Blog Archives

recogeo: A new R package to reconcile changing geographies boundaries (and corresponding variables)

February 1, 2019
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recogeo: A new R package to reconcile changing geographies boundaries (and corresponding variables)

Demographics information is usually reported in relation to precise boundaries: administrative, electoral, statistical, etc. Comparing demographics information reported at different point in time is often problematic because boundaries keep changing. The recogeo package faciliates reconciling boundaries and their data by a spatial analysis of the boundaries of two different periods. In this post, I explain

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Are you parallelizing your raster operations? You should!

January 17, 2019
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Are you parallelizing your raster operations? You should!

If you plan to do anything with the raster package you should definitely consider parallelize all your processes, especially if you are working with very large image files. I couldn’t find any blog post describing how to parallelize with the raster package (it is well documented in the package documentation, though). So here my notes. Load

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How to (quickly) enrich a map with natural and anthropic details

August 9, 2018
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How to (quickly) enrich a map with natural and anthropic details

In this post I show how to enrich a ggplot map with data obtained from the Open Street Map (OSM) API. After adding elevation details to the map, I add water bodies and elements identifying human activity. To highlight the areas more densely inhabitated, I propose to use a density-based clustering algorithm of OSM features.

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Explicit semantic analysis with R

April 26, 2016
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Explicit semantic analysis with R

Explicit semantic analysis (ESA) was proposed by Gabrilovich and Markovitch (2007) to compute a document position in a high-dimensional concept space. At the core, the technique compares the terms of the input document with the terms of documents describing the concepts estimating the relatedness of the document to each concept. In spatial terms if I

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