I am glad it is useful. I also have ME, and will have NH soon. I monitor this forum and will try to answer your questions promptly.
Savage-Have you continued your work on NH? I've pulled down GeoTIFF and Arc data, but can't get it converted with DEM2TOPO or Global Mapper following the tutorial on this site. DEM2TOPO crashes on memory (each of 15 GeoTIFFs >250MB). Per Oz' suggestion, I'm about to try gdal_contour. If you've already crunched NH, I'll hold off.
If not, I have a question for Oz: Using gdal_contour, do I need to follow steps similar to the following, given that I'd like an end result like I'd expect from DEM2TOPO with 400 ft major intervals, 200 ft intermediate intervals, and 20 foot minor intervals?
1. Navigate to the directory containing GeoTIFF DEM file.
2. Convert the DEM elevation units from meters to feet:
$ gdal_translate -scale 0 10000 0 32808.399 29901365.tif feet.tif
3. Build major contours (400-foot interval):
$ gdal_contour -a elev -i 400 feet.tif major.shp
4. Build intermediate contours (200-foot interval, adjust):
$ gdal_contour -a elev -i 200 feet.tif inter.shp
5. Build minor contours (20-foot interval, adjust):
$ gdal_contour -a elev -i 20 feet.tif minor.shp
Thanks very much for the help.