R: Correct the Wrapping problem

fixCoastwrap {GEOmap} | R Documentation

## Correct the Wrapping problem

### Description

Correct wrapping for GEOmaps

### Usage

    fixCoastwrap(Z, maxdis = 100)

### Arguments

`Z` | list of x, y
`maxdis` | maximum distance for differences

### Details

Based on mapswrap program

### Value

List:

`x` | x-coordinates (longitudes)
`y` | y-coordinates (latitudes)

### Author(s)

Jonathan M. Lees<jonathan.lees@unc.edu>

### Examples

    data(coastmap)
    SEL = which(coastmap$STROKES$nam=="AFROASIA")

    A = ExcludeGEOmap(coastmap, SEL, INOUT="in")

    plot(A$POINTS$lon, A$POINTS$lat, type='n')

    points(A$POINTS$lon, A$POINTS$lat, pch='.')

    ######  note that the map wraps around.

    B = fixCoastwrap(list(x=A$POINTS$lon, y=A$POINTS$lat), 100)
     which(is.na(B$x))

    lines(B)

    polygon(B, col=rgb(.8,1, .8))

[Package GEOmap version 2.4-0 Index]