Detecting Leaf Pulvinar Movements on NDVI Time Series of Desert Trees: A New Approach for Water Stress Detection
Figure 1
Conceptual diagram of the effect of leaf pulvinar movement on the NDVI signal.
(A) NDVI difference between morning and midday (ΔNDVImo-mi) occuring as solar irradiation changes during the day, and (B) NDVI difference between winter and summer (ΔNDVIW-S) occuring as solar irradiation varies between seasons. The time at which the Landsat (5–7), MODIS-Terra, and MODIS-Aqua satellites acquire data is displayed to illustrate the impact of pulvinar movements on the NDVI retrieved from these platforms.