Only features that have a geometry that intersects the bounding box are
selected. The bounding box is provided as four or six numbers,
depending on whether the coordinate reference system includes a
vertical axis (elevation or depth):
- Lower left corner, coordinate axis 1
- Lower left corner, coordinate axis 2
- Lower left corner, coordinate axis 3 (optional)
- Upper right corner, coordinate axis 1
- Upper right corner, coordinate axis 2
- Upper right corner, coordinate axis 3 (optional)
The coordinate reference system of the values is WGS84
longitude/latitude (http://www.opengis.net/def/crs/OGC/1.3/CRS84).
For WGS84 longitude/latitude the values are in most cases the sequence
of minimum longitude, minimum latitude, maximum longitude and maximum
latitude. However, in cases where the box spans the antimeridian the
first value (west-most box edge) is larger than the third value
(east-most box edge).
If a feature has multiple spatial geometry properties, it is the
decision of the server whether only a single spatial geometry property
is used to determine the extent or all relevant geometries.
Example: The bounding box of the New Zealand Exclusive Economic Zone in
WGS 84 (from 160.6°E to 170°W and from 55.95°S to 25.89°S) would be
represented in JSON as [160.6, -55.95, -170, -25.89] and in a query as
bbox=160.6,-55.95,-170,-25.89.