OkMap Tutorial - Cleaning and Analyzing a GPS Track

OkMap tutorial for importing, cleaning, and analyzing a GPS track recorded in the field using DEM data.
In this video we show how to correct elevation data, remove redundant points, and obtain reliable statistics and graphs of the route.
The result is an optimized and accurate track, ready for further analysis or use on GPS devices.

Before you start:

To better understand this tutorial, it is recommended to watch the following video first:

Download   Manual

Procedure:

  • Open a georeferenced raster map or a web map
  • Download elevation data (DEM)
  • Load the track recorded from the GPS
  • Correct elevation using DEM data
  • Remove redundant or incorrect track points
  • Simplify the track if necessary
  • Analyze route statistics
  • Analyze elevation profile graphs
  • Save the cleaned track as a new GPX file

Tips:

  • Use elevation correction to improve profile accuracy
  • Remove GPS point clusters generated during pauses
  • Reduce points only enough to preserve route detail
  • Compare recorded track with the map to detect GPS errors

Common errors:

  • Not correcting GPS track elevation
  • Not removing point clusters generated during stops
  • Removing too many points and losing route accuracy
  • Not verifying consistency between track and real route