I created this for a big project that I'm working on and I thought I'd share it for anyone else who is interested in playing it.
This mage is HUGE, 6000x2148. It is created at a 20m/tile scale. Uses USGS terrain data.
Altitude increments are biased towards the low end, the first few steps of altitude are in small increases, 0-10m, 10m-20m and then start to increase logarithmically as you get to the higher gradients such that the highest z-axis increases are 150m+ per level. This is due to the fact that the highest altitude on this map in reality is around +/- 1,800m.
Set water height to -9 for this map to be at the correct level.
Scale down the map or select a subsection to make a smaller map.
There are lakes in the mountains that will not render with water due to their altitude.
.PPM MAP FILE HERE:http://www.elvenorder.com/simutrans/maps/Fraser-Valley_6000x2148.rar
Vancouver looking from the south (picture is taken in an area in the top left of the map):