geometry.calc {RGeostats}  R Documentation 
Calculate the Geometry for Variogram calculation
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)
db 
The 
dirvect 
The directions in which the variogram must be calculated.
For more information, refer to 
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:

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:

A list containing the following arguments:
ndir Number of directions
ntot Total number of lags (cumulated over all directions)
npair Total number of pairs (cumulated over all lags of all directions)
nbydir Array giving the number of lags perfor each direction (Dimension: ndir)
nbylag Array giving the number of pairs for each lag and for each direction (Dimension: ntot)
tabech1 Array giving the rank of the first point of each pair of each lag of each direction (Dimension: npair). The rank is numbered starting from 1.
tabech2 Array giving the rank of the second point of each pair of each lag of each direction (Dimension: npair). The rank is numbered starting from 1.
tabdist Array giving the distance between the two points of each pair of each lag of each direction (Dimension: npair)