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
