[R] Adding points to a topo map

[kshel]

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/ETOPO5.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




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[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
fr...@vestas.com
http://www.vestas.com

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