See Also
The Great Circle Distance Calculation allows the calculation of distance between two points of longitude, latitude. The Great Circle Distance Calculation assumes that the earth is a sphere and makes no adjustments for the actual flattening of the earth.
The calculation consists of the following parameters:
The distance in kilometers between the starting and ending location is determined from the following equation:
This calculation is used with several GIS tools to determine the distance between two locations or facilities on a diagram.