projection | R Documentation |
Functions to manipulate the coordinate reference system (CRS) of ctmm objects
## S4 method for signature 'telemetry'
projection(x,asText=TRUE)
## S4 method for signature 'ctmm'
projection(x,asText=TRUE)
## S4 method for signature 'UD'
projection(x,asText=TRUE)
## S4 method for signature 'list'
projection(x,asText=TRUE)
## S4 method for signature 'NULL'
projection(x,asText=TRUE)
## S4 replacement method for signature 'telemetry'
projection(x) <- value
## S4 replacement method for signature 'list'
projection(x) <- value
## S3 method for class 'telemetry'
median(x,na.rm=FALSE,...)
compass(loc=NULL,cex=3,...)
x |
A |
asText |
If |
value |
Projection to apply. Can also be a data.frame of longitude-latitude foci. |
na.rm |
Not used. |
... |
Arguments passed to |
loc |
Optional two-dimensional coordinates (in meters) at which to draw a north-facing compass needle. |
cex |
Relative size of compass. |
projection(x)
returns the projection information from ctmm object x
, while projection(x) <- value
applies the projection value
to object x
.
median(x)
returns the ellipsoidal geometric median of a telemetry object.
compass(c(x,y))
plots a north-pointing compass needle at the coordinates (x,y)
.
Plotting UTF-8 chracters in a PDF, like the compass needle, requires specifying a compatible font family. For example:
library(ctmm)
data(buffalo)
cairo_pdf(file="buffalo.pdf",family="DejaVu Sans")
plot(buffalo[[1]])
compass()
dev.off()
C. H. Fleming
as.telemetry
.
# Load package and data
library(ctmm)
data(buffalo)
# Apply a 1-point projection that preserves North==up
projection(buffalo) <- median(buffalo)
plot(buffalo)
compass()
# Apply a 2-point projection safer for elongated disributions
projection(buffalo) <- median(buffalo,k=2)
# This is the default projection for ctmm
plot(buffalo)
compass()
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