Following up my last post in which I praised the capabilities of the osmar-package I give a short example…

ps: You can also find this example at GitHub HERE.

library(osmar)

# this pulls the data from the OSM-Api:

mydistrict <- get_osm(relation(85647), full = TRUE)

# make a spatial object:

mydistrict_sp <- as_sp(mydistrict, what = 'lines')

summary(mydistrict_sp)

# just for fun i'll plot some bubbles on my map:

mydata <- data.frame(x = runif(100, 12.300, 12.550),

y = runif(100, 47.300, 47.550),

data = sample(1:30, 100, replace = T))

mydata_sp <- SpatialPointsDataFrame(mydata[, c('x', 'y')], data=mydata,

proj4string=CRS('+proj=longlat +datum=WGS84'))

# see what's in there:

summary(mydata_sp)

# plot:

setwd(tempdir())

pdf("testOSM.pdf")

par(oma = rep(0, 4))

mycex = (mydata_sp@data[,'data']/max(mydata_sp@data[,'data'])*2)^2

plot(mydistrict_sp, axes = T)

colpts = rgb(0.2, 0.5, 0.4, alpha = 0.6)

points(x = mydata_sp@coords[,'x'],

y = mydata_sp@coords[,'y'],

cex = mycex, col = 0,

pch = 21, bg = colpts)

title('MyData in MyDistrict')

# legend:

l1 = min(mydata_sp@data[,'data'])

l2 = round(mean(mydata_sp@data[,'data']), 0)

l3 = max(mydata_sp@data[,'data'])

l = c(l1, l2, l3)

lcex = (c(l/l3*2))^2

points(x = rep(12, 3), y = seq(47.7, 47.6, -.05),

cex = lcex, col = 0,

pch = 21, bg = colpts)

text(l, x = rep(12, 3) +.045, y = seq(47.7, 47.6, -.05))

graphics.off()

# open map:

shell.exec("testOSM.pdf")

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**Tags:** maps, OpenStreetMaps, osmar, R