mapasp | R Documentation |

Calculate aspect ratio for plotting geographic maps; create nice degree axis labels

```
mapasp(data, xlim, ylim)
degreeLabelsEW(x)
degreeLabelsNS(x)
```

`data` |
object of class or extending |

`xlim` |
the xlim argument passed (or derived from bounding box) |

`ylim` |
the ylim argument passed (or derived from bounding box) |

`x` |
numeric; values at which tics and marks will be generated |

`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".

the values for `x`

are typically obtained from axTicks

levelplot in package `lattice`

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