sperich (version 1.5-8)

fill.Areas: Fill Algorithm

Description

This function fills all bounded areas in a grid.

Usage

fill.Areas(grid, landwatermask)

Value

The grid with filled areas.

Arguments

grid

A grid in which the areas should be filled. Cells with values greater than zero represent the bounds, cells with values lower or equal zero will be filled with value 1 if they are bounded.

landwatermask

A grid containing the land-water-information of the observed area. If a grid cell containes no land, the value of the cell in the landwatermask is -1, otherwise it is 0. Cells with negative values will not be filled.

Author

Maximilian Lange, Sven Lautenbach

Details

This function fills all bounded areas in a grid.

Examples

##initialize data
m <- matrix(0,10,10)
m[2:8,2] <- 1
m[2:8,8] <- 1
m[2,2:8] <- 1
m[8,2:8] <- 1

##initialize mask (in this case: empty mask)
mask <- matrix(0,10,10)

##calculate the distance of the two points
m <- fill.Areas(m, mask)
image(m)