1. www.nr.no RgoogleMaps Norsk statistikermøte, Halden, 11. juni 2013 André Teigland Forskningssjef SAMBA www.nr.no Elisabeth Orskaug Thordis Thorarinsdottir Norsk Regnesentral

2. 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 2/20

3. 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

4. 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 4/20 5. RgoogleMaps

5. Change the zoom variable You can zoom the map by changing "zoom": Section 5.3 5/20 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

6. Change the size You can change the size (pixels). (The default and maximum size is 640x640 pixels): Section 5.4 6/20 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

7. Choose the right maptype There are different maptypes to choose from: Section 5.5 maptype = "satellite"maptype = "roadmap"maptype = "terrain"maptype = "hybrid" 7/20 5. RgoogleMaps

8. 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 8/20 5. RgoogleMaps

9. 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 9/20 5. RgoogleMaps

10. 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 10/20 5. RgoogleMaps

11. 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") 11/20 5. RgoogleMaps

12. 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 12/20 5. RgoogleMaps

13. 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 13/20 5. RgoogleMaps

14. 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[indN or,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 14/20 5. RgoogleMaps

15. 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 15/20 5. RgoogleMaps

16. Add squares and border of counties Plot 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[i ndNor,2])) ˃ color1 = rainbow(20,alpha=0.2) ˃ nr.color = 10 ˃ PlotPolysOnStaticMap(MyMap, polys, lwd=.5, col=color1[nr.color], add = T) ˃ } Section 5.13 16/20 5. RgoogleMaps

17. Add squares and border of counties maptype = hybrid Section 5.14 17/20 5. RgoogleMaps

18. Assignment > Add grids covering only Finnmark (the county longest North) on the map "Norway.png". Section 5.15 18/20 5. RgoogleMaps

19. Suggestion ˃ pdf("MapFinnmark.pdf") ˃ … ˃ for(indNor in c(633,639:nrow(index.norway))){ ˃ … ˃ } ˃ graphics.off() 19/20 5. RgoogleMaps

20. www.nr.no André Teigland Forskningssjef SAMBA www.nr.no Short break