GeoJSON object
• callback Function a method that takes (memo, value) and returns a new memo
• memo Any the starting value of memo: can be any type.
• excludeWrapCoord [boolean] whether or not to include the final coordinate of LinearRings that wraps the ring in its iteration.

Returns Any combined value

propEach

Iterate over property objects in any GeoJSON object, similar to Array.forEach.

Parameters

• layer Object any GeoJSON object
• callback Function a method that takes (value)

Examples

var point = { type: 'Feature', geometry: null, properties: { foo: 1 } };
propEach(point, function(props) {
  // props is equal to { foo: 1}
});

propReduce

Reduce properties in any GeoJSON object into a single value, similar to how Array.reduce works. However, in this case we lazily run the reduction, so an array of all properties is unnecessary.

Parameters

• layer Object any GeoJSON object
• callback Function a method that takes (memo, coord) and returns a new memo
• memo Any the starting value of memo: can be any type.

Returns Any combined value

featureEach

Iterate over features in any GeoJSON object, similar to Array.forEach.

Parameters

• layer Object any GeoJSON object
• callback Function a method that takes (value)

Examples

var feature = { type: 'Feature', geometry: null, properties: {} };
featureEach(feature, function(feature) {
  // feature == feature
});

coordAll

Get all coordinates from any GeoJSON object, returning an array of coordinate arrays.

Parameters

• layer Object any GeoJSON object

Returns Array<Array<Number>> coordinate position array

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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.

Installation

Install this module individually:

$ npm install turf-meta

Or install the Turf module that includes it as a function:

$ npm install turf