研究目的
Investigating the use of reflectance and radiative transfer models (RTMs) to estimate the biochemical and structural effects on top-of-canopy (TOC) sun-induced chlorophyll fluorescence (SIF), as a step towards retrieving physiological information from TOC SIF.
研究成果
The study concludes that reflectance provides valuable information to account for biochemical and structural effects on SIF, advancing the analysis of SIF observations. The combination of RTMs, reflectance, and SIF offers new pathways to detect vegetation biochemical, structural, and physiological changes.
研究不足
The study acknowledges the lack of in-situ measurements for direct validation of some retrieved parameters, such as soil information and LIDFb, which could not be accurately retrieved from TOC reflectance. Additionally, the assumption of a constant fluorescence emission efficiency may not fully capture physiological variations.
1：Experimental Design and Method Selection:
The study used radiative transfer models (RTMs) and TOC reflectance to estimate the biochemical and structural effects on TOC SIF. The SCOPE model was used for simulations.
2：Sample Selection and Data Sources:
Airborne reflectance and SIF data were acquired over an agricultural experimental farm in Germany using the HyPlant system. Data were collected on two days, before and during a heat event in summer
3：List of Experimental Equipment and Materials:
20 The HyPlant hyperspectral imaging spectrometer and a thermal camera (VarioCAM) were used.
4：Experimental Procedures and Operational Workflow:
TOC reflectance was calculated from DUAL module data, and TOC SIF was calculated from FLUO module data. The SCOPE model was used to simulate TOC SIF and temperature.
5：Data Analysis Methods:
The approach involved retrieving vegetation parameters from TOC reflectance by inverting the reflectance routine of SCOPE and using these to simulate TOC SIF with a fixed fluorescence emission efficiency.
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