Turfjs / turf-isobands

Takes a FeatureCollection of points with z values and an array of value breaks and generates filled contour isobands.

DEPRECATED - replaced with @turf/isobands

turf-isobands

turf isobands module

turf.isobands(points, z, breaks)

Takes a pointGrid FeatureCollection of points with z values and an array of value breaks and generates filled contour isobands. These are commonly used to create elevation maps, but can be used for general data interpolation as well.

Parameters

parameter	type	description
points	FeatureCollection	- grid of points
z	string	- a property name from which z values will be pulled
breaks	Array.	- where to draw contours

Example

// create a grid of points with random z-values in their properties
var bbox = [-70.823, -33.553, -69.823, -32.553];
var cellWidth = 5;
var pointGrid = turf.pointGrid(bbox, cellWidth);
for (var i = 0; i < pointGrid.features.length; i++) {
    pointGrid.features[i].properties.elevation = Math.random() * 10;
}
var breaks = [0, 2.8, 5, 8.5];
var isolined = turf.isobands(pointGrid, 'z', breaks);
//=isolined

Returns FeatureCollection, isolines (MultiPolygons)

Installation

Requires nodejs.

$ npm install turf-isobands

Tests

$ npm test