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I have them all in one file and they overlay onto topo or metroguide perfectly.  Problem is, they're just a bunch of tracks hooked together.  So to make them stand out on the map, I have to click on each of about 20 tracks to change the color (Mapsource default seems to be black data points and segments, and white background for tracks).  I have no interest in the properties of the original tracks (i.e., what the date was, how fast I was going, etc.), so I don't mind losing those properties.  This is going to become a real problem as I continue to incorporate more tracklogs for the rest of the trail system.

I've been gathering tracklogs of our town's multi-use trail system with the intention of making both paper and transparent GPS maps.  My immediate challenge is managing the tracklogs.  How does one take a bunch of tracklogs and "merge" them into one so I can manipulate the entire trail system easily as one tracklog?  I've been using GPS Trackmaker (free edition) to clean up and sanitize my tracklogs.

Any and all insights greatly appreciated!

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.

I pulled down New Hampshire today - 14 GeoTIFF files on the order of 260MB per file.  I've been waiting 2 1/2 hours for DEM2TOPO to load the first one so I can do the conversion.  It's not apparent that it's even attempting to load it and still indicates "Ready" in the lower left hand corner.  Do I need to pull the plug on this and drop $250 GlobalMapper?