GPX altitude fine tuning

sl91 shared this question 3 months ago
Answered

Hi,

I use Locus Pro for hiking together with Lomaps and the SRTM files already stored on my smartphone (Samsung Galaxy S8+). Managing the altitude is really a mess but not because of Locus. The GPS altitude value is of course not so precise. Using the embedded barometer allow a very fine control of the altitude variation but not of the absolute value. So one has to adjust the offset depending on the ambiant pressure of the day and may of the hour when the weather is changing. So my question is the following:

Is it possible to setup Locuspro in a way that at the very begining of a hike, it uses automatically the altitude provided by the .hgt file, i.e. by the srtm file without the need of any manipulation of the software other than starting the record process. If yes, is it possible to tell Locus Pro to do so only if the GPS lateral precision in better than xx meters (i.e. a threshold value) ?

Also, is it possible to tell LP to replace all the altitude values by the ones extracted from the hgt file just before recording the hiking gpx file ?

Many thanks for any answer


Best regards


sl91

Comments (1)

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"Is it possible to setup Locus Map in a way that ... it uses automatically the altitude provided by the .hgt file, i.e. by the srtm file ..."

According to the documentation, it uses GPS altitude or SRTM files when you set the Altitude Manager to Automatic. However, I don't know how it decides to switches from GPS altitude to SRTM.

"Is it possible to tell Locus Pro to do so only if the GPS lateral precision in better than xx meters ... ?"       

I don't think that's possible.

"Is it possible to tell LP to replace all the altitude values by the ones extracted from the hgt file just before recording the hiking gpx file ?"

It can replace all recorded GPS altitudes, with values from SRTM, when the recorded track is saved to storage. It cannot replace the values while the track is being recorded. See documentation: SRTM data.