turf-isobands
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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
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);
Returns FeatureCollection
, isolines
Installation
Requires nodejs.
$ npm install turf-isobands
Tests
$ npm test