turf-tin
tin
Takes a set of 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
points
FeatureCollection<Point> input pointsz
[String] 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.
Examples
// generate some random point datavar points = turf;//=points// add a random property to each point between 0 and 9for var i = 0; i < pointsfeatureslength; i++ pointsfeaturesipropertiesz = ~~Math * 9;var tin = turffor var i = 0; i < tinfeatureslength; i++ var properties = tinfeaturesiproperties; // roughly turn the properties of each // triangle into a fill color // so we can visualize the result propertiesfill = '#' + propertiesa + propertiesb + propertiesc;//=tin
Returns FeatureCollection<Polygon> TIN output
This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.
Installation
Install this module individually:
$ npm install turf-tin
Or install the Turf module that includes it as a function:
$ npm install turf