latitude and longitude
Latitude and longitude are a pair of numbers (coordinates) used to describe a position on the plane of a geographic coordinate system. The numbers are in decimal degrees format and range from -90 to 90 for latitude and -180 to 180 for longitude.
For example, Washington DC has a latitude
38.8951 and longitude
-77.0364. In API calls you will often see the numbers placed together and separated by a comma:
-77.0364,38.8951. In some cases, altitude can be included as a third value.