combine.buffers function

Create a new, (non circular) composite buffer from a list of existing buffers.

Creates a new bathy object from a list of existing buffers of compatible dimensions.

combine.buffers(...)

Arguments

• ...: 2 or more buffer objects as produced by create.buffer. All bathy objects within the buffer objects must be compatible: they should have the same dimensions (same number of rows and columns) and cover the same area (same longitudes and latitudes).

Returns

An object of class bathy of the same dimensions as the original bathy objects contained within each buffer objects. The resulting bathy object contains only NAs outside of the combined buffer and values of depth/altitude inside the combined buffer.

Author(s)

Benoit Simon-Bouhet

See Also

create.buffer, plot.buffer, plot.bathy

Examples

# load and plot a bathymetry
data(florida)
plot(florida, lwd = 0.2)
plot(florida, n = 1, lwd = 0.7, add = TRUE)

# add points around which a buffer will be computed
loc <- data.frame(c(-80,-82), c(26,24))
points(loc, pch = 19, col = "red")

# create 2 distinct buffer objects with different radii
buf1 <- create.buffer(florida, loc[1,], radius=1.9)
buf2 <- create.buffer(florida, loc[2,], radius=1.2)

# combine both buffers
buf <- combine.buffers(buf1,buf2)

## Not run:

# Add outline of the resulting buffer in red 
# and the outline of the original buffers in blue
plot(outline.buffer(buf), lwd = 3, col = 2, add=TRUE)
plot(buf1, lwd = 0.5, fg="blue")
plot(buf2, lwd = 0.5, fg="blue")
## End(Not run)