mapasp

0th

Percentile

Calculate aspect ratio for plotting geographic maps

Calculate aspect ratio for plotting geographic maps

Keywords
dplot
Usage
mapasp(data, xlim, ylim)
Arguments
data
object of class or extending Spatial
xlim
the xlim argument passed (or derived from bounding box)
ylim
the ylim argument passed (or derived from bounding box)
Value

  • mapasp is used for the aspect argument in lattice plots and spplot;

    let x = dy/dx, with dy and dx the y- and x-size of the map.

    let s = 1/cos((My * pi)/180) with My the y coordinate of the middle of the map (the mean of ylim)

    for latlong (longlat) data, mapasp returns s * x. for other data, mapasp returns "iso".

See Also

levelplot in package lattice

Aliases
  • mapasp
Documentation reproduced from package sp, version 0.9-93, License: GPL (>= 2)

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