www.nr.no

RgoogleMapsNorsk statistikermøte, Halden, 11. juni 2013

André TeiglandForskningssjefSAMBA

www.nr.no

Elisabeth OrskaugThordis Thorarinsdottir

Norsk Regnesentral

RgoogleMaps

˃ Provide a comfortable R interface to query the Google server for static maps

> Use the map as background image to overlay plots within R.

5. RgoogleMaps

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Plot world map from google maps

˃ library(RgoogleMaps)

> MyMap = GetMap(center=c(0,0), zoom =1, destfile = "World1.png ")

Section 5.1

320

5. RgoogleMaps

Change the center

You can change the center (lat, lon):

˃ MyMap = GetMap(center=c(59.95,10.7), zoom =1, destfile = "World2.png")

Section 5.2

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5. RgoogleMaps

Change the zoom variable

You can zoom the map by changing "zoom":Section 5.3

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MyMap = GetMap(center = c(59.95,10.7), zoom =10, destfile = "World3.png")

MyMap = GetMap(center = c(59.95,10.7), zoom =13, destfile = "World4.png")

5. RgoogleMaps

Change the size

You can change the size (pixels). (The default and maximum size is 640x640 pixels):Section 5.4

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MyMap = GetMap(center=c(59.95,10.7), zoom =10, destfile = "World3Size200.png", size=c(200,200))

MyMap = GetMap(center=c(59.95,10.7), zoom =10, destfile = "World3Size500.png", size=c(500,500))

5. RgoogleMaps

Choose the right maptype

There are different maptypes to choose from:

Section 5.5

maptype = "satellite"

maptype = "roadmap" maptype = "terrain" maptype = "hybrid"

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5. RgoogleMaps

Make a plot in grayscale

You can make a plot in greyscale by adding GRAYSCALE=TRUE:

˃ GetMap(center=c(59.95,10.7), zoom =10, destfile = "OsloTerrainGRAYSCALE.png", maptype = "terrain", GRAYSCALE=TRUE)

Section 5.6

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5. RgoogleMaps

Make a map including several points

#The function qbbox() basically computes a bounding box for the given lat, lon points (with a few additional options -> see ?qbbox)

#We want to include the points (lat, lon) = (59.95, 10.7), (59.7, 10.3) and (59.3, 11.4).

> bb = qbbox(c(59.95, 59.7, 59.3, 62),c(10.7,10.3, 11.4,11.4))

˃ print(bb)

#$latR

#[1] 59.2865 62.0135

#$lonR

#[1] 10.2945 11.4055

> MyMap = GetMap.bbox(bb$lonR, bb$latR,destfile = "OsloBig.png", maptype = "roadmap")

Section 5.7

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5. RgoogleMaps

Assignment

˃ Make a map that includes both Oslo (lat, lon) = (59.95, 10.7) and Kristiansand (lat, lon) = (58.13, 8.02).

Section 5.8

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5. RgoogleMaps

Suggestion

> bb = qbbox(c(59.95, 58.13),c(10.7,8.02))

˃ MyMap = GetMap.bbox(bb$lonR, bb$latR,destfile = "OsloKristiansand.png", maptype = "roadmap")

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5. RgoogleMaps

Adding points and lines

#Make plot on map:

> bb = qbbox(c(59.95, 58.13),c(10.7,8.02))

˃ MyMap = GetMap.bbox(bb$lonR, bb$latR,destfile = "OsloKristiansand.png", maptype = "roadmap")

#Define the markers:

> mymarkers = cbind.data.frame(lat = c(59.95, 58.13), lon = c(10.7,8.02))

#plot

˃ png("OsloKristiansandLine.png",640,640)

#adding points

> tmp = PlotOnStaticMap(MyMap,lat = mymarkers[,"lat"], lon = mymarkers[,"lon"], cex=2.5,pch=20,col=c("cyan", "brown1"), add=F)

#adding line

> tmp = PlotOnStaticMap(MyMap,lat = mymarkers[,"lat"], lon = mymarkers[,"lon"], col=c("blueviolet"), add=T, FUN = lines, lwd = 4)

> dev.off()

Section 5.9

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5. RgoogleMaps

Example of plotting points

> png("cosomapPoints.png")

> data(cosomap)

> bb = qbbox(lon=cosomap$POINTS$lon-360,lat=cosomap$POINTS$lat)

> MyMap = GetMap.bbox(bb$lonR, bb$latR,destfile = "Coso.png", maptype= "satellite",zoom=11)

> tmp = PlotOnStaticMap(MyMap,lon=cosomap$POINTS$lon-360,lat=cosomap$POINTS$lat, pch=20,cex = .5,col= "red", verbose=0)

> dev.off()

Section 5.10

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5. RgoogleMaps

Add a square in a map

Plot one square in a map over Norway.

˃ MyMap = GetMap.bbox(c(4.51,31.26), c(57.91,71.24), destfile= "Norway.png" , GRAYSCALE=T, size=c(410,410), zoom=4)

˃ pdf("MapNorwayOneSquare.pdf")

˃ indNor = 600 #choose one grid out of 777.

˃ polys = data.frame(PID=rep(1,4),SID=rep(1,4),POS=1:4, X=c(coord.lon[indNor,1],coord.lon[indNor,4],coord.lon[indNor,3],coord.lon[indNor,2]), Y = c(coord.lat[indNor,1], coord.lat[indNor,4], coord.lat[indNor,3], coord.lat[indNor,2]))

˃ color1 = rainbow(20,alpha=0.8) #transparent color; the map is shown under the square.

˃ nr.color = 17

˃ PlotPolysOnStaticMap(MyMap, polys, lwd=.5, col=color1[nr.color], add = F)

˃ graphics.off()

Section 5.11

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5. RgoogleMaps

Add border of counties

Map over Norway adding border of counties.

> PlotPolysOnStaticMap(MyMap, shp[ind[1]:ind2[1],], col=0, lwd=.5, add = F,verbose=.5)

> for(i in 2:length(ind)){

> PlotPolysOnStaticMap(MyMap, shp[ind[i]:ind2[i],], col=0, lwd=.5, add = T,verbose=.5)

> }

Section 5.12

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5. RgoogleMaps

Add squares and border of countiesPlot squares that covers Norway and add border of counties.

˃ PlotPolysOnStaticMap(MyMap, shp[ind[1]:ind2[1],], col=0, lwd=.5, add = F,verbose=.5)

˃ for(i in 2:length(ind)){

˃ PlotPolysOnStaticMap(MyMap, shp[ind[i]:ind2[i],], col=0, lwd=.5, add = T,verbose=.5)

˃ }

˃ for(indNor in 1:nrow(index.norway)){

˃ polys=data.frame(PID=rep(1,4),SID=rep(1,4),POS=1:4, X=c(coord.lon[indNor,1],coord.lon[indNor,4],coord.lon[indNor,3],coord.lon[indNor,2]), Y = c(coord.lat[indNor,1],coord.lat[indNor,4],coord.lat[indNor,3],coord.lat[indNor,2]))

˃ color1 = rainbow(20,alpha=0.2)

˃ nr.color = 10

˃ PlotPolysOnStaticMap(MyMap, polys, lwd=.5, col=color1[nr.color], add = T)

˃ }

Section 5.13

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5. RgoogleMaps

Add squares and border of counties

maptype = hybridSection 5.14

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5. RgoogleMaps

Assignment

> Add grids covering only Finnmark (the county longest North) on the map "Norway.png".

Section 5.15

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5. RgoogleMaps

Suggestion

˃ pdf("MapFinnmark.pdf")

˃ …

˃ for(indNor in c(633,639:nrow(index.norway))){

˃ …

˃ }

˃ graphics.off()

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5. RgoogleMaps

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André TeiglandForskningssjefSAMBA

www.nr.no

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