Proj: Performs Mercator or Lambert projection of data.
In geo: Draw and Annotate Maps, Especially Charts of the North Atlantic

Description Usage Arguments Value See Also Examples

Performs Mercator, Lambert or no projection of data, as a default it will perform the projection used in current plot.

Proj(a, b = 0, scale = getOption("geopar")$scale,
  b0 = getOption("geopar")$b0, b1 = getOption("geopar")$b1,
  l1 = getOption("geopar")$l1, projection = getOption("geopar")$projection,
  col.names = c("lon", "lat"))

`a,b`	The input data to be projected, may be given as two vectors or as list attributes, \$lat and \$lon (\$x and \$y if projection = none).
`scale`	The scale used for the projection, (m, km or miles). Default is the scale defined in geopar (the scale defined when the plot is initialized).
`b0`	if projection = mercator b0 is the center of the mercator projection. If projection = "Lambert" b0 and b1 are lattitudes defining the Lambert projection. Default are the b0 and b1 defined in geopar.
`b1`	Second defining latitute for Lambert projection
`l1`	The longitude defining the Lambert projection, default is the l1 defined in geopar.
`projection`	The projection of the data, legal projections are "Mercator", "Lambert" and "none".
`col.names`	This has to be set to the default value of c("lon", "lat"), otherwise projection will be set to "none".

The function returns a list containing if projection = "none" x and y, if projection is "Mercator" or "Lambert" it includes the projection (\$projection), the scale (\$scale), \$lat and \$lon and \$x and \$y (the distance in \$scale from point (0,0) in spherical coordinates.

invProj, geopar, geoplot.

# For an example of use for this function see i.e. init() where
  # it is called:
## Not run: 
  xgr <- Proj(lat, lon, scale, b0, b1, l1, projection)

## End(Not run)