{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:44:44Z","timestamp":1760150684724,"version":"build-2065373602"},"reference-count":39,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2023,12,23]],"date-time":"2023-12-23T00:00:00Z","timestamp":1703289600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The stability of many shallow caves and rock shelters relies heavily on understanding rock discontinuities, such as stratification, faults, and joints. Analyzing these discontinuities and determining their orientations and dispersion are crucial for assessing the overall stability of the cave or shelter. Traditionally, this analysis has been conducted manually using a compass with a clinometer, but it has certain limitations, as only fractures located in accessible areas like the lower part of cave walls and entrances are visible and can be assessed. Over the past decade, remote sensing techniques like LiDAR and photogrammetry have gained popularity in characterizing rocky massifs. These techniques provide 3D point clouds and high-resolution images of the cave or shelter walls and ceilings. With these data, it becomes possible to perform a three-dimensional reconstruction of the cavity and obtain important parameters of the discontinuities, such as orientation, spacing, persistence, or roughness. This paper presents a comparison between the geomechanical data obtained using the traditional manual procedures (compass readings in accessible zones) and a photogrammetric technique called Structure from Motion (SfM). The study was conducted in two caves, namely, the Reguerillo Cave (Madrid) and the Cova dos Mouros (Lugo), along with two rock shelters named Abrigo de San L\u00e1zaro and Abrigo del Molino (Segovia). The results of the study demonstrate an excellent correlation between the geomechanical parameters obtained from both methods. Indeed, the combination of traditional manual techniques and photogrammetry (SfM) offers significant advantages in developing a more comprehensive and realistic discontinuity census.<\/jats:p>","DOI":"10.3390\/rs16010072","type":"journal-article","created":{"date-parts":[[2023,12,24]],"date-time":"2023-12-24T20:48:37Z","timestamp":1703450917000},"page":"72","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Structural and Geomechanical Analysis of Natural Caves and Rock Shelters: Comparison between Manual and Remote Sensing Discontinuity Data Gathering"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2982-759X","authenticated-orcid":false,"given":"Abdelmadjid","family":"Benrabah","sequence":"first","affiliation":[{"name":"ETSI Caminos, Canales y Puertos, Universidad Polit\u00e9cnica de Madrid, C\/Prof. Aranguren, s\/n, 28040 Madrid, Spain"}]},{"given":"Salvador","family":"Senent Dom\u00ednguez","sequence":"additional","affiliation":[{"name":"ETSI Caminos, Canales y Puertos, Universidad Polit\u00e9cnica de Madrid, C\/Prof. Aranguren, s\/n, 28040 Madrid, Spain"}]},{"given":"Fernando","family":"Carrera-Ram\u00edrez","sequence":"additional","affiliation":[{"name":"RAC, Rock Art Conservation and Management, 36202 Vigo, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5752-9007","authenticated-orcid":false,"given":"David","family":"\u00c1lvarez-Alonso","sequence":"additional","affiliation":[{"name":"Department of Prehistory, Ancient History and Archaeology, Complutense University of Madrid, C\/Profesor Aranguren, 28040 Madrid, Spain"}]},{"given":"Mar\u00eda","family":"de Andr\u00e9s-Herrero","sequence":"additional","affiliation":[{"name":"Department of Prehistory, Ancient History and Archaeology, Complutense University of Madrid, C\/Profesor Aranguren, 28040 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2332-5647","authenticated-orcid":false,"given":"Luis","family":"Jorda Bordehore","sequence":"additional","affiliation":[{"name":"ETSI Caminos, Canales y Puertos, Universidad Polit\u00e9cnica de Madrid, C\/Prof. Aranguren, s\/n, 28040 Madrid, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,23]]},"reference":[{"key":"ref_1","unstructured":"Wyllie, D.C., and Mah, C. 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