Coordinate System

The Geographical Coordinate System follows the same principles of the Cartesian Coordinate System. It allows us to uniquely identify each location on the Earth via a set of numbers. These numbers are expressed in the order - Longitude, Latitude, Elevation.

Coordinates

Longitude is a geographic coordinate that specifies the east-west position of a point on the earth's surface.

Latitude is a geographic coordinate that specifies the north-south position of a point on the earth's surface.

Elevation is a geographic coordinate that specifies the vertical distance from the sea-level (in meters?).

In 2D space, we will only be using Longitude and Latitude.

The ol.Coordinate definition represents a coordinate which is simply an alias for Array of Numbers.

Longitude-Latitude

We've usually referenced Geographical Coordinates as (Latitude,Longitude) and the axis of Cartesian Coordinate's as (X,Y). If you look closely, you'll notice that the Longtiude is actually on the X axis where as the Latitude is on the Y axis. Since the map is in a Cartisian Coordinate System, we want to be able to think in terms of (X,Y). In order to standardize, we reference Geographical Coordinates as (Longitude,Latitude) which is synonymous to (X,Y).