Description Usage Arguments Details Value Author(s) See Also Examples
Calculate the convex hull for a set of points.
1 | calcConvexHull (xydata, keepExtra=FALSE)
|
xydata |
a data frame with columns |
keepExtra |
logical: if |
This routine uses the function chull()
in the package grDevices.
By default, it ignores all columns other than X
and Y
;
however, the user can choose to retain additional columns in xydata
by specifying keepExtra=TRUE
.
PolySet with columns PID
, POS
, X
, Y
,
and additional columns in xydata
if keepExtra=TRUE
.
Nicholas M. Boers, Associate Professor – Computer Science
MacEwan University, Edmonton AB
Last modified Rd: 2013-04-10
addPoints
,
addPolys
,
calcArea
,
calcCentroid
,
calcMidRange
,
calcSummary
,
locateEvents
,
plotMap
,
plotPoints
,
plotPolys
.
1 2 3 4 5 6 7 8 | local(envir=.PBSmapEnv,expr={
oldpar = par(no.readonly=TRUE)
data(surveyData,envir=.PBSmapEnv)
#--- plot the convex hull, and then plot the points
plotMap(calcConvexHull(surveyData),col="moccasin")
addPoints(surveyData,col="blue",pch=17,cex=.6)
par(oldpar)
})
|
sh: 1: cannot create /dev/null: Permission denied
-----------------------------------------------------------
PBS Mapping 2.70.4 -- Copyright (C) 2003-2017 Fisheries and Oceans Canada
PBS Mapping comes with ABSOLUTELY NO WARRANTY;
for details see the file COPYING.
This is free software, and you are welcome to redistribute
it under certain conditions, as outlined in the above file.
A complete user guide 'PBSmapping-UG.pdf' is located at
/usr/lib/R/site-library/PBSmapping/doc/PBSmapping-UG.pdf
Packaged on 2017-06-28
Pacific Biological Station, Nanaimo
All available PBS packages can be found at
https://github.com/pbs-software
To see demos, type '.PBSfigs()'.
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