| rast.grad {ctmcmove} | R Documentation |
Creates gradient rasters from a raster object.
Description
This function takes a raster stack or raster object and creates two matrices for each raster layer, one which contains the x coordinates of the gradient of the raster layer and one which contains the y coordinates of the gradient of the raster layer.
Usage
rast.grad(rasterstack)
Arguments
rasterstack |
A raster layer or raster stack from package "raster". |
Details
The gradient is computed using the "terrain" function in raster.
Value
xy |
A matrix of x and y coordinates of each cell in the raster stack or raster layer. The order is the order of the cells in the raster object. |
grad.x |
a matrix where each column is the x-coordinates of the gradient for one raster layer |
grad.y |
a matrix where each column is the y-coordinates of the gradient for one raster layer |
rast.grad.x |
A raster stack where each raster layer is the x-coordinates of the gradient for one covariate |
rast.grad.y |
A raster stack where each raster layer is the x-coordinates of the gradient for one covariate |
Author(s)
Ephraim M. Hanks
References
Hanks, E. M.; Hooten, M. B. & Alldredge, M. W. Continuous-time Discrete-space Models for Animal Movement The Annals of Applied Statistics, 2015, 9, 145-165
Examples
## For example code, do
##
## > help(ctmcMove)