CRS

A Coordinate Reference System (CRS) tells you how to interpret coordinates on a map.

It defines:

• The coordinate system (e.g., latitude/longitude vs. x/y)
• The map projection or datum (how the Earth’s shape is transformed to a flat map)
• The units and axes (degrees, meters, etc.)

So the same numeric coordinates can point to different places depending on the CRS. The Tygron Platform uses to EPSG (European Petroleum Survey Group) number to identify the CRS in API Endpoints.

Common examples

• Web Mercator (EPSG:3857): x/y in meters for many web maps and default in the Tygron Platform.
• WGS 84 (EPSG:4326): longitude/latitude in degrees (used by GPS and GeoJSON).
• RD New (EPSG:28992): coordinates in meters (Easting, Northing), based on the Dutch Amersfoort datum.

See also

• GeoJSON
• Endpoints