Figure 7: Comparison of camera Gcc and LED sensor NDVI recorded at a Mediterranean grassland (site “vaira”: Vaira Ranch, California).
From: Tracking vegetation phenology across diverse North American biomes using PhenoCam imagery

(a) Time series plots showing the parallel evolution of camera GCC and LED sensor NDVI over the course of 2014. (b) bivariate scatter plot showing moderate seasonal hysteresis (compare day 1-90 vs. day 91-180) in the relationship between camera Gcc and LED sensor NDVI.