tile-cover

tile-cover

generate the minimum number of tiles to cover a geojson geometry

Install

npm install tile-cover

Usage

var poly = JSON.parse(fs.readFileSync('./poly.geojson'));
var limits = {
  	min_zoom: 4,
  	max_zoom: 9
  }

cover.geojson(poly.geom, limits);
cover.tiles(poly.geom, limits);
cover.indexes(poly.geom, limits);

API

geojson(geom, limits)

Given a geometry, create cells and return them in a format easily readable by any software that reads GeoJSON.

• geom (Object): GeoJSON geometry
• limits (Object): an object with min_zoom and max_zoom properties specifying the minimum and maximum level to be tiled.

Returns Object, FeatureCollection of cells formatted as GeoJSON Features

tiles(geom, limits)

Given a geometry, create cells and return them in their raw form, as an array of cell identifiers.

• geom (Object): GeoJSON geometry
• limits (Object): an object with min_zoom and max_zoom properties specifying the minimum and maximum level to be tiled.

Returns Array.<Array.<number>>, An array of tiles given as [x, y, z] arrays

indexes(geom, limits)

Given a geometry, create cells and return them as quadkey indexes.

• geom (Object): GeoJSON geometry
• limits (Object): an object with min_zoom and max_zoom properties specifying the minimum and maximum level to be tiled.

Returns Array.<String>, An array of tiles given as quadkeys.

Tests

npm test

Benchmarks

node bench.js

Examples

Polygons:

Lines:

Points: