Even then they would need a valid start point. They are essentially trying to track this person via satellite imagery without a ground truth. What did the terrain features look like just before he passed by and what changed? What would a tracker on the ground expect to see while following someone not trying to hide? A person is not going to change terrain features enough to be detected by mediocre resolution imagery without doing something big and deliberate. It won't see footprints and certainly can't determine boot-size or whether that's the right pair of Danners.

This is how desperation manifests and is another reason to stop, set up camp and get a good smokey fire going. Or carry a PLB and a signal mirror. All of the above?