Time passes and our tool-set steadily improved. As you say, most of your original post has been overtaken by better methodology.RSAdam wrote:Does noone think its time to revamp my initial tutorial and use updated links and processes? I seem to remember someone saying years back that some of the steps are now irrelevant.
I would especially avoid the old NASA "one degree squares" sites to obtain DEM's. By mutual agreement, the USGS has taken maintenance on, and they have removed discontinuities, holes and spikes. This illustrates the problem (screenshot link shows the difficulty):
http://forums.uktrainsim.com/viewtopic. ... 43#p968743
This was the fix:
http://forums.uktrainsim.com/viewtopic. ... 53#p969353
You can note that GSX1400 said "To be honest, I can't remember where I got the data from, I followed all of the links in "Terraform your UK Route in 5 Easy Steps [using DEM data]" until I found one that works." and "I think it would be useful for the article "Terraform your UK Route in 5 Easy Steps [using DEM data]" to be updated..."
If you have registered DEMEX, you need do nothing but ask DEMEX to get your SRTM 3 arc sec DEM's for you. The front end of the USGS site is bypassed and a couple of seconds later you have a download page, exactly tailored to your route's quad tree.
If you have not registered DEMEX, this post shows you how to bypass the USGS front end on your own and go directly to a download:
http://forums.uktrainsim.com/viewtopic. ... 60#p740360
Newer methods are in this topic, but they're difficult to find. To wit...
http://forums.uktrainsim.com/viewtopic. ... 64#p969664