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\name{cruz}
\alias{cruz}
\docType{data}
\title{
Landscape data for Santa Cruz Island
}
\description{
Spatially-referenced elevation, forest cover, and vegetation data for
Santa Cruz Island.
}
\usage{data(cruz)}
\format{
A data frame with 2787 observations on the following 5 variables.
\describe{
\item{\code{x}}{Easting (meters)}
\item{\code{y}}{Northing (meters)}
\item{\code{elevation}}{a numeric vector, FEET (multiply by 0.3048 to convert to meters) }
\item{\code{forest}}{a numeric vector, proportion cover}
\item{\code{chaparral}}{a numeric vector, proportion cover}
}
}
\details{
The resolution is 300x300 meters.
The Coordinate system is EPSG number 26911
NAD_1983_UTM_Zone_11N
Projection: Transverse_Mercator
False_Easting: 500000.000000
False_Northing: 0.000000
Central_Meridian: -117.000000
Scale_Factor: 0.999600
Latitude_Of_Origin: 0.000000
Linear Unit: Meter
GCS_North_American_1983
Datum: D_North_American_1983
}
\source{
Brian Cohen of the Nature Conservancy helped prepare the data
}
\references{
Sillett, S. and Chandler, R.B. and Royle, J.A. and Kery, M. and
Morrison, S.A. In Press. Hierarchical distance sampling models to
estimate population size and habitat-specific abundance of an island
endemic. \emph{Ecological Applications}
}
\examples{
\dontrun{
library(lattice)
data(cruz)
str(cruz)
levelplot(elevation ~ x + y, cruz, aspect="iso",
col.regions=terrain.colors(100))
if(require(raster)) {
elev <- rasterFromXYZ(cruz[,1:3],
crs="+proj=utm +zone=11 +ellps=GRS80 +datum=NAD83 +units=m +no_defs")
elev
plot(elev)
}
}
}
\keyword{datasets}
|
