Data got collected in the field by walking trails and
clicking waypoints and with the tracking function.
We followed the existing trail system in Dec 2010 and January 2011.
Data were downloaded into ArcGIS using the DNRGarmin software and the GarminGPS Mapsource for a check.
Earlier map versions exist, including work by Falk Huettmann. Here we used the hardcopy one by Bernado Urbani, Franco Urbani, Jonathan Mesen Rui from Jan-Feb 2008, and Paul Garber, and which was re-digitized by us for a baseline comparison.