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A high-resolution global leaf chlorophyll content product using the Sentinel-2 data.
Hu Zhang1, Jing Li2,3, Chenpeng Gu4,5
1State Key Laboratory of Remote Sensing and Digital Earth, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100101, China.
This study introduces a new high-resolution Leaf Chlorophyll Content (LCC) product, MuSyQ Global LCC, using Google Earth Engine. The product offers finer spatial details for carbon cycle research.
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Area of Science:
- Earth and Environmental Sciences
- Remote Sensing
- Plant Physiology
Background:
- Leaf Chlorophyll Content (LCC) is vital for estimating photosynthetic carbon assimilation and understanding the terrestrial carbon cycle.
- Existing global LCC remote sensing products have limited resolution (300m-500m), restricting detailed spatial analysis.
Purpose of the Study:
- To develop a higher-resolution global Leaf Chlorophyll Content (LCC) product using multi-source satellite data.
- To improve the spatial detail and accuracy of global LCC estimation for carbon cycle studies.
Main Methods:
- Employed an empirical relationship method using the Chlorophyll Sensitive Index (CSI).
- Utilized the Google Earth Engine (GEE) platform for data processing.
- Generated the Multi-source data Synergized Quantitative Global LCC (MuSyQ Global LCC) product with resolutions from 10m to 100m.
Main Results:
- The 10m-resolution MuSyQ Global LCC product achieved an RMSE of 13.69 μg/cm² and R² of 0.37.
- The product revealed finer spatial details compared to existing lower-resolution global LCC datasets.
- When upscaled to 500m, MuSyQ Global LCC showed high consistency with MODIS LCC and higher accuracy (RMSE=14.16 μg/cm²) than MODIS LCC (RMSE=14.74 μg/cm²).
Conclusions:
- The MuSyQ Global LCC product provides a significant advancement in high-resolution LCC mapping.
- This finer resolution LCC data can enhance the accuracy of terrestrial carbon cycle estimations.
- The study demonstrates the capability of GEE in producing high-quality, high-resolution global environmental products.