Research on the Inversion Model of TN and NH3-N in Tuotuo River Basin Based on Landsat 8
The inversion relationship was established between the measured values of TN and NH3-N and the reflectivity of the images from Landsat 8 in 41 kinds of band combinations in Tuotuo River basin from June to July 2021.The inversion model was constructed in the form of linear,quadratic polynomial,logarithmic function,expo-nential function and power function by using selected band combinations with high degree of fit and measured values.The results showed that the reflectivity of the images from Landsat 8 in B4,B5,B6 and B7 bands was significantly correlated with TN and NH3-N values.The band combination of B4+B5+B7 had a high degree of fit with TN value,and B6/B7 had a high degree of fit with NH3-N value.The predicted values of TN and NH3-N from the remote sensing images in August 2021 by inversion model were compared with the measured values to verify the model accuracy.The MAE and RMSE of TN inversion model were 13.89％and 0.152 mg/L,respectively.The MAE and RMSE of NH3-N inversion model were 5.87％and 0.077 mg/L,respectively.
TNNH3-NRemote sensing imageInversion modelTuotuo River basin
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