cloud.calc {RGeostats} | R Documentation |
Variogram Cloud calculation
cloud.calc(db, dbout = NA, dirvect = NA, lagmax = NA, varmax = NA, lagnb = 100, varnb = 100, toldis = 0.5, tolang = NA, bench = 0, cylrad = 0, opt.code = 0, tolcode = 0, dates = NA, flag.ask=FALSE, ...)
db |
The |
dbout |
The |
dirvect |
The directions in which the variogram must be calculated.
For more information, refer to |
lagmax |
Maximum distance value for variogram cloud calculation. This value is disregarded when the argument dbout is provided. |
varmax |
Maximum variogram value for the variogram cloud calculation. This value is disregarded when the argument dbout is provided. |
lagnb |
Number of steps for the variogram cloud calculation along the distance axis. |
varnb |
Number of steps for the variogram cloud calculation along the variogram axis. |
toldis |
Tolerance on the distance, expressed as a percentage of the lag. |
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 |
When defined and positive, a par is discarded if the separation distance along the third axis is larger than 'banch'. |
cylrad |
When specified and positive, a pair is discarded if the seperation distance in the plane orthogonal to the calculation distance is larger than 'cylrad'. |
opt.code |
Option concerning the sample codes for constituting pairs:
|
tolcode |
Maximum distance between the codes of the two samples. |
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:
|
flag.ask |
When TRUE, the variogram cloud is plotted. The user may then digitize a Polygon in order to identify the pairs which belong to this polygon. This operation is repeated until the user stops it. |
... |
Arguments passed to the functions |
The db-class
organized as a regular 2-D grid where
the variogram cloud is calculated. When no pair is obtained for
a given cell, the value is set to FFFF.