sim.glidingSoaring.3d: Simulates 'gliding & soaring' track with a given number of...

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

Simulates 'gliding & soaring' track with a given number of gliding steps

Description

Creates a conditional empirical random walk in gliding mode, between a start and end point. The walk is performed on a MODE layer and, if provided, additionally on a background and digital elevation layer. The gliding is simulated with sim.cond.3d and soaring with sim.uncond.3d, therefore soaring is not restricted towards the target and can happen completly free as long as there are good thermal conditions. It is important to extract for every mode in the MODE raster layer a corresponding densities object with get.densities.3d and pass them to the function.

Usage

sim.glidingSoaring.3d(
  MODE,
  dGliding,
  dSoaring,
  qGliding,
  start = c(0, 0, 0),
  end = start,
  a0,
  g0,
  error = TRUE,
  smoothTransition = TRUE,
  glideRatio = 15,
  DEM = NULL,
  BG = NULL,
  verbose = FALSE
)

Arguments

MODE	raster layer containing the number/index of the mode, which should be used at each location
dGliding	density object returned by the get.densities.3d function for gliding mode
dSoaring	density object returned by the get.densities.3d function for soaring mode
qGliding	the Q probabilites for the steps in gliding mode (qProb.3d)
start	numeric vector of length 3 with the coordinates of the start point
end	numeric vector of length 3 with the coordinates of the end point
a0	initial incoming heading in radian
g0	initial incoming gradient/polar angle in radian
error	logical: add random noise to the turn angle, lift angle and step length to account for errors measurements?
smoothTransition	logical: should the transitions between soaring and the following gliding sections be smoothed? Recommended to avoid dead ends
glideRatio	ratio between vertical and horizontal movement, by default set to 15 meters forward movement per meter vertical movement
DEM	raster layer containing a digital elevation model, covering the area between start and end point
BG	a background raster layer that can be used to inform the choice of steps
verbose	logical: print current mode used?

Value

A 'soaring-gliding' trajectory in the form of data.frame

Note

The MODE raster layer must be in the following structure: Gliding pixels have the value 1 and soaring pixel the values 2. NA's are not allowed in the raster.

Examples

print("tbd.")

eRTG3D documentation built on March 18, 2022, 6:11 p.m.