@turf/interpolate

@turf/interpolate

interpolate

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

Parameters

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

Examples

var points = turf.random('points', 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 grid = turf.interpolate(points, 100, 'points', 'solRad', 'miles');

//addToMap
var addToMap = [grid];

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

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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/interpolate

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

$ npm install @turf/turf