There is currently only one method based on the
circularPlot
generic that is used for object
construction. It is detailed below.
signature(radius = "numeric")
This method takes the plot radius as the signature argument along with other optional aruments described as follows...
usage...
circularPlot(radius, units = 'metric', spUnits = CRS(projargs=as.character(NA)), centerPoint = c(x=0, y=0), description = 'fixed area circular plot', nptsPerimeter = 100, spID = unlist(strsplit(tempfile('cp:',''),'\/'))[2], ...)
radius
: The fixed-plot
radius in the correct units. For "English" units, this would be
feet, for "metric" units, meters.
units
: Either “English” or “metric”. These
must be conformable with the projection in spUnits
.
spUnits
: A valid CRS
object
specifying the Coordinate Reference System. This defaults to
NA
, which means you want to use your own user-defined
system, say for a sample plot located in the field.
centerPoint
: The location of the center of the
fixed-area plot in the appropriate spatial units. This should be
a numeric vector of length 2 with names "x" and "y".
description
: A character vector description of the
tract.
nptsPerimeter
: The number of points that will
compose the spatial perimeter of the object. Note that the final
result will always be one more point than requested in order to
close the polygon.
spID
: Each object should have its own unique
identifier that is used in constructing the Polygons
object for the perimeter. This becomes very important when combining
individual plots into a population. If nothing is supplied, a
random ID is generated.
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