interpolate

Description

Takes a set of points and estimates their 'property' values on a grid using the Inverse Distance Weighting (IDW) method.

Parameters

Name	Type	Description
points	FeatureCollection<Point>	with known value
cellSize	number	the distance across each grid point
options?	Object	Optional parameters (default {})
options.gridType?	string	defines the output format based on a Grid Type (options: 'square' | 'point' | 'hex' | 'triangle') (default 'square')
options.property?	string	the property name in points from which z-values will be pulled, zValue fallbacks to 3rd coordinate if no property exists. (default 'elevation')
options.units?	string	used in calculating cellSize, can be degrees, radians, miles, or kilometers (default 'kilometers')
options.weight?	number	exponent regulating the distance-decay weighting (default 1)

Returns

FeatureCollection<Point | Polygon> grid of points or polygons with interpolated 'property'

Examples

var points = turf.randomPoint(30, { bbox: [50, 30, 70, 50] });

// add a random property to each point
turf.featureEach(points, function (point) {
  point.properties.solRad = Math.random() * 50;
});
var options = { gridType: "points", property: "solRad", units: "miles" };
var grid = turf.interpolate(points, 100, options);

Installation

$ npm install @turf/interpolate

import { interpolate } from "@turf/interpolate";
const result = interpolate(...);

$ npm install @turf/turf

import * as turf from "@turf/turf";
const result = turf.interpolate(...);