Locus 330 altitude management
Today, I made a hike (about 9 km). I recorded the GPX file using Locus Pro 330 installed on my Samsung Galaxy S8+ (Oreo) smartphone. My goal was to record of the most precise possible altitude. My altitude manager settings are:
-Parameters: No offset, SRTM: replace GPS values, use the pressure sensor, light filter
I thought that this way, Locus will first use the altitude value extracted from the srtm file and from that point will use the pressure sensor to record some real time altitude values. Also, I read that locus will check each two hours the right value of the altitude from the srtm file and perform some correction in needed in order to avoid the problems related to the weather (and the related ambiant pressure) change during the day. Am I right ?
Well I recorded my hike and exported the gpx corresponding file. I opened it using one of my favorite softwares, i.e. MyTourbook in order to analyze the altitude data. I noticed 2 issues.
1. Locus pro generated a relatively huge jump in the altitude value after 1h20 of walk. This is shown by the green curve. The brown curve corresponds to the strm values.
2. One can also clearly see that the altitude value is really exact at the starting point and drifts too much with the time. Locus Pro reads correctly the first value but what happens after that ?
I have attached a picture that shows this effect