fires: Northern Los Angeles County Fires

In spacetime: Classes and Methods for Spatio-Temporal Data

Northern Los Angeles County Fires

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 date package and represent the number of days since January 1, 1960.

Usage

data(fires)

Format

A data frame with 313 observations with day of occurrence, x and y coordinates.

Author(s)

Roger Peng, taken from (non-CRAN) package ptproc,

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))
library(mapdata)
if (require(sf)) {
 m <- map("county", "california", xlim=c(-119.1, -117.5), 
 	ylim=c(33.7, 35.0), plot=FALSE, fill=TRUE)
 m.sf <- st_transform(st_as_sfc(m), "EPSG:2229")
 cc <- as(m.sf, "Spatial")
 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))
}

spacetime documentation built on April 6, 2023, 1:09 a.m.