osmtile2bound

This package converts passed OSM slippy tile request values to a WGS84 bound object. This is done by following the suggestions in the OSM Wiki.

Installation

Use standard npm installation

npm install --save osmtile2bound

Usage

Pass the three necessary values (x, y and z) to the function and receive a Bound object

var tile2bound = require('osmtile2bound');

// get WGS84 bounds for "http://c.tile.openstreetmap.org/18/139507/90949.png"
tile2bound(139507, 90949, 18);

// output:
// Bound object with getter methods like getSouth or getNorthEast

Alternative usage

There are two different options how to use the package.

URL

You can also pass a complete URL to the constructor and let the package do the work of parsing:

tile2bound("http://c.tile.openstreetmap.org/18/139507/90949.png");

TileObject

Pass an object that describes a tile (known from bound2osmtile). Don't miss the valid = true here...

tile2bound({
    valid : true,
    x : 139507,
    y : 90949,
    z : 18
});

ChangeLog

• 0.2.0 Removed old bound structure and replaced it by a more usable Bound object:

osmtile2bound(139507, 90949, 18).getNorthWest();
// [ 11.583709716796875, 48.16150547016801 ]

To return the old structure with the new version, you have to pass an option:

osmtile2bound(139507, 90949, 18, {
    oldBoundStyle : true
});

[ [ 11.583709716796875, 48.16150547016801 ],
  [ 11.5850830078125, 48.16150547016801 ],
  [ 11.5850830078125, 48.1605894313262 ],
  [ 11.583709716796875, 48.1605894313262 ] ]

Please note that this option will be removed in 0.3. Sorry for the inconvenience.

Contribute

Feel free to add issues or pull requests. I'm glad for every kind of feedback!