vmap.grid {RGeoS} | R Documentation |
Calculate the Variogram Map for a set of variables in a Grid Data Base
vmap.grid(dbgrid, dbmap=NA, nx = 10, ny = 10, nz=10, calcul="vg",flag.fft=TRUE, radix = NA, modify.target = TRUE)
dbgrid |
The |
dbmap |
The |
nx |
Gives the dimension of the Variogram Map along the first axis (2*nx+1) |
ny |
Gives the dimension of the Variogram Map along the second axis (2*ny+1) |
nz |
Gives the dimension of the Variogram Map along the third axis (2*nz+1) |
calcul |
Character string giving the type of structure to compute:
|
flag.fft |
When TRUE, launch the calculation using the specific calculations using FFT tgransforms (only available for 2-D grids) |
radix |
Radix of the name given to the variables stored in the Variogram Map Grid |
modify.target |
When TRUE, the Variogram Map results are set as new target variables in the output DB. |
The output consists of a new Grid Data Base with several new variables:
VMAP |
Variables containing the variogram map results |
NB |
Variables containing the number of pairs |