Bird trajectory

An example GPS track of a stork niclas and an example Digital Elevation Model dem are included in the package. The DEM is a snippet from the SRTM 90m Digital Elevation Database v4.1 from CGIAR-CSI and the stork track is a subset of the data in the study LifeTrack White Stork SWGermany 2014-2017 (Movebank Study ID 21231406) from the Movebank Data Repository.

The area covered by the test data is the Swiss midland. The example track is a data.frame with coordinates in x, y and z. The x and y coordinates are in the CH1903+ / LV95 (EPSG:2056) reference system.