After meeting Peter today, I decided to finally look at the alpha setting on his openframeworks application we use for lots of our work to explore a possible solution to getting a 3D printer to make a frequency map from a detail of our map. This is the urge that led to the clay and plaster shenanigans I mention here.
Selecting a year in Berlin when we lived in the same area (2010), I tried an alpha setting for the GPS tracks of 5 with the result, when you zoom out, of being able to see quite nicely the most frequently iterated streets and indeed pinpoint our street with ease (see above). It kind of reminds me of Joseph Wright of Derby, with his dramatic sense of lighting and black painting edges.
In the detail, when you zoom in closer (or use a smaller scale to use map language), there is a nice chalky quality to the lines. Hmm – maybe a candidate to blur the lines…?