OSMscale
is an R package to easily handle and project lat-long coordinates,
download background maps and add a correct scale bar to 'OpenStreetMap' plots in any map projection.
There are some other spatially related miscellaneous functions as well.
OSMscale
is available on CRAN:
It relies on OpenStreetMap to do the actual work,
thus rgdal
and rjava
must be available.
-
On Windows: Check if Java is available. There should be no errors when running
install.packages("rJava") ; library(rJava)
in R. If necessary, install Java in the same bit-version as R (eg 64bit). The Java binary file must be on the search path, which will normally happen automatically. -
On Linux: open a terminal (CTRL+ALT+T) and paste (CTRL+SHIFT+V) the following line by line to install gdal and rJava:
sudo apt update
sudo apt install libgdal-dev libproj-dev
sudo apt-get install r-cran-rjava
R
install.packages("rgdal")
library("rgdal"); library("rJava") # should not return errors
q("no") # to quit R
- Now actually install
OSMscale
from within R:
install.packages("OSMscale")
library(OSMscale)
?OSMscale
# To update to the most recent development version:
berryFunctions::instGit("brry/berryFunctions")
berryFunctions::instGit("brry/OSMscale")
Assuming a data.frame with lat-long coordinates:
d <- read.table(sep=",", header=TRUE, text=
"lat, long # could e.g. be copied from googleMaps, rightclick on What's here?
55.685143, 12.580008
52.514464, 13.350137
50.106452, 14.419989
48.847003, 2.337213
51.505364, -0.164752")
png("ExampleMap.png", width=4, height=3, units="in", res=150)
map <- pointsMap(lat, long, data=d, type="maptoolkit-topo", proj=putm(d$long), scale=FALSE)
scaleBar(map, abslen=500, y=0.8, cex=0.8)
lines(projectPoints(d$lat, d$long), col="blue", lwd=3)
points(projectPoints(52.386609, 4.877008, to=putm(zone=32)), cex=3, lwd=2, col="purple")
dev.off()
If direct installation doesn't work, your R version might be too old.
In that case, an update is really recommendable: r-project.org.
If you can't update R, try installing from source (github) via instGit
as mentioned above.
If that's not possible either, you might be able to source
some functions from the
package zip folder
Vectorize(source)(dir("path/you/unzipped/to/OSMscale-master/R", full=T))
This creates all R functions as objects in your globalenv workspace (and overwrites existing objects of the same name!).