在下从雪晴数据网教程，模拟了一下
REmap(demoC)
http://www.xueqing.cc/course/34
然后模拟了一下几个城市的地球径向线图，但是结果一片空白... REmap程序包只支援中国大陆而已（
get_geo_position(c("Taipei","Taiwan"))也无法侦测到地点）
http://www.r-bloggers.com/r-beginners-plotting-locations-on-to-a-world-map/
> visited <- c("SFO", "Chennai", "London", "Melbourne", "Johannesbury, SA")
> ll.visited <- geocode(visited)
> visit.x <- ll.visited$lon
> visit.y <- ll.visited$lat
> data.frame(visit.x,visit.y,visited)
visit.x visit.y visited
1 -122.4194200 37.77493 SFO
2 80.2784700 13.08784 Chennai
3 -0.1278328 51.50726 London
4 144.9633200 -37.81400 Melbourne
5 45.0000000 25.00000 Johannesbury, SA
> data.frame(visit.x,visit.y,visited) %>% remap
Save img as: /tmp/RtmphAsjZ3/ID_20151102105417_536872.2.html
Warning message:
In get_geo_position(city_vec) :
-122.41942 not found.80.27847 not found.-0.1278328 not found.144.96332 not found.37.77493 not found.13.08784 not found.51.5072648 not found.-37.814 not found.25 not found.
