db.grid.sampling {RGeostats}

R Documentation

Sampling a Grid along a segment

Description

Sampling a Grid along a segment

Usage

db.grid.sampling(dbgrid, x1, x2, cuts = 0, ndisc = 100)

Arguments

dbgrid	The db-class (organized as a grid) which contains the target variable (Z locator) to be sampled.
x1	First end-point of the segment. The number of coordinates should match the dimension of 'dbgrid'.
x2	Second end-point of the segment. The number of coordinates should match the dimension of 'dbgrid'.
cuts	Array of cutoff values.
ndisc	Number of discretization points generated along the segment.

Details

This function considers the segment [x1,x2], discretized into 'ndisc' intervals. At each endpoint of the discretized interval, the target variable (informed in the grid) is interpolated (using the multi-linear interpolation). Then each cutoff value is compared to this pair of interpolated values. If the cutoff lies between these two values, the coordinates of the intersection are returned.

Value

A matrix with dimension:

• Number of rows = Number of intersections of the segment with the set of cutoff values

• Number of columns = Space dimension + 1

Each row gives the coordinates of an intersection of the initial segment with a cutoff value: its rank is given in the last column.

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