For the interpretation of bird observations, I need to identify the position on a GPS-track (gpx-files), from which the position of a bird observation (other gpx-waypoint layer) was recorded.
The tracks are recorded on an Android device with the Locus app. When a bird is observed, a new point is created on the map in a different point layer.
For the interpretation of the findings later, it would be nice to be able to identify the position from where the observation was taken.
I am looking for ways to develop a tool, where one can select a point in the bird layer, click a button, and the corresponding track points are somehow highlighted.
To start with, I need to find out in general, how I can do a selection query across two layers with the value taken from a selected feature in the first layer. The next problem would then be, that the timestamps of both layers are never completely the same, as you can see in the example, so in most cases, the exact time of the observation will be between two track points, so a hard comparison of the two layers is not possible.