Description Objects from the Class Slots Extends Methods Author(s) References See Also Examples
A subclass of virtual class “Stem
” that can be used to
represent downed coarse woody debris in the form of something
resembling a log. The class provides for creation and graphical
display of “downLog” objects.
Detail examples and information concerning this class is found in “The Stem Class” vignette, which should be consulted for more details on creating and using objects from this class.
Objects can be created by calls of the form new("downLog", ...)
.
However, this is not recommended. The object has a number of
required slots that can be somewhat complex to calculate. Therefore, a
constructor function downLog
has been provided that will
make the desired object with the correct values for the slots. It is
strongly recommended that one use this generic's methods to create the
log objects.
Please note that all diameters below are presumed to be in the
same units as length, i.e., meters for “metric”, and
feet for “English” units
.
In addition to the slots provided by the virtual superclass
“Stem
”, the following slots are
represented...
buttDiam
:Object of class "numeric"
: the log
diameter at the large (butt) end in the proper units.
topDiam
:Object of class "numeric"
: The
small-end diameter of the log.
logLen
:Object of class "numeric"
: The log
length in meters or feet.
logAngle
:Object of class "numeric"
: An angle
for the log's position established from the center of the log
relative to its "needle." The center of the log is equidistant
from both ends along the established needle. On a straight log,
the needle would correspond to the pith if everything were
perfect.
solidType
:Object of class
"numericNULL"
: The form parameter in the
simple taper and volume equation presented in Van Deusen (1990)
and Gove and Van Deusen (2011).
logVol
:Object of class "numeric"
: The log's
volume.
surfaceArea
:Object of class "numeric"
: Total
log surface area in the appropriate units.
coverageArea
:Object of class "numeric"
: Total
log coverage area in the appropriate units.
biomass
:Object of class "numeric"
: Total log
biomass. This will be NA
if no conversion was specified at
object creation.
carbon
:Object of class "numeric"
: Total log
carbon content. This will be NA
if no conversion was
specified at object creation.
conversions
:Object of class "numeric"
: A
vector with names c('volumeToWeight','weightToCarbon')
specifying the conversion factors for woody biomass and carbon
content.
taper
:Object of class "data.frame"
: The log's
taper, either as specified from measurements, or as generated via
downLog
.
profile
:Object of class "data.frame"
: The log
profile as generated from the taper. The log is assumed to be
oriented with the small-end North, and the base at the origin.
rotLog
:Object of class "matrix"
: A rotated and
translated version of profile
using logAngle
and
location
fields.
spLog
:Object of class "SpatialPolygons"
: A
SpatialPolygons
representation of rotLog
via the
sp
package.
slNeedleAxis
:Object of class "SpatialLines"
: A
fully transformed (rotated and translated) representation of the
needle for the log as a SpatialLines
object
from package sp
.
Class "Stem"
, directly.
signature(obj = "downLog")
: Returns the bounding
box for the object.
signature(downLog = "downLog", plotRadius =
"numeric")
: Chainsaw method inclusion zone constructor.
signature(x = "downLog", y = "missing")
:
Graphically display a "downLog" object.
signature(downLog = "downLog", plotRadius =
"numeric")
: Sausage sampling inclusion zone constructor.
signature(downLog = "downLog", plotRadius =
"numeric")
: Stand-up method inclusion zone constructor.
signature(object = "downLog")
: Summary of the
object.
Jeffrey H. Gove
Gove, J. H., Williams, M. S., Stahl, G. and Ducey, M. J. 2005. Critical
point relascope sampling for unbiased volume estimation of downed coarse
woody debris. Forestry 78:417–431.
Gove, J. H. and Van Deusen, P. C. 2011. On fixed-area plot sampling for
downed coarse woody debris. Forestry Forestry 84:109–117.
Van Deusen, P.C. 1990. Critical height versus importance sampling for
log volume: does critical height prevail? Forest Science
36(4):930–938.
"Stem
", "standingTree
",
"StemContainer
"
1 | showClass("downLog")
|
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