GpsFiltering

Keybinding Markup

---
title: GpsFiltering
---

# Filtering

Doesn't seem to be a reliable way to filter high velocity points.

Take successive derivatives of all points and filter on that?

*   Comment out the bogus points in the gpx 
*   Use gpxplot.py to check for velocity peaks quickly

## Segmenting

Splits tracks at long breaks (e.g. lunch).

Split after 30mins:

$ gpsbabel -i gpx -f in.gpx -x track,pack,split=30m -o gpx -F out.gpx

## Waypoints

name
:   short descriptive name

cmt
:   original GPS name

desc
:   "Day x: Description"

sym
:   Garmin waypoint symbols

### Symbols

[Garmin GPS III+][1] ![Garmin GPS III+ icons][2]

Flag
:   miscellaneous

Drinking Water
:   Water stops, springs, etc

Swimming Area
:   Lakes

Residence
:   Overnight

Campground
:   Overnight

Picnic Area
:   Lunch stops

Crossing
:   Railway crossings

# Rendering

*   GpsVisualizer 
*   Google Maps 
    *   Paste the gpx URL in the google maps search box

# Links

*   [GPS Visualizer][4] 
*   [gpxplot][5]

[1]: http://www.wideman.org/files/icons.txt
 [2]: http://www.wideman.org/images/gpsicons.gif "Garmin GPS III+ icons"
 [4]: http://www.gpsvisualizer.com
 [5]: http://code.google.com/p/gpxplot/

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