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. 2019 Sep 14;19(18):3972. doi: 10.3390/s19183972

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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DASST result of the tunnel (using the data ID1 in Table 3 and $W_{d} = 100 m m$ ). (a) DASST used for $P_{t u n s^{'}}$ : Sequence h(i) is the mean height of the tunnel sections; $g_{2} (i, t_{2})$ is the discrete sliding cumulative function with step size $t_{2}$ ; $m_{2}$ is the optimal solution of $g_{2} (i, t_{2})$ ; (b) three views of segmentation results of the rock surface.