lonlat2map {oce} | R Documentation |
Convert from longitude and latitude to x-y coordinates
lonlat2map(longitude, latitude, projection="")
longitude |
a vector containing decimal longitudes, or a list containing
items named |
latitude |
a vector containing decimal latitude (ignored if
|
projection |
optional indication of projection. This must be character
string in the format used by the rgdal package; see
|
If a projection is already being used (e.g. as set by
mapPlot
) then only longitude
and latitude
should
be given, and the other arguments will be inferred by lonlat2map
. This
is important because otherwise, if a new projection is called for, it will
ruin any additions to the existing plot.
A list containing x
and y
.
Dan Kelley
mapLongitudeLatitudeXY
is a safer alternative, if a map has
already been drawn with mapPlot
, because that function cannot
alter an existing projection. map2lonlat
is an inverse to
map2lonlat
.
## Not run: library(oce) ## Cape Split, in the Minas Basin of the Bay of Fundy cs <- list(longitude=-64.49657,latitude=45.33462) xy <- lonlat2map(cs, projection="+proj=merc") map2lonlat(xy) ## End(Not run)