The hardware and bandwidth for this mirror is donated by dogado GmbH, the Webhosting and Full Service-Cloud Provider. Check out our Wordpress Tutorial.
If you wish to report a bug, or if you are interested in having us mirror your free-software or open-source project, please feel free to contact us at mirror[@]dogado.de.
Since movement in 2-D is a special case of movement in 3-D, the
eRTG3D
algorithm also supports two-dimensional simulations.
The underlying data structure of the algorithm remains in
three-dimensional, with the third dimension (z) being constant, as for
example zero. This approach guarantees a seamless transition between 2-D
and 3-D simulations. Therefore, two P and Q probabilities are be
extracted from 2D and 3D trajectories, then a combined simulation can
take place.
.3D <- sim.crw.3d(nStep = 100, rTurn = 0.99, rLift = 0.99, meanStep = 0.1) trajectory
To simulate in 2-D the third dimension of the trajectory is set to zero:
.2D <- trajectory.3D
trajectory.2D$z <- 0
trajectoryhead(trajectory.2D)
#> x y z
#> 1 0.00000000 0.00000000 0
#> 2 -0.04976943 0.03299199 0
#> 3 -0.09460812 0.06814134 0
#> 4 -0.13551572 0.10242178 0
#> 5 -0.16315900 0.11669027 0
#> 6 -0.19171655 0.13107099 0
If the original trajectory is already two-dimensional, a third column
z
has to be added:
trajectory.2D$z <- 0
.
Now the workflow is the same as in 3-D, described in the standard workflow vignette:
Note: Since it is not feasible to use a DEM
(DEM = demRaster
) in 2-D simualtions, the adding of a DEM
in the somulations will result in dead ends. A BG layer
(BG = bgRaster
) with a binary mask or continous
probabilities for the simulation area can be passed (e.g. water bodies,
nutrition sources, …).
.2D <- reproduce.track.3d(trajectory.2D) simulation
And plotting the results:
plot2d(trajectory.2D, simulation.2D, titleText = "2-D trajectory simulation")
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.