R: Northern Los Angeles County Fires

fires {spacetime} | R Documentation

## 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,

http://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))
    }

[Package spacetime version 1.2-2 Index]