[R] Adding points to a topo map

[Frede Aakmann Tøgersen]

Hi

Why didn't you google for "maps in R"?

Both the help pages for the GEOmap functions and the accompanying vignette for GEOmap clearly show how you should ad e.g. points to a map.

Here is what you could have done after a careful  reading of the documentation.

library(geomapdata)
data(japmap)

plotGEOmap(japmap)

points(139, 35.5, col = "red", pch = "*", cex = 5)

Or this:

PLOC=list(LON=c(137.008, 141.000), LAT=c(34.000, 36.992),
    x=c(137.008, 141.000), y=c(34.000, 36.992) )

PROJ = setPROJ(type=2, LAT0=mean(PLOC$y) , LON0=mean(PLOC$x) )
     
plotGEOmapXY(japmap, LIM=c(PLOC$LON[1], PLOC$LAT[1],PLOC$LON[2],
                         PLOC$LAT[2]) , PROJ=PROJ, add = FALSE )

pointsGEOmapXY(lon = 139, lat = 35.5, PROJ = PROJ, col = "red", pch = "*", cex = 5)


Yours sincerely / Med venlig hilsen


Frede Aakmann Tøgersen
Specialist, M.Sc., Ph.D.
Plant Performance & Modeling

Technology & Service Solutions
T +45 9730 5135
M +45 2547 6050
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> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
> On Behalf Of kshel
> Sent: 22. marts 2014 00:18
> To: r-help at r-project.org
> Subject: [R] Adding points to a topo map
> 
> Hello R Users,
> 
> 
> I am trying to create a topographical map of Argentina with data
>  points showing the location of 5 species. I first created a map using
> map() with points using latitude and longitude data for all 5 species as
> follows:
> 
> 
> library(maps)
> 
> 
> # Latitude / longitude coordinates of the 5 species:
> 
> lat<-c(-44.000, -43.000, -26.000, -33.000, -36.000)
> 
> lon<-c(-68.000, -70.000, -67.000, -61.000, -68.000)
> 
> 
> map(regions='AR', xlim=c(-75, -53), ylim=c(-56, -20), las=1)
> 
> map.axes()
> 
> points(lon, lat, pch=20, col="gray50", cex=1.8)
> 
> 
> 
> This map does not give me the topographical relief I wanted, so I tried
> using the following code, which first downloads elevation information
> from NOAA and then creates a topo map of southern South American that
> includes Argentina:
> 
> 
> library(geomapdata)
> 
> library(GEOmap)
> 
> 
> data <- file(description =
> "http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO5/TOPO/ETOPO5/ETO
> PO5.DAT", open = "rb", blocking = TRUE, encoding = getOption("encoding"),
> raw = FALSE)
> 
> 
> data(ETOPO5)
> 
> 
> PLOC=list(LON=c(-80.000,-50.000),LAT=c(-56.000,-20.000), x=c(-80.000,-
> 50.000), y=c(-56.000,-20.000) )
> 
> PROJ = setPROJ(type=2, LAT0=mean(PLOC$y) , LON0=mean(PLOC$x) )
> 
> COLS = settopocol()
> 
> JMAT = GEOTOPO(ETOPO5, PLOC, PROJ, COLS$calcol, nx=1000, ny=1000,
> nb=8, mb=8, hb=12, PLOT=TRUE)
> 
> 
> 
> I have attempted to add the 5 species points to this second
> map in a number of different ways, but I haven't been able to figure it
> out. In addition, I can not find documentation for how to do this in the
>  GEOmap pdf or online. Can someone please help me add these lat / long
> points to the topo map?
> 
> 
> Thank you in advance for your time and help.
> 
> K. Sheldon
> 
> 
> 
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Adding-points-
> to-a-topo-map-tp4687330.html
> Sent from the R help mailing list archive at Nabble.com.
> 	[[alternative HTML version deleted]]
> 
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