db.grid.init {RGeoS}R Documentation

Initialize a Grid Db

Description

Initialize a Grid Data Base calculated from an already existing Db

Usage

db.grid.init(db, nodes = NA, origin=NA, extend=NA, margin=0)

Arguments

db

The db-class Class describing the already existing Db used to determine the offset of the new Db

nodes

Array containing the number of cells on each axis. If not defined, a constant value is provided, equal to 10. If a constant is entered, this same value is used for each axis.

origin

When provided, this array overwrites the origin as calculated from the input Db

extend

When provided, this array overwrites the extension as calculated from the input Db

margin

This array provides the percentage by which the initial extension must be multiplied to calculate the margin. The margin is expressed in percentage. This may be either an array (of dimension ndim) or a constant value which will be considered for each direction. If the argument 'origin' is not provided, the minimum (along each axis) is decreased by this margin. If the argument 'extend' is not provided, the extension (along each axis) is increased by this margin multiplied by 1 (if the origin is defined) or 2 otherwise.

Value

The db-class newly created


[Package RGeoS version 9.1.1 Index]