togeojson-with-extended-style

Convert KML and GPX to GeoJSON.

This converts KML & GPX to GeoJSON, in a browser or with nodejs.

It is

• Dependency-free
• Tiny
• Written in vanilla javascript that's jshint-friendly
• Tested

It is not

• Concerned about ugly extensions to KML
• Concerned with having an 'internal format' of its own

Want to use this with Leaflet? Try leaflet-omnivore!

API

toGeoJSON.kml(doc)

Convert a KML document to GeoJSON. The first argument, doc, must be a KML document as an XML DOM - not as a string. You can get this using jQuery's default .ajax function or using a bare XMLHttpRequest with the .response property holding an XML DOM.

The output is a Javascript object of GeoJSON data. You can convert it to a string with JSON.stringify or use it directly in libraries like mapbox.js.

toGeoJSON.gpx(doc)

Convert a GPX document to GeoJSON. The first argument, doc, must be a GPX document as an XML DOM - not as a string. You can get this using jQuery's default .ajax function or using a bare XMLHttpRequest with the .response property holding an XML DOM.

The output is a Javascript object of GeoJSON data, same as .kml outputs.

Using it as a console utility

Install it into your path with npm install -g togeojson.

~> togeojson file.kml > file.geojson

Using it as a nodejs library

Install it into your project with npm install --save togeojson.

// using togeojson in nodejs
 
var tj = require('togeojson'),
    fs = require('fs'),
    // node doesn't have xml parsing or a dom. use jsdom
    jsdom = require('jsdom').jsdom;
 
var kml = jsdom(fs.readFileSync('foo.kml', 'utf8'));
 
var converted = tj.kml(kml);
 
var converted_with_styles = tj.kml(kml, { styles: true });

Using it as a browser library

Download it into your project like

wget https://raw.github.com/tmcw/togeojson/gh-pages/togeojson.js

<script src='jquery.js'></script>
<script src='togeojson.js'></script>
<script>
$.ajax('test/data/linestring.kml').done(function(xml) {
    console.log(toGeoJSON.kml(xml));
});
</script> 

toGeoJSON doesn't include AJAX - you can use jQuery for just AJAX.

KML

Supported:

• Point
• Polygon
• LineString
• name & description
• ExtendedData
• SimpleData
• MultiGeometry -> GeometryCollection
• Styles with hashing
• Tracks & MultiTracks with gx:coords, including altitude
• TimeSpan

Not supported yet:

• NetworkLinks
• GroundOverlays

GPX

Supported:

• Line Paths
• 'name', 'desc', 'author', 'copyright', 'link', 'time', 'keywords' tags

FAQ

What is hashing?

KML's style system isn't semantic: a typical document made through official tools (read Google) has hundreds of identical styles. So, togeojson does its best to make this into something usable, by taking a quick hash of each style and exposing styleUrl and styleHash to users. This lets you work backwards from the awful representation and build your own styles or derive data based on the classes chosen.

Implied here is that this does not try to represent all data contained in KML styles.

Protips:

Have a string of XML and need an XML DOM?

var dom = (new DOMParser()).parseFromString(xmlStr, 'text/xml');