R: Orthogonal Map Projection

ortho.proj {GEOmap} | R Documentation

## Orthogonal Map Projection

### Description

Orthogonal Map Projection

### Usage

    ortho.proj(lat, lon, lon0, lat1, R)

### Arguments

`lat` | latitude, degrees
`lon` | longitude, degrees
`lon0` | view origin longitude, degrees
`lat1` | view origin latitude, degrees
`R` | Radius of sphere, default=1

### Details

Assumes spherical globe. This function is not part of the normal GEOmap plotting routines.

### Value

list

`x` | x, coordinate in units of R
`y` | y, coordinate in units of R

### Author(s)

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

### References

Snyder, John P., Map Projections- a working manual, USGS, Professional Paper, 1987.

### See Also

GLOBE.ORTH, setPROJ, projtype

### Examples

    olat = 0
             olon = 0

              tlat = 23
             tlon = 30
    R = 1
    ortho.proj(tlat, tlon, olon, olat, R)

[Package GEOmap version 2.4-0 Index]