R: USCA312/USCA50 - 312/50 cities in the US and Canada

USCA {TSP} | R Documentation

## USCA312/USCA50 – 312/50 cities in the US and Canada

### Description

The `USCA312` dataset contains the distances between 312 cities in the US and Canada as an object of class `TSP`. `USCA50` is a subset of `USCA312` containing only the first 50 cities.

### Format

`USCA312` and `USCA50` are objects of class `TSP`. `USCA312_GPS` is a data.frame with city name, long and lat.

### Details

The `USCA312_GPS` dataset contains the location (long/lat) of the 312 cities.

### Note

We want to thank Roger Bivand for his help with plotting the map.

### Author(s)

Michael Hahsler

### Source

John Burkardt, CITIES – City Distance Datasets, Florida State University, Department of Scientific Computing

### Examples

    data("USCA312")

    ## calculate a tour
    tour <- solve_TSP(USCA312)
    tour

    data("USCA312_GPS")
    head(USCA312_GPS)

    # The following examples requite the suggested package sp, maps, and maptools.
    # We run the example only if the packages are installed.

    if(require(sp) &&
        require(maps) &&
        require(maptools)) {

      library("sp")
      library("maps")
      library("maptools")

      data("USCA312_GPS")

      # create spatial coordinates and a basemap using WGS84 projection.
      USCA312_coords <- SpatialPointsDataFrame(cbind(USCA312_GPS$long, USCA312_GPS$lat),
          proj4string=CRS("+proj=longlat +datum=WGS84"), data = USCA312_GPS)
      USCA312_basemap <- map2SpatialLines(map("world",
              xlim=c(-166,-47), ylim=c(15,83),
              plot=FALSE), proj4string=CRS("+proj=longlat +datum=WGS84"))

      ## plot map
      plot(as(USCA312_coords, "Spatial"), axes=TRUE)
      plot(USCA312_basemap, add=TRUE, col = "gray")

      ## plot tour and add cities
      tour_line <- SpatialLines(list(Lines(list(
      Line(USCA312_coords[c(tour, tour[1]),])), ID="1")))

      plot(tour_line, add=TRUE, col = "red")
      points(USCA312_coords, pch=3, cex=0.4, col="black")
    }

[Package TSP version 1.2-0 Index]