Blog Archives

velox – Fast Raster Manipulation and Extraction in R

September 11, 2016
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velox – Fast Raster Manipulation and Extraction in R

I’m happy to announce that I’ve recently published the velox R package. velox allows performing common raster operations in R much faster than alternative packages. The following plot provides a brief overview of the speed-up associated with using velox, as opposed to the well-known raster package: velox is on CRAN, so to install you can simply type install.packages("velox") …Read More

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Solving the Map Coloring Problem in R

November 10, 2015
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Solving the Map Coloring Problem in R

In this blog post I explore the question of how to color maps in a way that ensures optimal readability, while using a small set of colors. I also introduce the new MapColoring R package, which provides a practical solution to this problem in a user friendly manner. The Problem In my work, I often encounter …Read More

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Functions for Transferring Vector Data Between PostGIS and R

July 20, 2014
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Functions for Transferring Vector Data Between PostGIS and R

  There are numerous excellent packages to process and analyze spatial data in R. However, when a project involves multiple and/or large spatial data sets, it often makes sense to make use of a spatial database for data management. I use a PostGIS database (which is an extension to the PostgreSQL system) for storing and …Read More

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Supervised Image Classification in R Using Support Vector Machines

March 10, 2013
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Supervised Image Classification in R Using Support Vector Machines

For a project hosted at the ETH Risk Center, a fellow PhD student and I are currently trying to extract and vectorize a large number of cartographic features from a collection of scanned maps. Though the project is still in an early phase, we were already able to do a lot of interesting stuff, and …Read More

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