Option to display "heat map" of incidents, rather than pins

[zarino]

As a council safety officer, I want to search for a location and then see which roads or intersections there are the most dangerous, so that I can factor those areas into my safety reports and recommendations.

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Google Maps does this really nicely with their traffic estimates:

I’m guessing this would be hard for us to replicate, without the underlying road vector data. But I figured it was worth mentioning!

[davea]

This is a really nice idea!

without the underlying road vector data

Assuming we did have it (the map is just OSM after all), how could we do this?

[davea]

This blog post outlines a mechanism for calculating styles on a per-segment basis in QGIS - might be useful as a starting point for further exploration:

[davea]

A bit of fiddling around in QGIS results in this:

(aside, this really makes cycling in London look fun)

This was using the Collideoscope/Stats19 reports to date, on top of OS road data. So in principle it's possible.

[davea]

Done and deployed.

[davea]

The code for this is in mysociety/collideoscope-heatmap.