geometry.calc {RGeostats}R Documentation

Calculate the Geometry for Variogram calculation

Description

Calculate the Geometry for Variogram calculation

Usage

geometry.calc(db, dirvect = NA, lag = NA, toldis = 0.5, tolang = NA,
              bench = 0, cylrad = 0, nlag = NA, breaks = NA,
              opt.code = 0, tolcode = 0, dates = NA)

Arguments

db

The db-class containing the data information used to calculate the experimental variogram. The variograms are calculated for the set of "z*" variables present in the DB.

dirvect

The directions in which the variogram must be calculated. For more information, refer to get.directions

lag

Array containing the distance lags for each calculation direction. If no corresponding lag is not defined, a default lag is calculated so that the maximum distance is equal to half of the field diagonal. For one distance, if the lag is not defined, it is set to the default lag.

toldis

Tolerance on the distance, expressed as a proportion of the lag. This parameter is only used in the case of regular lags.

tolang

Array containing the angular tolerance for each calculation direction. If no angular tolerance is not defined, a default tolerance is calculated as one half of the angle. For one direction, if the angular tolerance is not defined, it is set to the default tolerance.

bench

Array containing the bench separation tolerance for each calculation direction. When bench is defined and positive, a pair is discarded if the separation distance between the two points along the third axis is larger than 'bench'.

cylrad

Array containing the cylrad tolerance for each calculation direction. When specified and positive, a pair is discarded if the separation distance in the plane orthogonal to the calculation distance is larger than 'cylrad'.

nlag

Array containing the number of lags for each calculation direction. If not defined, the defaulted number of lags is set to 10. For one direction, if the number of lags is not defined, it is set to 10.

breaks

Vector giving the boundaries of irregular distance lags. For multidrectional computations, breaks is either: a vector (The breaks are then the same for all directions) a list of vectors of the breaks for each direction. If provided, nlag is adapted to the breaks. Intervals are open left and closed right (e.g ]0;15]).

opt.code

Array containing the option concerning the use of the code for each direction. This option defines the strategy for the code usage when considering a pair of samples:

  • 0 : a pair of samples is selected whatever their codes (if active)

  • 1 : a pair is retained if the code is active in the data base and the codes of the two samples are closer than tolcode

  • 2 : a pair is retained only if the codes of the two samples are different

tolcode

Array giving the maximum distance between the codes of the two samples for each direction.

dates

When defined and if the 'time' locator is defined, this value corresponds to the bounds of the Date Intervals. It is organized as follows:

  • The lower bound of the first Date Interval

  • The upper bound of the first Date Interval

  • The lower bound of the second Date Interval

  • The upper bound of the second Date Interval

  • ...

Value

A list containing the following arguments:

[Package RGeostats version 14.0.10 Index]