Thanks everybody for your help. This is how I interpet your answers.
If I do a terrain of length 20,000,000 triangles and width 20,000,00 triangles that should give me an area of 160 square meters is that right?, using a 2.54cm scale and presuming MED and WED both use same grid scale.
Windows XP SP3 Intel Dual Core CPU: E5200 @ 2.5GHz 4.00GB DDR3 Ram ASUS P5G41T-M LX PCIE x16 GeForce GTS 450 1Gb SB Audigy 4 Spyware Doctor with AntiVirus
