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Multispectral vegetation reflectance measurements were used as an indirect method of sensing CO gas leaking from underground in a controlled release experiment in Bozeman, Montana, USA. The leak location is identified through time-series analysis of the reflectances and the normalized difference vegetation index (NDVI), evaluated at a test location and a control location. Vegetation reflectance changes that correlated with root-level CO exposure were distinguishable from changes attributed todoi:10.1109/jstars.2012.2202880 fatcat:7njwrjackrexbddebns7apwgg4