Posts tagged data visualization

Climb Analysis Tool

:: racket, activitylog2, data visualization

As part of preparing for a bicycle race in my local city I wanted to look at the climbs of the bike route and evaluate their difficulty. Since all the (free) online tools only provided basic analysis tools, I decided to write my own.


Plot Animations

:: racket, data visualization

There is no specific animation function in the Racket plot package, but animations can be build by repeatedly plotting individual frames onto a canvas or image using plot/dc. The technique requires drawing the entire plot every frame, which will be inefficient for complex plots. In this blog post we explore how to construct plot animations using the set-overlay-renderers method of a plot snip, which is a more efficient method when plots are embedded in GUI applications.


Rendering the World Map Using the Racket Plot Package

:: racket, data visualization

As part of writing the geoid package, I needed to visualize some geographic projections and I discovered that the 3D plotting facilities in the racket plot package can be easily used for this task. The geoid package and the projection it uses is somewhat complex, so, to keep things simple, this blog post covers the display of the country outlines on a globe loading the data from the GeoJSON file and using only basic plotting facilities.


Dual Axis Plots

:: racket, data visualization

… in which we explore how to show on the same plot two data series that have different data ranges. The Racket Plot package does not support this functionality directly, but with the help of some data transformation, we can still achieve good results.


Interactive Maps in the DrRacket REPL

:: racket, data visualization

I updated the map-widget package to allow map objects to snip%’s so it can be inserted into a pasteboard% and a side benefit of this work is that maps can now be embedded in the DrRacket REPL — while this was not why I did these modifications, it does make for a cool demo.


Timezone Visualization

:: racket, data visualization

The timezone-boundary-builder project publishes GeoJSON files with timezone boundaries based on OpenStreetMap data, and I though it would be an interesting project to load this data in Racket, build some map visualizations with it and explore some of the Racket drawing facilities.


Building a Data Visualization Dashboard in Racket

:: racket, activitylog2, data visualization

When experimenting with a new data visualization or data analysis method, it is simpler to write a prototype as a separate application, to evaluate if it is worthwhile investing the effort of adding a full feature to ActivityLog2, this post illustrates the process used to write a “training load” dashboard application in Racket.


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