JOSM Strava Heatmap

Description

This browser extension adds a button to the Strava Global Heatmap that
copies the TMS imagery url for use in the Java OpenStreetMap Editor(JOSM).

Accessing this imagery externally requires a set of key parameters that you obtain by signing into the Strava website, copying the values from several cookies, and then assembling into a query string at the end of the url. The keys expire after a week or so at which point you must repeat the process. This extension builds the url for you which makes this weekly process a bit less annoying.

Instructions
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1. Visit strava.com/heatmap and log in – sign up for a free account if you don't have one
2. Optional - Select the heatmap color and activity type you want to use
3. Click the button pictured below to copy the TMS imagery url prepopulated with the required
`Key-Pair-Id`, `Policy`, and `Signature` parameters
4. Paste the copied url into a custom imagery layer in JOSM or iD (remove the `tms:` prefix
for iD - see editor specific sections below)

Using the imagery in JOSM
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Add a new TMS layer in the JOSM imagery preferences. Name it Strava Heatmap and paste in the copied url. If you are updating an expired Strava Heatmap layer you can just double-click it to replace url in the list view.

Using the imagery in iD
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Open the Backgrounds panel and select "Custom" at the bottom. Paste the copied url into the Custom Background Settings window that opens. Remove the `tms:` prefix at the beginning of the url so it just starts with `https://heatmap-external- ...`. This prefix is necessary for JOSM but must be removed for iD.