Package Exports
- turf-tin
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (turf-tin) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
turf-tin
turf tin module
turf.tin(points, propertyName)
Takes a set of Point|points and the name of a z-value property and creates a Triangulated Irregular Network, or a TIN for short, returned as a collection of Polygons. These are often used for developing elevation contour maps or stepped heat visualizations.
This triangulates the points, as well as adds properties called a, b,
and c representing the value of the given propertyName at each of
the points that represent the corners of the triangle.
Parameters
| parameter | type | description |
|---|---|---|
points |
FeatureCollection.<Point> | input points |
propertyName |
String | optional: name of the property from which to pull z values This is optional: if not given, then there will be no extra data added to the derived triangles. |
Example
// generate some random point data
var points = turf.random('points', 30, {
bbox: [50, 30, 70, 50]
});
//=points
// add a random property to each point between 0 and 9
for (var i = 0; i < points.features.length; i++) {
points.features[i].properties.z = ~~(Math.random() * 9);
}
var tin = turf.tin(points, 'z')
for (var i = 0; i < tin.features.length; i++) {
var properties = tin.features[i].properties;
// roughly turn the properties of each
// triangle into a fill color
// so we can visualize the result
properties.fill = '#' + properties.a +
properties.b + properties.c;
}
//=tinReturns FeatureCollection.<Polygon>, TIN output
Installation
Requires nodejs.
$ npm install turf-tinTests
$ npm test