Estimation of Solar Induced Chlorophyll Fluorescence from EO-1 Hyperion

Solar induced Chlorophyll Fluorescence (CF) is an effective indicator for plant photosynthetic activity status and is directly related to O2-A absorption feature. In this study the CF intensity is estimated from spaceborne sensor, EO-1 Hyperion. The surface reflectance image is derived by atmospheric correction using MODTRAN4.0 with concurrent atmospheric parameters provided by the AErosol RObotic NETwork (AERONET) Level 2.0 data. Then, the CF signal is decupled from reflected radiation at canopy level by Fraunhofer Line Discriminator (FLD) principle and corresponding surface reflectance. In turn, some vegetation indices, like Normalized Difference Vegetation Index (NDVI), Modified Soil Adjusted Vegetation Index (MSAVI), Photochemical Reflectance Index (PRI) and Normalized Difference at O2-A absorption Index (NDOI), are derived the from surface reflectance image. Some degree of correlation between these vegetation indices (except for NDVI) and estimated CF signal is expected for vegetated areas and this correlation is much more obvious for grass areas.