tpeqd {mapmisc} | R Documentation |
Defines map projection
tpeqd(x, offset=c(0,0), axis='enu') tpers(x, hKm = 100*1000, tilt = -10, offset=c(0,0), axis='enu')
x |
A SpatialPoints* object of length 2 or a matrix with two columns. |
hKm |
Height veiwing the Earth from |
tilt |
Viewing angle |
offset |
2 coordinates to define the origin |
axis |
defaults to east, north, up. 'swu' would rotateo 90 degrees |
A coordinate reference system is returned
An object of class CRS
.
http://en.wikipedia.org/wiki/Two-point_equidistant_projection https://proj.org/operations/projections/tpers.html
tpeqd(rbind(c(0,0), c(10,50))) data('netherlands') tcrs = tpeqd(nldCities[1:2,]) tcrs if(require('rgdal', quietly=TRUE)) { nldT = spTransform(nldCities, tcrs) projection(nldT) map.new(nldT) text(nldT,labels=nldT$name) scaleBar(nldT, 'topright') }