Mapping Hans Island

This document will be incomplete if rgdal is unavailable or there is on internet connection when this document is compiled. The full document is at diseasemapping.r-forge.r-project.org.

coords = rbind(Alert = c(-62.338889, 82.501389),
  Qaanaaq = c(-69.238685,77.466335),    
  'Alex Fjord' = c(-75.999722, 78.9),
  'Hans island' = c(-66.459722, 80.828056)
)

x = SpatialPointsDataFrame(
  coords, 
  data=data.frame(name=rownames(coords)),
  proj4string=crsLL
)

if(haveRgdal){
  map = openmap(x, path='osm-no-labels', maxTiles=12, buffer=c(30,3))

  map.new(map)
  plot(map,add=TRUE)
  points(x)
  text(x, label=x$name, pos=4)
  scaleBar(x, 'bottom')
  scaleBar(x, 'left', seg.len=0, bty='n')
}

if(haveRgdal){
  mapSat = openmap(x, path='opentopomap', maxTiles=4, buffer=c(30,3))

  map.new(mapSat)
  plot(mapSat,add=TRUE)
  points(x)
  text(x, label=x$name, pos=4)
  scaleBar(x, 'bottom')
  scaleBar(x, 'left', seg.len=0, bty='n')
}

if(haveRgdal){
  mapSat = openmap(x=x[x$name=='Hans island',], 
    path='opentopomap', 
    buffer=c(4,1), zoom=2)

  map.new(x[x$name=='Hans island',], buffer=0.3)
  plot(mapSat,add=TRUE)
  points(x, pch=4, col='#FF000040', cex=5)
  text(x, label=x$name, pos=4)
  scaleBar(x, 'bottomright')
}

if(haveRgdal){
  xMerc = spTransform(x, omerc(x))
  mapMerc = openmap(xMerc, path='osm-no-labels',
    zoom=3,
    maxTiles=12, buffer=c(50,200)*1000)

  map.new(xMerc, buffer=50000)
  plot(mapMerc,add=TRUE)
  points(xMerc)
  text(xMerc, label=xMerc$name, pos=4)
  scaleBar(xMerc, 'bottomleft')
  scaleBar(xMerc, 'left', seg.len=0, bty='n')
}

if(haveRgdal){
  xOmerc = spTransform(x, 
    omerc(x,angle=5))

  map = openmap(xOmerc, 
    path=c('osm-no-labels', 'stamen-terrain-labels'), 
    fact=1.5, maxTiles=12, 
    buffer=c(2,10,10,0)*100*1000)

  mapText = rgbtToIndex(map, pattern='stamen.terrain.labels')

  map.new(map)
  plot(map[['osm.no.labels']], add=TRUE)
  gridlinesWrap(crs=map, easts=seq(-180,0,by=2), col='red')
  plot(mapText,add=TRUE)
  points(xOmerc)
  text(xOmerc, label=xOmerc$name, pos=4)
  scaleBar(xOmerc, 'bottom', bg='white')
  scaleBar(xOmerc, 'left', seg.len=0, bty='n')
}

if(haveRgdal){
  map = openmap(x[x$name=='Alex Fjord',],       
    path='maptoolkit', zoom=3, 
    buffer=c(5,5,2,1))   
  map.new(map)
  plot(map, add=TRUE)
  points(x, pch=4, col='red', cex=5)
  text(x, label=x$name, pos=1, col='red')
  scaleBar(x, 'bottomleft')
}

Mapping Antipodes Island

Check to see that Mount Waterhouse and a rocky island are correctly positioned

waterhouseLL = SpatialPoints(
  cbind(x=178.7729285, y=-49.6941201), 
  proj4string=crsLL
)

rockLL = SpatialPoints(
  cbind(x=178.80112, y=-49.69171), 
  proj4string=crsLL
)


if(haveRgdal) {
  waterhouseMerc <- spTransform(waterhouseLL, crsMerc)


  rockMerc = spTransform(rockLL, crsMerc)

#dput(rockMerc, file='')
#dput(waterhouseMerc, file='')

} else {

  waterhouseMerc = new("SpatialPoints"
    , coords = structure(c(19900911.3682423, -6393470.38497316), .Dim = 1:2, .Dimnames = list(
        NULL, c("x", "y")))
    , bbox = structure(c(19900911.3682423, -6393470.38497316, 19900911.3682423, 
        -6393470.38497316), .Dim = c(2L, 2L), .Dimnames = list(c("x", 
          "y"), c("min", "max")))
    , proj4string = new("CRS"
      , projargs = "+proj=merc +ellps=sphere +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +no_defs"
    )
  )

  rockMerc = new("SpatialPoints"
    , coords = structure(c(19904049.631667, -6393055.64126258), .Dim = 1:2, .Dimnames = list(
        NULL, c("x", "y")))
    , bbox = structure(c(19904049.631667, -6393055.64126258, 19904049.631667, 
        -6393055.64126258), .Dim = c(2L, 2L), .Dimnames = list(c("x", 
          "y"), c("min", "max")))
    , proj4string = new("CRS"
      , projargs = "+proj=merc +ellps=sphere +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +no_defs"
    )
  )
}

if(haveRgdal){

  waterhouseWrap = spTransform(
    waterhouseMerc, moll(waterhouseMerc, angle=25)
  )


  southInset = openmap(x=waterhouseWrap, 
    path='osm-no-labels',
    buffer=c(4,1,2,1)*1000*1000)

} else {
  southInset = openmap(waterhouseMerc, 
    path='osm-no-labels',
    buffer=c(4,0,0,1.5)*1000*1000, 
    crs=NA)
}

Red circle has radius 1km.

mapMerc = openmap(waterhouseMerc, buffer=4000, crs=NA)

map.new(mapMerc)
plot(mapMerc, add=TRUE)
points(waterhouseMerc, col='blue', cex=5)
insetMap(crs=mapMerc, 
  pos='bottomright', 
  map=southInset, cropInset = NULL,
  lty=0)
scaleBar(crs=mapMerc,  seg.len=35, pos='center')
sRes = scaleBar(mapMerc, 'bottomleft', cex=2)

scaleCentre = SpatialPoints(
  cbind(Re(sRes$out$textxy), Im(sRes$out$textxy)), 
  proj4string=crs(mapMerc))
if(haveRgdal & require('geosphere', quietly=TRUE)){
  scaleCentre = spTransform(
    scaleCentre, 
    crsLL
  ) 
  circle = SpatialPoints(
    geosphere::destPoint(
      scaleCentre@coords,
      seq(0,360,len=100),
      1000
    ),
    proj4string = crsLL)
  circle = spTransform(circle, crs(mapMerc))
  points(circle, cex=0.3, col='red')
}

mapMercFine = openmap(rockMerc, buffer=100, crs=NA)

map.new(mapMercFine)
plot(mapMercFine, add=TRUE)
points(rockMerc, col='blue',cex=5)
insetMap(crs=mapMercFine, 
  pos='bottomright', 
  map=southInset, cropInset = NULL,
  lty=0)
scaleBar(mapMercFine, 'bottomleft')

if(haveRgdal) {

  mapLL = openmap(waterhouseLL, buffer=0.02)

  map.new(mapLL)
  plot(mapLL, add=TRUE)
  points(waterhouseLL, pch=3, cex=5)
  insetMap(crs=mapLL, 
    pos='bottomright', 
    map=southInset, cropInset = NULL,
    lty=0)
  scaleBar(mapLL, 'bottomleft')
}

if(haveRgdal) {
  mapLLfine = openmap(rockLL, zoom=19, buffer=0.0002)  
  map.new(mapLLfine)
  plot(mapLLfine, add=TRUE) 
  points(rockLL, col='blue', pch=3, cex=5)
  scaleBar(mapLL, 'bottomleft')

}