R: Map Limits

maplim {GEOmap} | R Documentation

## Map Limits

### Description

Set reasonable map limits from a set of Lat-Lon pairs.

### Usage

    maplim(lat, lon, pct = 0.1)

### Arguments

`lat` | vector of latitudes
`lon` | vector of longitudes
`pct` | percent fraction to increase (or decrease) limits

### Details

In some (GEOmap) programs the longitude needs to be modulus 360, so these are provided also.

### Value

list of range of lats and lons

`lat` | lat limits
`lon` | lat limits
`LON` | lon limits modulus 360
`lim` | vector: lon1 lat1 lon2 lat2
`LIM` | vector: lon1 lat1 lon2 lat2, with lon limits modulus 360

### Author(s)

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

### See Also

expandbound, plotGEOmapXY

### Examples

    lat = rnorm(10, m=46, sd=2)
    lon = rnorm(10, m=-121, sd=1)

    M = maplim(lat, lon, pct=.2)

    plot(M$lon, M$lat, type='n')
    points(lon, lat)

    ############   plotting with a GEOmap
    library(geomapdata)
    data(worldmap)

    PROJ = setPROJ(type=2, LON0=mean(lon), LAT0=mean(lat))

    plotGEOmapXY(worldmap, LIM=M$LIM)
    pointsGEOmapXY(lat, lon,PROJ =PROJ,  pch=6)

[Package GEOmap version 2.4-0 Index]