Google for .. “GIS inurl:blog.namran.net” will eventually bump onto this page.. http://blog.namran.net/2007/04/10/gis-again/ which is approximately two (2) years ago.. .. hehe.. since then , a lot of effort have been
Let’s say we want to reach somewhere at point Z. And our current location is at A. Somehow we first must get ourself to point B, then C,D,E,F and eventually