Axis order
Which axis comes first for coordinates, commonly x then y, but some services and standards use latitude first.
Category: CRS & Coordinates · Also known as: axis swapping, x/y vs y/x
Definition (expanded)
Axis order describes whether coordinates are interpreted as (x, y) or (y, x). GeoJSON uses (x, y). Some OGC services, especially WMS 1.3.0 in certain CRS definitions, can be confusing about axis order. If a layer looks transposed, axis order is a prime suspect.
Related terms
Longitude/Latitude order (lon, lat)The coordinate order used by GeoJSON and most WKT-in-EPSG:4326 workflows: X is longitude, Y is latitude.CRS (Coordinate Reference System)A definition of how coordinates map to real locations on Earth, including projection, datum, and units.EPSG:4326 (WGS84 lon/lat)A common coordinate reference system using longitude/latitude on WGS84.WMS (Web Map Service)An OGC standard for serving map images over HTTP, often used as raster overlays.