@turf/isobands

turf-isobands

isobands

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

Parameters

• points FeatureCollection<Point> a FeatureCollection of Point features
• breaks Array<number> where to draw contours
• zProperty [string] the property name in points from which z-values will be pulled (optional, default 'elevation')
• options [Object] options on output (optional, default {})
  • options.isobandProperties [Array<Object>] GeoJSON properties passed, in order, to the correspondent isoband (order defined by breaks) (optional, default [])
  • options.commonProperties [Object] GeoJSON properties passed to ALL isobands (optional, default {})

Examples

// create random points with random
// z-values in their properties
var extent = [-70.823364, -33.553984, -69.823364, -32.553984];
var cellWidth = 5;
var units = 'miles';
var pointGrid = turf.pointGrid(extent, cellWidth, units);
for (var i = 0; i < pointGrid.features.length; i++) {
    pointGrid.features[i].properties.elevation = Math.random() * 10;
}
var breaks = [0, 5, 8.5];
var isobands = turf.isobands(pointGrid, breaks, 'temp');

//addToMap
var addToMap = [isobands];

Returns FeatureCollection<MultiPolygon> a FeatureCollection of MultiPolygon features representing isobands

---

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-isobands

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

$ npm install @turf/turf