How to see if the footprints are new?

Clarity. The newly trodden footprints are generally clear, because they have not been crushed by wind, rain or other objects, and their shapes and textures are obvious, while the old footprints will be somewhat blurred, or even completely disappeared. To judge whether a footprint is a new tread, many factors need to be considered, including clarity, environment, weather conditions and comparison with adjacent footprints.