Gpx 2 geoJSON

A simple parser that I made for handling parsing of Strava GPX files to geoJSON, and simplifying the geometry.

This reduces the files a lot and makes it more manageable in a map. The attached GPX file is 223kb, but the geoJSON ends up at less than 4kb, while still retaining most of the information that's required for a map path. GPX files can be huge as my Garmin logs every second, and this is a simple way to reduce the size of the file.

The geometry is simplified using Ramer-Douglas-Peucker algorithm, thanks to the implementation at https://github.com/seabre/simplify-geometry

It's not been made for any other types of geometry than LineStrings as that is my use case.

How to use

1import parser from "@bovan/gpx2geojson";
2
3// define url to gpx file
4const gpxDir = path.join(__dirname, "DIR_NAME_CONTAINING_GPX");
5const fileName = "run.gpx";
6export async function parseGpx() {
7  // Read the GPX file to a variable
8  const gpxData = await readFile(path.join(gpxDir, fileName), "utf8");
9  // parse the gpx data to geoJSON
10  const simplifiedGeoJSON = parser(gpxData);
11  // Do something with the simplified geoJSON, like putting it in a map
12  return simplifiedGeoJSON;
13}