Using Sentinel-2 Images to Map the Populus euphratica Distribution Based on the Spectral Difference Acquired at the Key Phenological Stage

Populus euphratica is an important tree species in desert ecosystems. The protection and restoration of natural forests requires accurate positioning information. use Sentinel-2 images to map the distribution at a large scale faces challenges associated with discriminating between Tamarix chinensis. To address this problem, study selected Daliyabuyi Oasis hinterland Taklimakan Desert as site sought distinguish from First, we determined peak spectral difference period (optimal time window) chinensis within monthly time-series images. Then, appropriate vegetation index was represent key phenological stage. Finally, maximum entropy method used automatically determine threshold distribution. results indicated that 22 April 1 May optimal window for mapping Oasis. combination inverted red-edge chlorophyll (IRECI) can effectively user’s accuracy extraction single-data acquired 0.83, producer’s 0.72, F1-score 0.77. This verified feasibility based on images, analyzed validity exploiting differences stage image two species. be extract serve auxiliary variable other plant classification methods, providing reference plants.