@turf/isolines
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    6.5.0 • Public • Published

    @turf/isolines

    isolines

    Takes a grid FeatureCollection of Point features with z-values and an array of value breaks and generates isolines.

    Parameters

    • pointGrid FeatureCollection<Point> input points
    • breaks Array<number> values of zProperty where to draw isolines
    • options Object Optional parameters (optional, default {})
      • options.zProperty string the property name in points from which z-values will be pulled (optional, default 'elevation')
      • options.commonProperties Object GeoJSON properties passed to ALL isolines (optional, default {})
      • options.breaksProperties Array<Object> GeoJSON properties passed, in order, to the correspondent isoline; the breaks array will define the order in which the isolines are created (optional, default [])

    Examples

    // create a grid of points with random z-values in their properties
    var extent = [0, 30, 20, 50];
    var cellWidth = 100;
    var pointGrid = turf.pointGrid(extent, cellWidth, {units: 'miles'});
    
    for (var i = 0; i < pointGrid.features.length; i++) {
        pointGrid.features[i].properties.temperature = Math.random() * 10;
    }
    var breaks = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    
    var lines = turf.isolines(pointGrid, breaks, {zProperty: 'temperature'});
    
    //addToMap
    var addToMap = [lines];

    Returns FeatureCollection<MultiLineString> a FeatureCollection of MultiLineString features representing isolines


    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/isolines

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

    $ npm install @turf/turf

    Install

    npm i @turf/isolines

    DownloadsWeekly Downloads

    194,232

    Version

    6.5.0

    License

    MIT

    Unpacked Size

    48.1 kB

    Total Files

    7

    Last publish

    Collaborators

    • twelch
    • jamesmilneruk
    • rowanwins
    • tmcw
    • morganherlocker
    • tcql
    • mdfedderly