[R-sig-Geo] overlay 1D graph on a map or map image: van Langren data

[Michael Friendly]

hadley wickham wrote:
>
> Here's a quick start using ggplot2 - one trick to make the map look
> nicer is to use a bigger range when calling map, and then adjust the
> limits of the plot to zoom in on the region of interest.
>
> library(maps)
> library(ggplot2)
>
> langren <- read.csv("http://euclid.psych.yorku.ca/SCS/Gallery/Private/langrens.csv",
> header=TRUE)
>
> bbox <- c( 38.186, -9.184,
>          43.692, 28.674 )
> bbox <- matrix(bbox, 2, 2, byrow=TRUE)
>
> borders <- as.data.frame(map("world", plot = F,
>   xlim = expand_range(bbox[,2], 0.2),
>   ylim = expand_range(bbox[,1], 0.2))[c("x", "y")])
>
> data(world.cities)
> cities <- subset(world.cities,
>   name %in% c("Rome", "Toledo") & country.etc %in% c("Spain", "Italy"))
>
> ggplot(langren, aes(long, lat)) +
>   geom_path(aes(x, y), borders, colour = "grey60") +
>   geom_point(y = 40) +
>   geom_text(aes(label = name), y = 40.1, angle = 90, hjust = 0, size = 3) +
>   geom_point(data = cities, colour = "red", size = 2) +
>   coord_cartesian(xlim=bbox[,2], ylim=bbox[,1])
>
>   
Thanks very much, Hadley.  However, it doesn't work for me, using 
ggplot2_0.7, even when adding

langren$lat <- 39.68


 > ggplot(langren, aes(long, lat)) +
+   geom_path(aes(x, y), borders, colour = "grey60") +
+   geom_point(y = 40) +
+   geom_text(aes(label = name), y = 40.1, angle = 90, hjust = 0, size = 
3) +
+   geom_point(data = cities, colour = "red", size = 2) +
+   coord_cartesian(xlim=bbox[,2], ylim=bbox[,1])
Error in get("new", env = CoordCartesian, inherits = 
TRUE)(CoordCartesian,  :
  unused argument(s) (xlim = c(-9.184, 28.674), ylim = c(38.186, 43.692))

Eliminating the last line (coord_caertesian) gives a different error,  
and just the first gives

 > ggplot(langren, aes(long, lat))
Error: No layers in plot


 > sessionInfo()
R version 2.8.0 (2008-10-20)
i386-pc-mingw32

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United 
States.1252;LC_MONETARY=English_United 
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] splines   grid      stats     graphics  grDevices utils     
datasets  methods 
[9] base    

other attached packages:
[1] ggplot2_0.7        MASS_7.2-44        RColorBrewer_1.0-2 
proto_0.3-8      
[5] reshape_0.8.2      plyr_0.1.3         rimage_0.5-7       
foreign_0.8-29   
[9] maps_2.0-40      
 ...



-- 
Michael Friendly     Email: friendly AT yorku DOT ca 
Professor, Psychology Dept.
York University      Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street    http://www.math.yorku.ca/SCS/friendly.html
Toronto, ONT  M3J 1P3 CANADA