mrmidi: Can I ask you a couple of questions please about DEM?
For fun, I'm writing a program that reads DEM files (SRTM on Earth Explorer) and generates the file needed for AH elevation. (I'm also going to have it algorithmically generate the gndtype file, for example confining farmland to low flat lands and keeping if off steep slopes, making steep slopes rock and high alt slopes rock/snow etc.). However, there's a problem with water. While the DEMs are edited to make all ocean at alt=0 it doesn't follow that all alt=0 is ocean. In fact there's tons of areas of what should be land that are zero or even negative alt (Netherlands, for example). How do you set water? Do you do it manually? (There are separate SRTM Water Body Data files, but they are in an inconvenient format, i.e. vectors, and look hard to use.)
Second: what projection do you use? I used a simple projection that preserves distances, but distorts shape. Do you use UTM? -Thanks