area.swin {ads}R Documentation

Area of a sampling window

Description

Function area.swin computes the area of a sampling window.

Usage

area.swin(w)

Arguments

w

an object of class "swin" defining the sampling window.

Details

For "simple" sampling windows, returns simply the area of the rectangle or circle delineating the study region.
For "complex" sampling windows, returns the area of the initial rectangle or circle, minus the total area of the triangles to remove (see swin).

Value

The area of the sampling window.

Author(s)

Raphael.Pelissier@ird.fr

See Also

swin.

Examples

  ## Not run: rectangle of size [0,110] x [0,90]
  wr<-swin(c(0,0,110,90))
  area.swin(wr)
  
  ## Not run: circle with radius 50 centred on (55,45)
  wc<-swin(c(55,45,50))
  area.swin(wc)
  
 ## Not run: polygon (diamond shape)
 t1 <- c(0,0,55,0,0,45)
 t2 <- c(55,0,110,0,110,45)
 t3 <- c(0,45,0,90,55,90)
 t4 <- c(55,90,110,90,110,45)
 wp <- swin(wr, rbind(t1,t2,t3,t4))
 area.swin(wp)

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