Fig. 9: Location of the study area and dataset positions. | npj Clean Water

Fig. 9: Location of the study area and dataset positions.

From: A framework for tracing the sources of nitrate in surface water through remote sensing data coupled with machine learning

Fig. 9

a The matching point of each data set with the satellite and study area location. The yellow triangle represents the study area used to construct the long time series and UAV sampling. b The location of the sampling points on the LJ reservoir. c The location of the sampling points on the QW reservoir. d The location of the sampling points on the NS reservoir. In both (b, c, d), the blue dots represent ground sampling sites on October 26, 2021 (dry season), the yellow dots represent ground sampling sites on July 13, 2022 (rainy season). e RedEdge-MX Blue Dual 10 channels multispectral camera. f DJI M300 RTK unmanned aerial vehicle platform. g Radiation calibration panel.

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