OpenDEM Tracker

GPS tracking and height recording based on the barometric sensor of your mobile device.

For this app, a GPS receiver and a barometric sensor are required.

An Internet connection is required when:
- the recorded data should be published under the Open Database License (ODbL) on the OpenDEM server.
- weather stations should be used as reference for correction of the data*.
- a SRTM elevation service should be used for the computation of the initial height value.
*Only available for Germany and the surrounding area. For more information, see here.

Nevertheless, you could use the data of this app for post processing at any place on Earth. The recorded data could be saved directly on your mobile device.

Be aware that this is an app with experimental status. With the present reference data of the weather APIs, it is not possible to create a reliable correction of the data over longer time periods.

There are also other conditions which could lead to improper results:
- relief, e.g. at the windward and leeward side of mountains
- atmospheric instability, e.g. thermal bubbles
- deviations from the standard atmosphäre, e.g. important for the calculation of the barometric scale factor

See here for further information: www.opendem.info.

Nonetheless, the first 10 minutes of every recorded track could be a starting point to build up an OpenDEM.

Recent changes:
- Link to the online correction tool with manual reference data
- List other weather conditions which could lead to improper results
- Patched null pointer exception if no barometric sensor is available
- Corrected swapped lat lon header entries when saving on device