Abstract
Solar Induced Chlorophyll Fluorescence (SIF), can be used as an indicator of stress in vegetation. Several scientific approaches have been made and there is considerable evidence that steady state Chlorophyll fluorescence is an accurate indicator of plant stress hence a reliable tool to monitor vegetation health status. Retrieval of Chlorophyll fluorescence provides an insight into photochemical and carbon sequestration processes within vegetation. Detection of Chlorophyll fluorescence has been well understood in the laboratory and field measurement. Fluorescence retrieval methods were applied in and around the atmospheric absorption bands 02B (Red wavelength) approximately 690 nm and 02A (Far red wavelengths) 740 nm. Hyperion satellite images were acquired for the years 2012 to 2015 in different seasons. Atmospheric corrections were applied using the 6S Model. The Fraunhofer Line Discrimanator (FLD) method was applied for retrieval of SIF from the Hyperion images by measuring the signal around the absorption bands in both vegetated and non vegetated land cover types. Absorption values were extracted in all the selected bands and the fluorescence signal was detected. The relationships between NDVI and Fluorescence derived from the satellite images are investigated to understand vegetation response within the absorption bands.
Highlights
Retrieval of fluorescence signal provides a unique understanding of global vegetation photosynthesis cycle as there is no specific space based observation platform measuring vegetation fluorescence (Moreno et al, 2006)
4.1 NDVI Extraction We summarize our results according to four seasons which are; (a) December, January, February (Winter season, DJF)
Solar Induced Chlorophyll Fluorescence (SIF) in the O2-A and O2-B spectral wavelength regions was retrieved using the Frauhonfer Line Depth (FLD) method after applying preprocessing tasks. For this we selected 10 sites based on canopy cover (CC) of forest (CC > 75%)
Summary
Retrieval of fluorescence signal provides a unique understanding of global vegetation photosynthesis cycle as there is no specific space based observation platform measuring vegetation fluorescence (Moreno et al, 2006). SIF is the direct indicator of canopy photosynthesis and gives quantitative measure of carbon sinks (Coops, 2015). SIF technique consider to be very fast and sensitive approach for the detection of physiological response of vegetation cover (Guanter et al, 2014). Red and far red fluorescence bands are more suitable to measure vegetation health. In Frauhonfer Line Depth (FLD) method, SIF is calculated in radiance unit by considering the Sun irradiance. Radiative properties of the leaves of the plant affect the reflectance from canopies of vegetation. Fluorescence signal can be detected in the atmospheric absorption bands (Guanter et al, 2007)
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