Today I had some fun exporting all my recorded Garmin tracks and plotting them as a heatmap on Google Maps.
After having wanted to create a map like this for ages, I finally found some time to hack together the toolchain needed. If you want to do the same, the easiest way I’ve found was:
#1 Ask Garmin for an export of all your data: https://www.garmin.com/en-US/account/datamanagement/
#2 Use the fabulous https://github.com/polyvertex/fitdecode to extract the lat/longs of your tracks.
#3 Use the Google Maps heatmap API to plot the data: https://developers.google.com/maps/documentation/javascript/reference/visualization
Alternatively, drop me a line, and I’d be happy to help 🙂
You might wonder how to plot all your tracks on a map – which is what I initially started with. However, with 346 recorded activities, using kml to plot them (through various platforms) I found it difficult to navigate the result. – If you’d like to get your fit files converted to kml to play around with them, also drop me a note, I have a converter for that too.
A close up view (without adjusting radius, maxIntensity,.. so not optimal):
Update: I’ve uploaded the script to generate a javascript include on github: https://github.com/musings-hub/garmin-fit-to-heatmap-js 🙂
Update: I’ve updated the script to generate content to run on jsfiddle: https://www.musings.ch/2020/02/26/garmin-tracks-heatmap/