Class Geography.Position

Description

This class contains a geographical position, ie a point on the earths surface. The resulting position object implements comparision methods (__hash, `==, `< and `>) so that you can compare and sort positions as well as using them as index in mappings. Comparision is made primary on latidue and secondly on longitude. It does not currently take the ellipsoid into account.

It is possible to cast a position into an array, which will yield ({ float latitude, float longitude }), as well as into a string.

Variable lat: float Geography.Position.lat
Description: Latitude (N--S) of the position, in degrees. Positive number is north, negative number is south.

Variable long: float Geography.Position.long
Description: Longitude (W--E) of the position, in degrees. Positive number is east, negative number is west.

Variable alt: float Geography.Position.alt
Description: Altitud of the position, in meters. Positive numbers is up. Zero is the shell of the current ellipsoid.

Variable polar_radius: float Geography.Position.polar_radius
Description: The polar radius is how many meters the earth radius is at the poles (north-south direction).

Variable equatorial_radius: float Geography.Position.equatorial_radius
Description: The equatorial radius is how many meters the earth radius is at the equator (east-west direction).

Constant ellipsoids: constant Geography.Position.ellipsoids
Description: A mapping with reference ellipsoids, which can be fed to the UTM converter. The mapping maps the name of the ellipsoid to an array where the first element is a float describing the equatorial radius and the second element is a float describing the polar radius.