Some of you may already use the daily and weekly change view of Opensnowmap.org to check for changes on the ski pistes they mapped.
Today, this view have been improved and now gives more information about the actual change. Is this a way, a relation deleted, a simple node moved? A new processing associated with a detailed legend will help to better understand the changes and maybe spot errors.
changes_legend.png

See, yesterday apparently someone seems to have refined a nicely mapped skating ring.

Refined_skating_ring.png

This view coupled with the select_thin_64.png button will allow you to find more information about the modified element. It is still a bit frustrating not to be able to check on deleted elements, I will try to add daily and weekly .html change list to allow this.

In practice, each night, the pistes of the OpenStreetMap database at 00:00 GMT are compared to the pistes that were there the day and the week before. Geometries are simplified in order not to display to much information.