Extraction of fractional vegetation cover in arid desert area based on Chinese GF-6 satellite,Open Geosciences

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Extraction of fractional vegetation cover in arid desert area based on Chinese GF-6 satellite
Open Geosciences ( IF 2 ) Pub Date : 2021-01-01 , DOI: 10.1515/geo-2020-0241
Zhengdong Deng ₁ , Zhao Lu ₁ , Guangyuan Wang ₁ , Daqing Wang ₁ , Zhibin Ding ₁ , Hongfei Zhao ₂ , Haoli Xu ₁ , Yue Shi ₁ , Zijian Cheng ₁ , Xiaoning Zhao ₁

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The red edge band is considered as one of the diagnosable characteristics of green plants, but the large-scale remote sensing retrieval of fractional vegetation coverage (FVC) based on the red edge band is still rare. To explore the application of the red edge band in the remote sensing estimation of FVC, this study proposed a new vegetation index (normalized difference red edge index, RENDVI) based on the two red edge bands of Chinese GaoFen-6 satellite (GF-6). The FVC estimated by using three vegetation indices (NDVI, RENDVI 1 , and RENDVI 2 ) were evaluated based on the field survey FVC obtained in Minqin Basin of Gansu Province. The results showed that there was a good linear correlation between the FVC estimated by GF-6 WFV data and the FVC investigated in the field, and the most reasonable estimation of FVC was obtained based on RENDVI 2 model ( R 2 = 0.97611 and RMSE = 0.07075). Meanwhile, the impact of three confidence levels (1, 2, and 5%) on FVC was also analyzed in this study. FVC obtained from NDVI and RENDVI 2 has the highest accuracy at 2% confidence, while FVC based on RENDVI 1 achieved the best accuracy at 5% confidence. It could be concluded that it is feasible and reliable to estimate FVC based on red edge bands, and the GF-6 Wide Field View (WFV) data with high temporal and spatial resolution provide a new data source for remote sensing estimation of FVC.

更新日期：2021-01-01

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