tpeqd | R Documentation |
Defines map projection
tpeqd(x, offset=c(0,0), axis='enu')
tpers(x, hKm = 100*1000, tilt = -10, azi, 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 |
azi |
Azimuth, defaults to direction of first two points in x |
offset |
2 coordinates to define the origin |
axis |
defaults to east, north, up. 'swu' would rotateo 90 degrees |
A coordinate reference system is returned
Caracther string representing a crs
.
https://en.wikipedia.org/wiki/Two-point_equidistant_projection https://proj.org/operations/projections/tpers.html
crs
,project
data('worldMap');worldMap=unwrap(worldMap)
thepoints = vect(rbind(cbind(150, -40), cbind(-70,-40)), crs=crsLL)
crsOne = tpeqd(thepoints)
worldMapTrans = wrapPoly(worldMap, crsOne)
oldpar=map.new(crsOne, col='lightblue')
plot(worldMapTrans, add=TRUE, col='grey')
points(project(thepoints, crsOne), col='red')
gridlinesWrap(crsOne, col='orange')
thepoints = vect(rbind(cbind(-40, 65), cbind(139,35)), crs=crsLL)
crsTwo = tpeqd(thepoints)
map.new(crsTwo, col='lightblue')
plot(wrapPoly(worldMap, crsTwo), add=TRUE, col='grey')
points(project(thepoints, crsTwo), col='red')
gridlinesWrap(crsTwo, col='orange')
par(oldpar)
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