tilebelt-wgs84
Simple tile utilities for WGS84 (EPSG:4326). Inspired by tilebelt which is for web mercator (EPSG:3857).
Install
npm install tilebelt-wgs84Usage
import tilebelt from 'tilebelt-wgs84';
// [x, y, z]
const tile = [10, 15, 8];
console.log(tilebelt.tileToGeoJSON(tile));
// [lngMin, latMin, lngmax, latMax]
const bbox = [-118.125, -39.375, -106.875, -28.125];
console.log(tilebelt.bboxToTiles(bbox, 4));API
| function | description |
|---|---|
| tileToGeoJSON(tile) | Get a geojson representation of a tile |
| tileToBBox(tile) | Get the bbox of a tile |
| bboxToTiles(bbox, zoom) | Gets tiles needed to cover a bbox |
| getChildren(tile) | Get the 4 tiles one zoom level higher (2 tiles at zoom 0) |
| getParent(tile) | Get the tile one zoom level lower |
| getSiblings(tile) | Get the 3 sibling tiles for a tile (1 sibling at zoom 0) |
| hasTile(tiles, tile) | Check to see if an array of tiles contains a tile |
| tilesEqual(tileA, tileB) | Check to see if two tiles are the same |
| tileToQuadkey(tile) | Get the quadkey for a tile |
| quadkeyToTile(quadkey) | Get the tile for a quadkey |
| pointToTile(lng, lat, zoom) | Get the tile for a point at a specified zoom level |
| pointToTileFraction(lng, lat, zoom) | Get the precise fractional tile location for a point at a zoom level |
| Additional utility functions | |
| normalizeLng(number) | Convert longitude so that -180 is 0 and 180 is 1 |
| normalizeLat(number) | Convert latitude so that 90 is 0 and -90 is 1 |
| getExtent(zoom) | Get the total x (columns) and y (rows) tiles at a zoom level |
| bboxesIntersect | Checks if two bboxes intersect |
| intersectBboxes(bbox, bbox) | Get the intersection of two bboxes |
Tests
npm run lint
npm run test