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\name{fires}
\alias{fires}
\title{Northern Los Angeles County Fires}
\usage{data(fires)}
\format{
A data frame with 313 observations with day of occurrence, x and
y coordinates.
}
\description{
Wildfire occurrences in Northern Los Angeles County, California
between 1976 and 2000. The spatial units are in scaled feet, taken
from the NAD 83 state-plane coordinate system. One unit is equivalent
to 100,000 feet or 18.9 miles. The times for the points were produced
by the \code{date} package and represent the number of days since
January 1, 1960.
}
\author{ Roger Peng, taken from (non-CRAN) package ptproc,
\url{https://www.biostat.jhsph.edu/~rpeng/software/index.html};
example code by Roger Bivand.
}
\examples{
data(fires)
fires$X <- fires$X*100000
fires$Y <- fires$Y*100000
library(sp)
coordinates(fires) <- c("X", "Y")
proj4string(fires) <- CRS("+init=epsg:2229 +ellps=GRS80")
dates <- as.Date("1960-01-01")+(fires$Time-1)
Fires <- STIDF(as(fires, "SpatialPoints"), dates, data.frame(time=fires$Time))
if (require(rgdal)) {
library(maptools)
library(mapdata)
m <- map("county", "california", xlim=c(-119.1, -117.5),
ylim=c(33.7, 35.0), plot=FALSE)
cc <- spTransform(map2SpatialLines(m,
proj4string=CRS("+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84")),
CRS("+init=epsg:2229 +ellps=GRS80"))
plot(cc, xlim=c(6300000, 6670000), ylim=c(1740000, 2120000))
plot(slot(Fires, "sp"), pch=3, add=TRUE)
stplot(Fires, sp.layout=list("sp.lines", cc))
}
}
\keyword{datasets}
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