turf-meta
coordEach
Iterate over coordinates in any GeoJSON object, similar to Array.forEach.
Parameters
layer
Object any GeoJSON objectcallback
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 ;;
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 objectcallback
Function a method that takes (memo, value) and returns a new memomemo
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
Examples
var point = type: 'Feature' geometry: null properties: 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 objectcallback
Function a method that takes (memo, coord) and returns a new memomemo
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
Examples
var feature = type: 'Feature' geometry: null properties: {} ;;
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
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