Visualisation of Geo-Coded Event Stream Data

January 30, 2012 Comments Off on Visualisation of Geo-Coded Event Stream Data

A visualisation of an event stream of geo-coded tweets. This application aggregates geographic points in a grid, and produces a 3D bar chart of intensity levels. Use the mouse to rotate the scene, and to select events on a timeline histogram. Optionally make use of filters to only display subsets of the data (retweets, tweets from specific Twitter clients, tweets in specific languages.)

The Processing source comes with a sample data set.

Visualising Structured Data on Geographic Maps: Evaluating a Hexagonal Map Visualisation

January 30, 2012 Comments Off on Visualising Structured Data on Geographic Maps: Evaluating a Hexagonal Map Visualisation

An important aspect of spatial analysis is the choice of appropriate forms of representation. Choropleth maps are an appropriate, widely-used representation for univariate spatial data sets; but how can data distributions be visualised on geographic maps? I.e., how can one visualise data that has spatial, categorical, and quantitative aspects?

We developed a map-based histogram based on a hexagonal tessellation scheme and will evaluate it with geometric and spatial analysis techniques. Such visualisations can be used to illustrate e.g. cultural differences, as demonstrated here with a data set on language-specific colour naming preferences. Exemplary questions of this data may be: what are the most popular colour categories within a country? How fine or broad are the colour categories for particular hues? Do Spanish-speaking respondents have more fine-grained colour name categories for orange tones than English-speaking ones?

In developing such a visualisation there are a number of challenges to overcome which we will outline below. A fundamental question is whether we can illustrate spatial, categorical, and quantitative aspects (country association, colour names, and colour frequencies) without introducing needless visual clutter. In Edward Tufte’s terms: we will strive for a high data-ink ratio.

Get the report: Hexagonal Maps 2011-12-16

Eye Candy: Sprite Oscillation

January 30, 2012 Comments Off on Eye Candy: Sprite Oscillation

A simple sprite oscillation system involving rhythms of small primes, and rendering feedback loops. Coefficients (36, 35, 32, 24) taken from La Monte Young‘s “The Second Dream of the High-Tension Line Stepdown Transformer”. Very addictive. The Processing source requires the GLGraphics library.

Eye Candy: Particle System

January 30, 2012 Comments Off on Eye Candy: Particle System

A simple particle system involving rhythms of small primes, and rendering feedback loops. The Processing source requires the GLGraphics library.

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