GPS trace processing.md

1. Remove waypoints and imprecise points with GPSBabel:

   gpsbabel \
     -i 'gpx' -f 'original/2021-08-23T21-35-41Z Mary Avenue Trail.gpx' \
     -x 'nuketypes,waypoints' \
     -x 'discard,hdop=2' \
     -o 'gpx' -F '/tmp/2021-08-23T21-35-41Z Mary Avenue Trail.gpx'

2. Remove redundant points with gpx reduce:

   gpx_reduce \
     --dist '0.50' \
     --maxsep '2' \
     --bend '2' \
     --out 'filtered/2021-08-23T21-35-41Z Mary Avenue Trail.gpx' \
     '/tmp/2021-08-23T21-35-41Z Mary Avenue Trail.gpx'

3. Remove clusters with GpsPrune.

4. Upload to OpenStreetMap:

   https://www.openstreetmap.org/user/Andrew%20Kvalheim/traces/3798764