Fig. 1. Methodology flow of this paper

Fig. 2. Five types of waveform distribution

Fig. 3. Deviation of amplitude between two adjacent points (∆A)

Fig. 4. Decay constant ( \begin{document}$ a $\end{document})

Fig. 5. Waveform feature distribution

Fig. 6. Waveform feature distribution

Fig. 7. ALB study area location

Fig. 8. Feature importance ranking result

Fig. 9. Accuracy statistics for different feature combinations

Fig. 10. Box figures of waveform important feature distributions

Fig. 11. Confusion matrix for the five waveform classifications

Fig. 12. Results of waveform classification in the study area

Fig. 13. Figure of waveform classification results in the experimental area