Description Usage Arguments Details Value Author(s) References See Also

Provides the edges coordinates for one n-sided regular polygon, corrected to account for the earth curvature.

1 | ```
GetEdges(center, radius, nedges, orient = 45)
``` |

`center` |
The geographical position of the polygon as c(lon, lat) in decimal degrees. |

`radius` |
The polygon radius (in meters). |

`nedges` |
The number of edges (3 -> triangle, 4 -> square, etc). |

`orient` |
The rotation factor of the polygon (in degrees). |

Earth-curvature corrections are assuming a sphere, hence expect some deformations near to the poles. In addition, polygons that overlap with the poles will have missing values (i.e. when center coordinates + radius lead to overeach a pole).

Provides an array of coordinates for the n-edges defining the desired polygon (lines = points delimiting the polygon, columns = lon, lat in decimal degrees).

Nils Arrigo, [email protected] 2012 EEB, the University of Arizona, Tucson

This function was retrieved as a PHP code from http://blog.thematicmapping.org/ This is an amazing blog; the R2G2 dvpt team thanks a lot Bjorn Sandvik for his outstanding implementations in Google Earth, and for sharing his great ideas and resources. GetEdges is actually an R implementation of his material.

```
Hist2GE
Pies2GE
Shapes2GE
curvy
```

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