SSG-L1-1 (a) and SSG-L1-3 (b) data exhibit a decreasing trend from January to March and an increasing trend from June to September, possibly due to ambient factors, resulting in a noisy signal over time.
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An Integrated Method for Tunnel Health Monitoring Data Analysis and Early Warning: Savitzky-Golay Smoothing and Wavelet Transform Denoising Processing.
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