Feb 12, 2018 · MAP OVERLAY, POINT-IN-POLYGON ANALYSIS WITH SP "OVER" FUNCTION • Packages "sp", "rgdal" and "maps" can turn your R into a GIS • Read-Write and Analyze spatial data,. My objective is to create a regular polygon grid over the extent of a polygon, but rotated by a user-defined angle.I know that I can easily create a North/South polygon grid in sf using for. This example simply plots arbitrary x, y, and z data and provides an example of the use of addTernary. In contrast to addPiper, addTernary requires values for all of the x, y, and z arguments. The data returned in the output from ternaryPlot are components called x and y, which are the transformed data for plotting in the triangular plot.Gibbs, Ray, Troll & KJ are students at an elite boarding.