)1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; [EMAIL_ADDRESS] (J.H. ); [EMAIL_ADDRESS] (X.L. ); [EMAIL_ADDRESS] (X.L. )1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; [EMAIL_ADDRESS] (J.H. ); [EMAIL_ADDRESS] (X.L. ); [EMAIL_ADDRESS] (X.L. )1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; [EMAIL_ADDRESS] (X.L. ); [EMAIL_ADDRESS] (X.L.G. )1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; [EMAIL_ADDRESS] (J.H. ); [EMAIL_ADDRESS] (X.L. ); [EMAIL_ADDRESS] (X.L. )1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; [EMAIL_ADDRESS] (J.H. ); [EMAIL_ADDRESS] (X.L. ); [EMAIL_ADDRESS] (X.L. )1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; [EMAIL_ADDRESS] (J.H. ); [EMAIL_ADDRESS] (X.L. ); [EMAIL_ADDRESS] (X.L. )1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China; [EMAIL_ADDRESS] (J.H. ); [EMAIL_ADDRESS] (X.L. ); [EMAIL_ADDRESS] (X.L. )1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and The SIF spectrum is a continuous broadband spectrum that covers the approximately spectral range of 650-850 nm. Its spectral shape is characterized by one peak at around 685 nm and another at around 740 nm [1,2]. The emitted SIF is the sum of the chlorophyll fluorescence of photosystem I (PSI) and photosystem II (PSII). PSII contributes to the SIF emission in both the red and far-red spectral regions, whereas PSI contributes to the SIF emission only in the far-red region [3]. As a result, the intensity and shape of the SIF spectrum can reflect the amount of energy absorbed by PSII and PSI [4,5]. In addition, several studies have determined the physics-physiology mechanism connecting function of the photosynthetic apparatus with chlorophyll fluorescence from active florescence induction measurement and demonstrated that the fluorescence signal can be a reliable and observable indicator of the plant's photosynthetic status [4, 5, 6]. To date, extensive SIF-photosynthesis research has focused on investigating the empirical correlations between SIF and GPP, and demonstrated that SIF measurements can offer a promising approach for detecting the terrestrial vegetation's actual photosynthetic activity [7, 8, 9, 10, 11]. Since [PERSON] introduced the Fraunhofer Line Discrimination (FLD) method [12] to extract SIF signals from the observed vegetation-reflected radiance, various studies have demonstrated the possibility of measuring SIF at Fraunhofer lines or atmospheric absorption bands (e.g., an O\({}_{2}\)-B band at approximately 687 nm and an O\({}_{2}\)-A band at approximately 760 nm) on the ground, from airborne platforms, and from satellites (for review, see [13]). Recently, global SIF maps derived from hyperspectral satellite data have become available [14, 15, 16, 17, 18]. Meanwhile, SIF's application for global monitoring of plant photosynthesis has become a hot research area [9, 14, 19]. The soil canopy observation, photochemistry, and energy fluxes (SCOPE) model [20] has become a virtual laboratory for interpreting SIF and investigating SIF-photosynthesis links on diurnal or seasonal scales. With a full physiological representation of photosynthesis and fluorescence, SCOPE has been regarded as a robust deterministic model for interpreting SIF and photosynthesis in various studies.