turf-isobands

turf isobands module

turf.isobands(points, z, resolution, breaks)

Takes a 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 | | | z | string | - a property name from which z values will be pulled | | resolution | number | - resolution of the underlying grid | | breaks | Array. | - where to draw contours |

Example

// create random points with random
// z-values in their properties
var points = turf.random('point', 100, {
  bbox: [0, 30, 20, 50]
});
for (var i = 0; i < points.features.length; i++) {
  points.features[i].properties.z = Math.random() * 10;
}
var breaks = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var isolined = turf.isobands(points, 'z', 15, breaks);
//=isolined

Returns FeatureCollection, isolines

Installation

Requires nodejs.

$ npm install turf-isobands

Tests

$ npm test