@turf/tin

@turf/tin

tin

Takes a set of points 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.

If an optional z-value property is provided then it is added as properties called a, b, and c representing its value at each of the points that represent the corners of the triangle.

Parameters

• points FeatureCollection<Point> input points
• z 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 data
var points = turf.randomPoint(30, {bbox: [50, 30, 70, 50]});

// 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');

//addToMap
var addToMap = [tin, points]
for (var i = 0; i < tin.features.length; i++) {
  var properties  = tin.features[i].properties;
  properties.fill = '#' + properties.a + properties.b + properties.c;
}

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 single module individually:

$ npm install @turf/tin

Or install the all-encompassing @turf/turf module that includes all modules as functions:

$ npm install @turf/turf

Similar packages

Other packages similar to @turf/tin

d3-delaunay

d3-delaunay is a D3 module that provides fast algorithms for computing Delaunay triangulations and Voronoi diagrams. It is similar to @turf/tin in that it can be used to create triangulated networks from a set of points. However, d3-delaunay is more focused on performance and is often used in data visualization contexts.

earcut

earcut is a fast, robust polygon triangulation library. While it is not specifically designed for geospatial data, it can be used to triangulate polygons, which is a similar operation to creating a TIN. earcut is known for its speed and simplicity.

triangulate

triangulate is a simple library for triangulating 2D polygons. It is similar to @turf/tin in that it can be used to create a network of triangles from a set of points. However, it is more general-purpose and not specifically designed for geospatial applications.