Geo & Maps Tools

ArrayKit's Geo / Maps tools cover the everyday tasks that come up when you work with location data — no desktop GIS required. Start with the Coordinate Map Viewer to drop a pin from a latitude/longitude pair, or click the map to read coordinates back out. Measure the great-circle distance and bearing between two points, load a GPX file to see a route on the map, or paste GeoJSON to validate it and preview its features. Convert between the formats you actually get handed — GPX, KML, WKT, GeoJSON and CSV — and encode or decode Google polylines. Switch a single coordinate between decimal degrees, DMS, Plus Codes, MGRS, UTM and geohash without hunting for the right formula. Everything runs on your device; only OpenStreetMap map tiles are loaded to draw the maps, and the coordinates and files you work with are never uploaded.

• Coordinate Map Viewer — Plot a latitude/longitude on an OpenStreetMap map, or click the map to read coordinates back out.
• GPX to GeoJSON — Convert GPX to GeoJSON and back — GPS tracks, routes and waypoints to GeoJSON features, or GeoJSON back to a GPX file.
• KML to GeoJSON — Convert KML ⇄ GeoJSON — turn Google Earth KML into GeoJSON for web maps, or GeoJSON back into KML.
• WKT to GeoJSON — Convert WKT (Well-Known Text) to GeoJSON and back, in your browser.
• GeoJSON to CSV — Convert a GeoJSON FeatureCollection to CSV and back — Point features become latitude/longitude columns with their properties.
• Plus Codes Converter — Convert between latitude/longitude and a Plus Code (Open Location Code) both ways, with the covered bounding box and cell size.
• MGRS Converter — Convert between latitude/longitude and MGRS (Military Grid Reference System) coordinates, both ways, in your browser.
• Distance Between Coordinates — Measure the great-circle distance between two latitude/longitude points in km, miles and nautical miles, with bearing and a map.
• GPX Viewer — Open a GPX file and see its tracks, routes and waypoints on a map, with distance, elevation and bounds.
• Coordinate Converter (DMS & Decimal) — Convert coordinates between decimal degrees, DMS and degrees-decimal-minutes, both ways, in your browser.
• Geohash Converter — Encode latitude/longitude to a geohash and decode a geohash back to coordinates, with bounding box and neighbors.
• Polyline Encoder & Decoder — Encode coordinates to a Google encoded polyline string and decode polylines back to coordinates or GeoJSON.
• GeoJSON Viewer & Validator — Paste or drop GeoJSON to validate it and see its features on a map, with feature counts and a bounding box.
• UTM Converter — Convert between latitude/longitude and UTM coordinates (zone, hemisphere, easting, northing) on the WGS84 ellipsoid.
• GeoJSON Bounding Box — Get the bounding box, centre, area and length of any GeoJSON, in both coordinate orders.
• GeoJSON Simplify — Thin dense GeoJSON lines and polygons with Douglas–Peucker at a metre tolerance.

Frequently asked questions

Which tools are in ArrayKit's Geo / Maps category?

The category spans map viewing (Coordinate Map Viewer, GPX Viewer, GeoJSON Viewer), measurement (Distance Between Coordinates), format converters (GPX, KML, WKT, GeoJSON and CSV, plus Google polylines), and coordinate-system converters (DMS and decimal degrees, Plus Codes, MGRS, UTM and geohash) — all in your browser.

Do these geo tools upload my coordinates or files to a server?

No. Coordinates, GPX/KML/GeoJSON files and everything else are processed on your device. Only OpenStreetMap map tiles are loaded over the network to render maps; ArrayKit does not store what you work with.

Which coordinate systems and file formats can I convert between?

Files: GPX, KML, WKT, GeoJSON and CSV in both directions, plus Google encoded polylines. Coordinate systems: decimal degrees, degrees-minutes-seconds (DMS), Plus Codes (Open Location Code), MGRS, UTM and geohash.

Is the coordinate order latitude, longitude or longitude, latitude?

The map tools expect latitude first, then longitude — for example 48.8584, 2.2945. Note that GeoJSON and many APIs use the opposite order (longitude, latitude), which is a common source of pins landing in the wrong place.

Which map provider do these tools use?

Maps are rendered with OpenStreetMap tiles, shown with the required attribution. OpenStreetMap is an open, community-maintained map of the world.