Nothing
#---------------------------------------------------------------------------
#
# Returns the area of an object. Note that the "raster" package defines
# the generic and defining one here also will result in a warning from R,
# so I have just used their generic instead...
#
# 1. "InclusionZone" general, for most IZs
# 2. "standUpIZ" uses circularPlot
# 3. "chainSawIZ" is always a pain
# 4. "Tract" and subclasses
# 5. "InclusionZoneGrid"
#
# ...standingTree related...
# 1. "circularPlotIZ"
#
#Author... Date: 10-May-2011
# Jeffrey H. Gove
# USDA Forest Service
# Northern Research Station
# 271 Mast Road
# Durham, NH 03824
# jhgove@unh.edu
# phone: 603-868-7667 fax: 603-868-7604
#---------------------------------------------------------------------------
# generic definition...
#
#if(!isGeneric("area"))
# setGeneric('area', package='sampSurf',
# function(object, ...) standardGeneric('area'),
# signature = c('object')
# )
#^^^^raster has a generic area function already^^^
#================================================================================
# method for general "InclusionZone" objects...
#
setMethod('area',
signature(x = 'InclusionZone'),
function(x,
...
)
{
#------------------------------------------------------------------------------
# most of the newer inclusion zone objects just have an area slot...
#
return(x@area)
} #"InclusionZone" constructor
) #setMethod
#================================================================================
# method for "standUpIZ" objects...
#
setMethod('area',
signature(x = 'standUpIZ'),
function(x,
...
)
{
#------------------------------------------------------------------------------
# gotta get it from the circularPlot object...
#
return(x@circularPlot@area)
} #"standUpIZ" constructor
) #setMethod
#================================================================================
# method for "chainsawIZ" objects...
#
setMethod('area',
signature(x = 'chainSawIZ'),
function(x,
...
)
{
#------------------------------------------------------------------------------
# chainsaw is always wierd--the area is a point==0...
#
return(0)
} #"chainSawIZ" constructor
) #setMethod
#================================================================================
# method for "Tract" objects...
#
setMethod('area',
signature(x = 'Tract'),
function(x,
...
)
{
#------------------------------------------------------------------------------
# just get the area slot...
#
return(x@area)
} #"Tract" constructor
) #setMethod
#================================================================================
# method for "InclusionZoneGrid" objects...
#
setMethod('area',
signature(x = 'InclusionZoneGrid'),
function(x,
...
)
{
#------------------------------------------------------------------------------
# just determine the area from the extents...
#
area = nrow(x@grid)*ncol(x@grid)*xres(x@grid)^2
return(area)
} #"InclusionZoneGrid" constructor
) #setMethod
#================================================================================
# method for "circularPlotIZ" objects...
#
setMethod('area',
signature(x = 'circularPlotIZ'),
function(x,
...
)
{
#------------------------------------------------------------------------------
# gotta get it from the circularPlot object...
#
return(x@circularPlot@area)
} #"circularPlotIZ" constructor
) #setMethod
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