Provide more geolocation details

[maltehuebner]

It would be really cool if you could provide more geolocation information like accuracy and the timestamp of the data. The accuracy value would be useful to filter through the geolocation data and throw out all those "somewhere here in a 15 mile radius" users to build a nice timelapse or heatmap.

[cbalster]

At least for the android client, this is handled client-side: Old location fixes and fixes with low accuracy are not sent to the backend.
https://github.com/criticalmaps/criticalmaps-android/blob/master/app/src/main/java/de/stephanlindauer/criticalmaps/managers/LocationUpdateManager.java#L131