vmap.calc {RGeostats}R Documentation

Calculate the Variogram Map for a set of variables on a set of isolated points

Description

Calculate the Variogram Map for a set of variables on a set of isolated points

Usage

vmap.calc(db, dbmap = NA, nx = 10, ny = 10, dx = NA, dy = NA, 
	      calcul = "vg", radix = NA, modify.target = db.locmod())

Arguments

db

The db-class (organized as a set of isolated points) containing the variables used for the calculation the Variogram Map.

dbmap

The db-class (organized as a grid) which will contain the Variogramp Map results. If not provided, the 'dbmap' file is created by this procedure. Otherwise the results of this calculation will be added as new variables.

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)

dx

Gives the mesh of the Variogram Map along the first axis. If not provided, it is calculated as proportion of the field elongation along the first direction.

dy

Gives the mesh of the Variogram Map along the second axis. If not provided, it is calculated as proportion of the field elongation along the second direction.

calcul

Character string giving the type of structure to compute:

  • vg : Variogram

  • cov : Covariance (Centered)

  • covnc : Non-centered Covariance

  • covg : Transitive Covariogram

  • mado : Madogram (Variogram of order 1)

  • rodo : Rodogram (Variogram of order 1/2)

  • poisson : Variogram of a Poisson-weighted variable

radix

Radix of the name given to the variables stored in the Variogram Map Grid

modify.target

Decides whether or not the newly created variables will have their locator defined or not. For more information, see db.locmod.

Value

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


[Package RGeostats version 11.1.2 Index]