mercator: Mercator projection

In geo: Draw and Annotate Maps, Especially Charts of the North Atlantic

Description

Mercator projection.

Usage

mercator(lat, lon, scale = "km", b0 = 65)

Arguments

lat, lon	Coordinates as latitude and longitude vectors
scale	Scale of the output, "km" default, all other values imply nautical miles.
b0	Latitude defining the projection.

Value

List of components:

lat, lon	Coordinates in latitude and longitude
x, y	Input coordinates (projected)
scale	Scale
projection	Projection (stated redunantly)
b0, L0	Defining lat and a null value ???

is returned invisibly.

Note

Needs elaboration, could/should (?) be documented with other projection functions.

See Also

Called by geoarea, gridaxes and Proj.

geo documentation built on May 2, 2019, 5:22 p.m.