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

Description Usage Arguments Value See Also

Accepts data in spherical coordinates with center lattitude 0 and longitude 0 and performs an inverse Mercator, Lambert or no tranformation.

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invProj(x, y = NULL, scale = getOption("geopar")$scale,
  b0 = getOption("geopar")$b0, b1 = getOption("geopar")$b1,
  l1 = getOption("geopar")$l1, projection = getOption("geopar")$projection)

`x,y`	The input data to be inversely projected, may be given as two vectors or as list attributes (\$x and \$y).
`scale`	The scale of the input date (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, b1 are the latitudes defining the Lambert projection. Default are the b0 and b1 defined in geopar.
`b1`	Second defining latitude for Lambert projection.
`l1`	The longitude defining the Lambert projection, default is the l1 defined in geopar.
`projection`	The projection to be inversed, legal projections are "mercator", "Lambert" and "none". Default is the projection defined in geopar.

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.

invProj, geopar, geoplot.

geo documentation built on May 29, 2017, 5:36 p.m.