Add elevation data from public AWS terrain tiles to long/lat coordinates of animal gps data
lookup_elevation_aws(anidf, zoom = 11, get_slope = TRUE, get_aspect = TRUE)
animal tracking dataframe
level of zoom, defaults to 11
logical, whether to compute slope (in degrees), defaults to true
logical, whether to compute aspect (in degrees), defaults to true
original data frame, with Elevation column appended