Blog Archives

Simplifying spatial polygons in R

February 20, 2012
By
Simplifying spatial polygons in R

Polygon simplification is something others have written about, using R packages such as shapefiles. This explores how package ‘rgeos’ uses the Ramer–Douglas–Peucker algorithm, a method commonly used in GIS systems for simplifying shapefiles. It works by imposing a deviation tolerance … Continue reading →

Read more »

Geopolitics

January 30, 2012
By
Geopolitics

The graduated symbol schematics below have been created in R (using ‘symbols’). They plot combinations of country territorial and population sizes. Instead of dividing for population density we multiply for a function of both. The total of box areas is … Continue reading →

Read more »

Flight mapping in R

January 23, 2012
By
Flight mapping in R

This map has been produced before (and much better) by others but who cares. This effort was achieved purely via the standard R plot function*. I believe the only departure from predecessor maps has been to order the list by … Continue reading →

Read more »