A point-to-point distance taken from a map does not provide a true measurement of the distance between those points; the intervening topography has to be taken into account...Calculating True Distance Over a Surface - Blogs -
Geologist, Geospatial Expert and TAP Certified GIS Trainer working as an Independant Consultant.
I have special interests in Geology, Exploration, Coordinate Reference Systems, Geodesy and Natural Science.