potential.cov {RGeostats}R Documentation

Establish the covariance in the Potential CoKriging System

Description

Establish the covariance in the Potential CoKriging System

Usage

potential.cov(model,
              db1 = NA, type1 = 1, iech1 = 1,
              db2 = NA, type2 = 1, iech2 = 1,
              x10 = NA, x1p = NA, tx1 = NA, 
              x20 = NA, x2p = NA, tx2 = NA, verbose = FALSE)

Arguments

model

The model-class containing the Model for the Potential variable. For more information check check.model.

db1

The db-class containing the information at first point. This file is optional: it can be replaced by specifying explicitely the arguments 'type1', 'x10', 'x1p' and 'tx1'.

type1

When 'db1' is not provided, you may designate the type of information available at the first point. It can be

  • 1 Gradient

  • 2 Tangent

  • 3 IsoPotential

iech1

Rank of the sample within 'db1' (if specified).

db2

The db-class containing the information at second point. This file is optional: it can be replaced by specifying explicitely the arguments 'type2', 'x20', 'x2p' and 'tx2'.

type2

When 'db2' is not provided, you may designate the type of information available at the second point. It can be

  • 1 Gradient

  • 2 Tangent

  • 3 IsoPotential

The sign is changed if the second point is a target.

iech2

Rank of the sample within 'db1' (if specified).

x10

When 'db1' is not provided and if 'type1' is equal to 3 (IsoPotential), this argument corresponds to the coordinates of the Reference sample belonging to the same isopotential as the Target sample. This information concerns the first point of the covariance calculation.

x1p

When 'db1' is not provided, this argument corresponds to the coordinates of the Target sample. This information concerns the first point of the covariance calculation.

tx1

When 'db1' is not provided, this argument corresponds to the coordinates of the Target sample. This information concerns the first point of the covariance calculation.

x20

When 'db2' is not provided and if 'type2' is equal to 3 (IsoPotential), this argument corresponds to the coordinates of the Reference sample belonging to the same isopotential as the Target sample. This information concerns the second point of the covariance calculation.

x2p

When 'db2' is not provided, this argument corresponds to the coordinates of the Target sample. This information concerns the second point of the covariance calculation.

tx2

When 'db2' is not provided, this argument corresponds to the coordinates of the Target sample. This information concerns the second point of the covariance calculation.

verbose

Verbose flag

Value

This function returns a matrix of covariance terms corresponding to the relevant lines and columns in the Potential CoKriging System. Its dimension depends on the type of data provided at the two points, and on the space dimension.

[Package RGeostats version 14.0.10 Index]