how does "your" asc compare/convert to dems ?

http://en.wikipedia.org/wiki/Digital_elevation_model

asking partly because I have never heard of ASC before but have lots of DEMs that I have used in Terragen

be nice if you could expand your idea enough to cover other types of height data ?

is any other types of height data available for other countries ???

have fun and luck with your project !!! look forward to seeing more