GetEdges: Computing the edges of any n-sided regular polygon on a...
In R2G2: Converting R CRAN outputs into Google Earth.

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, nils.arrigo@gmail.com 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

R2G2 documentation built on May 29, 2017, 1:41 p.m.