*2.3. The Acquiring and Processing of Sentinel-2 Data*

Sentinel-2 covers spectral information in 13 bands, including visible light, nearinfrared, red-edge, and short-wave infrared. The Sentinel-2 images are directly extracted from the processed surface reflectance product (COPERNICUS/S2\_SR) through the Google Earth Engine (GEE) platform. To match the date of field data and consider the influence of cloud coverage of remote sensing images in the study area, the product date is selected from 1 July 2020 to 31 August 2020. The declouding process uses the method officially announced by the GEE to directly mask out the pixels whose pixel\_QA band pixel attributes are 3 and 5. Following cloud removal, the overlaid images were medianized using the median function, followed by coordinate system matching and resampling to 30 m resolution.
