Applicability of the longitudinal profile–based cirque classification—A test with large cirque datasets in the southeastern Tibetan Plateau
Accurate cirque classification is essential for understanding their formation and palaeoclimatic implications. Longitudinal‐profile‐based cirque classification offers advantages over expert classification and parameter‐based methods. This classification fits exponential or power functions to cirque...
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| Published in: | Earth surface processes and landforms Vol. 49; no. 14; pp. 4709 - 4723 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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Bognor Regis
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01.11.2024
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| ISSN: | 0197-9337, 1096-9837 |
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| Abstract | Accurate cirque classification is essential for understanding their formation and palaeoclimatic implications. Longitudinal‐profile‐based cirque classification offers advantages over expert classification and parameter‐based methods. This classification fits exponential or power functions to cirque profiles, employing linear classifiers based on the exponential coefficient (c‐value) and cirque height, or a threshold approach based on the power coefficient (b‐value) to classify cirques and non‐cirques. However, previous studies were limited to small sample sets. Our study extends this methodology to more extensive datasets on the southeastern Tibetan Plateau, evaluating its effectiveness across two larger sample sets. Both c‐value and b‐value based methods are tested with two classifiers: the original classifier from previous studies and the parameter‐refitted classifier trained by datasets of this study. The results show that the c‐value‐based method effectively classifies typical cirques and non‐cirques, with notable enhancements in performance based on the refitted classifier compared to the original one. The b‐value‐based method with the refitted classifier performs well in typical cirque identification but is less effective for non‐cirques compared to the original classifier. For all‐type cirques and non‐cirques, both methods demonstrated improved performance in non‐cirque classification although there was a slight trade‐off of cirque classification. Additionally, c‐value based non‐linear classifiers and b‐value optimal threshold for classifying cirque and non‐cirque have been developed, and their improved performance in this classification is discussed. Overall, the longitudinal‐profile‐based classification is more effective for typical cirques and non‐cirques, with potentials for further improvement by considering additional spatial structure information of cirques.
In this study, we verified that the longitudinal profile–based cirque classification method is applicable to classify the relatively large cirque and non‐cirque dataset in southeastern Tibetan Plateau, including dataset 1 (256 typical cirques and 101 non‐cirques) and dataset 2 (883 all‐type cirques and 101 non‐cirques). |
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| AbstractList | Accurate cirque classification is essential for understanding their formation and palaeoclimatic implications. Longitudinal‐profile‐based cirque classification offers advantages over expert classification and parameter‐based methods. This classification fits exponential or power functions to cirque profiles, employing linear classifiers based on the exponential coefficient (
c
‐value) and cirque height, or a threshold approach based on the power coefficient (
b
‐value) to classify cirques and non‐cirques. However, previous studies were limited to small sample sets. Our study extends this methodology to more extensive datasets on the southeastern Tibetan Plateau, evaluating its effectiveness across two larger sample sets. Both
c
‐value and
b
‐value based methods are tested with two classifiers: the original classifier from previous studies and the parameter‐refitted classifier trained by datasets of this study. The results show that the
c
‐value‐based method effectively classifies typical cirques and non‐cirques, with notable enhancements in performance based on the refitted classifier compared to the original one. The
b
‐value‐based method with the refitted classifier performs well in typical cirque identification but is less effective for non‐cirques compared to the original classifier. For all‐type cirques and non‐cirques, both methods demonstrated improved performance in non‐cirque classification although there was a slight trade‐off of cirque classification. Additionally,
c
‐value based non‐linear classifiers and
b
‐value optimal threshold for classifying cirque and non‐cirque have been developed, and their improved performance in this classification is discussed. Overall, the longitudinal‐profile‐based classification is more effective for typical cirques and non‐cirques, with potentials for further improvement by considering additional spatial structure information of cirques. Accurate cirque classification is essential for understanding their formation and palaeoclimatic implications. Longitudinal‐profile‐based cirque classification offers advantages over expert classification and parameter‐based methods. This classification fits exponential or power functions to cirque profiles, employing linear classifiers based on the exponential coefficient (c‐value) and cirque height, or a threshold approach based on the power coefficient (b‐value) to classify cirques and non‐cirques. However, previous studies were limited to small sample sets. Our study extends this methodology to more extensive datasets on the southeastern Tibetan Plateau, evaluating its effectiveness across two larger sample sets. Both c‐value and b‐value based methods are tested with two classifiers: the original classifier from previous studies and the parameter‐refitted classifier trained by datasets of this study. The results show that the c‐value‐based method effectively classifies typical cirques and non‐cirques, with notable enhancements in performance based on the refitted classifier compared to the original one. The b‐value‐based method with the refitted classifier performs well in typical cirque identification but is less effective for non‐cirques compared to the original classifier. For all‐type cirques and non‐cirques, both methods demonstrated improved performance in non‐cirque classification although there was a slight trade‐off of cirque classification. Additionally, c‐value based non‐linear classifiers and b‐value optimal threshold for classifying cirque and non‐cirque have been developed, and their improved performance in this classification is discussed. Overall, the longitudinal‐profile‐based classification is more effective for typical cirques and non‐cirques, with potentials for further improvement by considering additional spatial structure information of cirques. In this study, we verified that the longitudinal profile–based cirque classification method is applicable to classify the relatively large cirque and non‐cirque dataset in southeastern Tibetan Plateau, including dataset 1 (256 typical cirques and 101 non‐cirques) and dataset 2 (883 all‐type cirques and 101 non‐cirques). Accurate cirque classification is essential for understanding their formation and palaeoclimatic implications. Longitudinal‐profile‐based cirque classification offers advantages over expert classification and parameter‐based methods. This classification fits exponential or power functions to cirque profiles, employing linear classifiers based on the exponential coefficient (c‐value) and cirque height, or a threshold approach based on the power coefficient (b‐value) to classify cirques and non‐cirques. However, previous studies were limited to small sample sets. Our study extends this methodology to more extensive datasets on the southeastern Tibetan Plateau, evaluating its effectiveness across two larger sample sets. Both c‐value and b‐value based methods are tested with two classifiers: the original classifier from previous studies and the parameter‐refitted classifier trained by datasets of this study. The results show that the c‐value‐based method effectively classifies typical cirques and non‐cirques, with notable enhancements in performance based on the refitted classifier compared to the original one. The b‐value‐based method with the refitted classifier performs well in typical cirque identification but is less effective for non‐cirques compared to the original classifier. For all‐type cirques and non‐cirques, both methods demonstrated improved performance in non‐cirque classification although there was a slight trade‐off of cirque classification. Additionally, c‐value based non‐linear classifiers and b‐value optimal threshold for classifying cirque and non‐cirque have been developed, and their improved performance in this classification is discussed. Overall, the longitudinal‐profile‐based classification is more effective for typical cirques and non‐cirques, with potentials for further improvement by considering additional spatial structure information of cirques. |
| Author | Qin, Cheng‐Zhi Fu, Ping Jia, Tian |
| Author_xml | – sequence: 1 givenname: Tian orcidid: 0000-0003-2086-0633 surname: Jia fullname: Jia, Tian organization: Chinese Academy of Sciences – sequence: 2 givenname: Ping orcidid: 0000-0002-3759-9403 surname: Fu fullname: Fu, Ping email: ping.fu@nottingham.edu.cn organization: University of Nottingham Ningbo China – sequence: 3 givenname: Cheng‐Zhi orcidid: 0000-0002-5910-9807 surname: Qin fullname: Qin, Cheng‐Zhi organization: Shaanxi Normal University |
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| Cites_doi | 10.1111/j.0435-3676.2004.00228.x 10.1016/j.geomorph.2022.108183 10.1016/j.geomorph.2023.108688 10.2307/1550611 10.1007/BF00994018 10.1016/j.earscirev.2015.10.004 10.1111/bor.12295 10.1016/j.quascirev.2012.12.009 10.1127/zfg/39/1995/175 10.1016/j.geomorph.2012.10.030 10.1007/978-0-387-21606-5 10.1111/j.0435-3676.2000.00132.x 10.1016/j.geomorph.2019.106988 10.1080/04353676.1968.11879785 10.1016/j.quaint.2014.07.005 10.13031/2013.23153 10.1016/j.geomorph.2011.11.014 10.1016/j.geomorph.2016.11.018 10.1016/j.geomorph.2023.108982 10.1016/j.palaeo.2021.110656 10.1016/j.geomorph.2020.107391 10.7522/j.issn.1000-0240.2022.0104 10.1127/zfg_suppl/2016/0329 10.1127/0372-8854/2009/0053-0047 10.2307/520796 10.1007/s11430-012-4514-0 10.3390/ijerph192013104 10.1016/j.geomorph.2021.108059 10.1002/esp.4810 10.1130/G21265.1 10.1016/j.geomorph.2006.11.008 10.1002/esp.4688 10.1016/j.patrec.2005.10.010 10.1016/j.quascirev.2004.10.014 10.1016/j.epsl.2017.12.045 10.1002/esp.1327 10.1016/j.geomorph.2006.02.013 10.2307/520939 10.1038/nclimate1580 |
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| Title | Applicability of the longitudinal profile–based cirque classification—A test with large cirque datasets in the southeastern Tibetan Plateau |
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