Vệ tinh Sentinel-2B (S2B) được phóng thành công lên quỹ đạo đã cùng với Sentinel-2A (S2A) tạo thành một chuỗi cung cấp dữ liệu mặt đất 5 ngày một lần với độ phân giải không gian ở một số kênh lên đến 10m. | Nghiên cứu sử dụng ảnh Sentinel-2B đánh giá mức độ phú dưỡng của hồ Linh Đàm, Quận Hoàng Mai, Hà Nội VNU Journal of Science: Earth and Environmental Sciences, Vol. 35, No. 4 (2019) 88-96 Original Article Using Sentinel-2B Imagery to Estimate the Eutrophication Level of Linh Dam Lake, Hoang Mai District, Hanoi Nguyen Thuy Linh1, , Pham Thi Huong Thao1, Luong Thi Phuong1, Vu Thi Han2, Nguyen Thi Thu Ha1, Pham Quang Vinh3 1 VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam 2 Vietnam construction and CN environment joint Stock, Kien Hung, Ha Dong, Vietnam 3 Institute of Geography, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam Received 10 October 2019 Revised 22 November 2019; Accepted 28 November 2019 Abstract: The successfully launched of Sentinel-2B (S2B) satellite into orbit created the recording frequency on Earth every 5 days with the simulated operating of Sentinel 2A satellite, and provided a high resolution (10m). This study aims to assess the effective application of S2B satellite on water environmental monitoring by using Secchi Disk Depth (SD) and surface water reflectance data, which was collected at the same time of the acquiring local scenes from S2B to establish SD estimated equation of Lake Linh Dam. Result showed that an accurate estimation model for SD in Lake Linh Dam by an exponential function of band 3 versus band 4 ratio (R2 = , RMSE=). Resultant maps of SD distribution over the lake in 2018 and 2019 show that the water quality in Lake Linh Dam reached from the high eutrophication to super eutrophication level. This result is consistent with previous studies on eutrophication state of Lake Linh Dam, confirming the potential application of S2B image for water quality research in Hanoi lakes. Keywords: Lake Linh Dam, eutrophication, TSI, secchi depth, Sentinel-2B. _ Corresponding author. E-mail address: .
