i’m Gregor Godbersen, a full-stack developer, entrepreneur, consultant and graduate student in management & technology. Here you will find some thoughts and neat projects. Contact me or see my current project at KlassenNetz.de.
This post is based on a recent problem I encountered while working on an academic problem. We had a frequently changing set of input cases, each describing the layout of a specific transportation problem. The cases were send to an algorithm chain and discussed within the technical documentation. To prevent stale data entering the report, we wanted to create a solution that would use the input files used for the algorithm to also be the source for the report, thus having a single source of truth. The goal was to replicate the following illustration using only a CSV file containing the coordinates and types of the nodes using LaTeX and PGF/TikZ. (LaTeX is a wordprocessor and markup language that focuses strongly on separating content and layout while TikZ allows for the creation of vector graphics within LaTex using an descriptive language.)Read more
I wanted to visualize the paths taken by riders of the Munich bike sharing system. Unique about this system is that there are no fixed stations as bikes can be rented and returned at any street corner within the city limits, resulting in much more interesting data than in station based systems. As the bikes register their coordinates when free, repeated polling of the free bikes on the systems website and tracking their locations can give fairly accurate measures about the trips taken. I used open street maps cycle path data to turn the start and end locations into approximations of the taken routes. This allows for several statistics to be made about the driving habots, however the most fun was a live replay using the recovered times and routes which I have embedded below. Note: This is a write up of a project I did in 2014 so the data is a bit olderRead more
While standard PDF annotations are well supported in PDF clients and browser plugins, they do not allow for rich annotations in an web context. For this project I explore the possibilities of an online presentation annotator. The basic idea was to allow users to mark sections within each slide and to attach a written note to it. For the rendering of the PDF, two different modes were tried, one that pre-renders the pages as images and provides meta information through an JSON file, the other using Mozilla’s PDF.js to render the PDF pages directly in the client.Read more
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