This is a really interesting project from Nerds for Nature:
On September 8, 2013, 3,111 acres around the summit of Mt. Diablo went up in flames. While the charred landcape can appear alarming, fire is actually a natural part of the mountain’s ecology, and many plants actually require fire to reproduce. We’re trying to monitor how the landscape is changing and recovering after the fire by taking pictures from fixed locations for 1 year after the fire.
People are asked to take photos from fixed areas around the location. I think it’s a great use of crowdsourcing – I’d definitely take part if there was something that like that where I live.