GEODIST: Stata module to compute geodetic distances

Abstract

geodist computes geodetic distances, i.e. the length of the shortest curve between two points along the surface of a mathematical model of the earth. By default, the Vincenty (1975) equations are used to compute distances on the WGS 1984 reference ellipsoid. Alternate ellipsoids can also be specified. geodist can also compute great-circle distances (where a sphere is used to approximate the shape of the earth).