A pair of values in map units that define the width and height of a projected coordinate span.
- MapKit JS 5.0+
If you project the curved surface of the globe onto a flat surface, you get a 2D version of a map where longitude lines appear to be parallel. Such maps are often used to show the entire surface of the globe all at once. A
mapkit data structure represents a horizontal and vertical distance as measured on this 2D map.