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I'm a university student, and r programming beginner. I have a problem when study 'ggplot2' package.

I want plot 'wifi zone' and add circles to a plot, but i cannot do.. and puzzled about what to do..

and I want to know point_geom size that correspond to "wifi zone" real radius '20 meters'.

Data contains latitude, longitude of spot and about what kind of mobile agency is servicing.

My codes as follows : 

library(ggmap)

wifi_daejeon <- read.csv("C:/Users/Byeongsoo/Desktop/R markdown/대전와이파이.csv")
wifi_gungdong <- subset(wifi_daejeon, EMD_NM == "궁동")
cent_gungdong <- c(mean(wifi_gungdong$LON), mean(wifi_gungdong$LAT))
bmap_gungdong <- ggmap(get_googlemap(center = cent_gungdong, zoom = 15, maptype = "roadmap"), 
                       extent = "device", 
                       base_layer = ggplot(wifi_gungdong, aes(x = LON, y = LAT, colour = CCB)))
bmap_gungdong + 
  geom_point() + 
  theme(plot.title = element_text(size = 20, colour = "BLUE"), 
  axis.text = (element_text(size=10))) +  
  theme(legend.title = element_text(size = 15)) +
  theme()

unfortunately, i can't upload image, because i don't have 10 reputation..

image's URL is :

http://postfiles4.naver.net/20140318_99/soccerball1_1395130002602k7k10_PNG/%C4%B8%C3%B3.PNG?type=w3

This has been my Question. Thank you for reading up to now.

tonytonov
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StatisticBang
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  • Appears to be a duplicate of: http://stackoverflow.com/questions/20736330/concentric-circles-like-a-grid-centered-at-origin – IRTFM Mar 18 '14 at 08:24
  • Similar is here - http://stackoverflow.com/questions/6862742/draw-a-circle-with-ggplot2 – Maciej Mar 18 '14 at 08:29

1 Answers1

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map <- get_map()
g<-ggmap(map, extent = TRUE)
g + geom_point(aes(x=-95.36327,y=29.763284),col='red',size=20,shape=1)
Maciej
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  • oh.. this is what i want! I appreciate your help! – StatisticBang Mar 18 '14 at 08:36
  • No problem, if it is what you want please mark it as an correct anwser. – Maciej Mar 18 '14 at 11:01
  • oh . i see. once again, i am grateful to you to your help – StatisticBang Mar 19 '14 at 00:04
  • I believe size=20 in this case will not actually show size in meters, but just a scaled size. I am still looking for an answer, closest thing I could find is: http://gis.stackexchange.com/questions/119736/ggmap-create-circle-symbol-where-radius-represents-distance-miles-or-km – Tilek Sep 18 '15 at 23:04