Example data
In eRTG3D: Empirically Informed Random Trajectory Generation in 3-D

knitr::opts_chunk$set(collapse = TRUE, comment = "#>")
options(knitr.table.format = "html", rmarkdown.html_vignette.check_title = FALSE)

library(eRTG3D)
library(raster)
library(sp)
set.seed(123)

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.

head(niclas)

Digital elevation model

The DEM is a rasterLayer of the raster package, it's Coordinate Reference System (CRS) is also CH1903+ / LV95. The stork flies from southwest to northeast, GPS fixes are collected every 15 minutes.