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.

The USCA312_map dataset contains spatial data of the 312 cities.

Usage

data("USCA312")
data("USCA312_map")
data("USCA50")

Format

USCA312 and USCA50 are objects of class TSP. USCA312_map contains in USCA312_coords the spatial coordinates of the 312 cities and in USCA312_basemap a part of the map of North America.

Details

For USCA312_map several packages for geographic data are needed (see Examples section).

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")
data("USCA312_map")

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

## load map tools
library("maps")
library("sp")
library("maptools")

## 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")

Results