Infrared photography can help in assessing plant health, and has been used on satellites and planes for agricultural and ecological assessment primarily by vineyards, large farms and large-scale (read: expensive) research projects. By creating and open-sourcing a low-cost near-infrared camera and working with wetlands advocates, farmers and environmental activists, the Public Lab community has begun to explore grassroots uses for this powerful analytic technique.
As featured in Chapter 2 of Citizen Science by Caren Cooper.