{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T01:10:14Z","timestamp":1773796214792,"version":"3.50.1"},"reference-count":47,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2023,2,3]],"date-time":"2023-02-03T00:00:00Z","timestamp":1675382400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Research Deanship of ESPOL Polytechnic University"},{"name":"Geotechnics Master Program of the Faculty of Engineering in Earth Sciences (FICT, acronym in Spanish) of ESPOL Polytechnic University in Guayaquil, Ecuador"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The 3D point clouds obtained from the low-cost, remote, and precise SfM (Structure from Motion) technique allow the extraction and acquisition of discontinuities and their characteristics both manually, with the compass and virtual ruler of the Cloud Compare software, and automatically with the DSE (Discontinuity Set Extractor) program, which is faster, more accurate, and safe. Some control plans have been used, which basically consist of identifying one or several fractures and taking measurements on them manually and remotely. The difference between both types of measurements is around 5\u00b0, which we believe is reasonable since it is within the precision and repeatability of measurements with a geologist\u2019s compass. This work analyzes the stability of six slopes (five excavated and one natural) by applying five different analysis methodologies based on the rock mass classification system (SMR, RHRSmod, and Qslope), kinematic analysis, and analytical analysis (limit equilibrium). Their results were compared with what was observed in the field to identify the most appropriate analysis methodologies adjusted to reality. The necessary parameters for analyzing each of the slopes, such as orientation, quantity, spacing, and persistence of the discontinuities, were obtained from the automatic analysis. This type of analysis eliminates the subjectivity of the authors, although the findings are related and resemble those obtained manually. The main contribution of the article consists of the application of fast and low-cost techniques to the evaluation of slopes. It is a type of analysis that is in high demand today in many Andean countries, and this work aims to provide an answer. These methodologies suggested by scientific articles such as this one will later be integrated into some procedures and will be taken into account by technical reports. The results show that with the available information and by applying low-cost techniques, the SMR system is the methodology that presents the best results and adjusts better to the reality of the study area. Therefore, SMR is a necessary parameter to determine rockfall hazards through modified RHRS.<\/jats:p>","DOI":"10.3390\/rs15030862","type":"journal-article","created":{"date-parts":[[2023,2,6]],"date-time":"2023-02-06T05:29:05Z","timestamp":1675661345000},"page":"862","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Stability Analysis of Rocky Slopes on the Cuenca\u2013Gir\u00f3n\u2013Pasaje Road, Combining Limit Equilibrium Methods, Kinematics, Empirical Methods, and Photogrammetry"],"prefix":"10.3390","volume":"15","author":[{"given":"Xavier","family":"Delgado-Reivan","sequence":"first","affiliation":[{"name":"Faculty of Engineering in Earth Sciences (FICT), ESPOL Polytechnic University, Gustavo Galindo Campus Km 30.5 Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador"}]},{"given":"Cristhian","family":"Paredes-Miranda","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences (FICT), ESPOL Polytechnic University, Gustavo Galindo Campus Km 30.5 Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7565-842X","authenticated-orcid":false,"given":"Silvia","family":"Loaiza","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences (FICT), ESPOL Polytechnic University, Gustavo Galindo Campus Km 30.5 Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador"}]},{"given":"Michelle Del Pilar Villalta","family":"Echeverria","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences (FICT), ESPOL Polytechnic University, Gustavo Galindo Campus Km 30.5 Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2089-3980","authenticated-orcid":false,"given":"Maurizio","family":"Mulas","sequence":"additional","affiliation":[{"name":"Faculty of Engineering in Earth Sciences (FICT), ESPOL Polytechnic University, Gustavo Galindo Campus Km 30.5 Perimetral, Guayaquil P.O. Box 09-01-5863, Ecuador"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2332-5647","authenticated-orcid":false,"given":"Luis","family":"Jord\u00e1-Bordehore","sequence":"additional","affiliation":[{"name":"Department of Engineering and Terrain Morphology, Polytechnic University of Madrid, 28040 Madrid, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,3]]},"reference":[{"key":"ref_1","unstructured":"Jorda, L., Tom\u00e1s, R., Rodriguez, M., and Abellan, A. (2016). Manual de Estaciones Geomec\u00e1nicas. Descripci\u00f3n de Macizos Rocosos En Afloramientos, ETSI Minas."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1016\/j.ijrmms.2013.12.020","article-title":"Stability Analysis of Slopes against Combined Circular\u2013Toppling Failure","volume":"67","author":"Mohtarami","year":"2014","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1016\/j.compgeo.2016.07.010","article-title":"System Probabilistic Model of Rock Slope Stability Considering Correlated Failure Modes","volume":"81","author":"Johari","year":"2017","journal-title":"Comput. Geotech."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"104967","DOI":"10.1016\/j.ijrmms.2021.104967","article-title":"Limit Equilibrium Analysis on the Stability of Rock Wedges with Linear and Nonlinear Strength Criteria","volume":"148","author":"Deng","year":"2021","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1249","DOI":"10.1007\/s10064-016-0972-5","article-title":"Bayesian-Based Probabilistic Kinematic Analysis of Discontinuity-Controlled Rock Slope Instabilities","volume":"76","author":"Zhou","year":"2017","journal-title":"Bull. Eng. Geol. Environ."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"167","DOI":"10.28927\/SR.392167","article-title":"Kinematic Assessment of Multi-Face Round Slopes Using Hemispherical Projection Methods (HPM)","volume":"39","year":"2016","journal-title":"Soils Rocks"},{"key":"ref_7","unstructured":"Bar, N., and Barton, N.R. (2016, January 26\u201329). Empirical Slope Design for Hard and Soft Rocks Using Q-Slope. Proceedings of the 50th US Rock Mechanics\/Geomechanics Symposium, Houston, TX, USA."},{"key":"ref_8","unstructured":"Hudson, J.A. (1993). 23\u2014A Geomechanical Classification for Slopes: Slope Mass Rating, Pergamon."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Bastidas, G., Soria, O., Mulas, M., Loaiza, S., and Jord\u00e0-Bordehore, L. (2022). Stability Analysis of Lava Tunnels in Santa Cruz Island (Galapagos Islands, Ecuador) Using Rock Mass Classifications: Empirical Approach and Numerical Modeling. Geosciences, 12.","DOI":"10.3390\/geosciences12100380"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"144","DOI":"10.1017\/CBO9780511740367.014","article-title":"13 Numerical Modeling of Rock-Slope Instability","volume":"13","author":"Stead","year":"2012","journal-title":"Landslides Types Mech. Model."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"989","DOI":"10.1007\/s10064-016-0879-1","article-title":"Numerical Modeling of Discontinuous Rock Slopes Utilizing the 3DDGM (Three-Dimensional Discontinuity Geometrical Modeling) Method","volume":"76","author":"Azarafza","year":"2017","journal-title":"Bull. Eng. Geol. Environ."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"838","DOI":"10.1016\/j.proeng.2017.05.251","article-title":"Identification of Rock Slope Discontinuity Sets from Laser Scanner and Photogrammetric Point Clouds: A Comparative Analysis","volume":"191","author":"Riquelme","year":"2017","journal-title":"Procedia Eng."},{"key":"ref_13","unstructured":"Zhang, L. (2016). Engineering Properties of Rocks, Butterworth-Heinemann."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"300","DOI":"10.1016\/j.geomorph.2012.08.021","article-title":"\u2018Structure-from-Motion\u2019 Photogrammetry: A Low-Cost, Effective Tool for Geoscience Applications","volume":"179","author":"Westoby","year":"2012","journal-title":"Geomorphology"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1016\/j.ijrmms.2018.10.023","article-title":"Towards Automatic Discontinuity Trace Extraction from Rock Mass Point Cloud without Triangulation","volume":"112","author":"Guo","year":"2018","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"105131","DOI":"10.1016\/j.enggeo.2019.05.008","article-title":"Automatic Characterization of Rock Mass Discontinuities Using 3D Point Clouds","volume":"259","author":"Li","year":"2019","journal-title":"Eng. Geol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1016\/j.cageo.2014.03.014","article-title":"A New Approach for Semi-Automatic Rock Mass Joints Recognition from 3D Point Clouds","volume":"68","author":"Riquelme","year":"2014","journal-title":"Comput. Geosci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"165","DOI":"10.1016\/j.ijrmms.2015.12.008","article-title":"Characterization of Rock Slopes through Slope Mass Rating Using 3D Point Clouds","volume":"84","author":"Riquelme","year":"2016","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1016\/j.ijrmms.2012.06.003","article-title":"Automated Mapping of Rock Discontinuities in 3D Lidar and Photogrammetry Models","volume":"54","author":"Lato","year":"2012","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1016\/j.enggeo.2015.06.009","article-title":"Discontinuity Spacing Analysis in Rock Masses Using 3D Point Clouds","volume":"195","author":"Riquelme","year":"2015","journal-title":"Eng. Geol."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"3005","DOI":"10.1007\/s00603-018-1519-9","article-title":"Automatic Mapping of Discontinuity Persistence on Rock Masses Using 3D Point Clouds","volume":"51","author":"Riquelme","year":"2018","journal-title":"Rock Mech. Rock Eng."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1016\/j.ijrmms.2017.06.004","article-title":"Comparing Manual and Remote Sensing Field Discontinuity Collection Used in Kinematic Stability Assessment of Failed Rock Slopes","volume":"97","author":"Bordehore","year":"2017","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"3307","DOI":"10.1007\/s00603-017-1305-0","article-title":"The Q-Slope Method for Rock Slope Engineering","volume":"50","author":"Bar","year":"2017","journal-title":"Rock Mech. Rock Eng."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1823","DOI":"10.5194\/nhess-12-1823-2012","article-title":"Rockfall Hazard and Risk Assessment: An Example from a High Promontory at the Historical Site of Monemvasia, Greece","volume":"12","author":"Saroglou","year":"2012","journal-title":"Nat. Hazards Earth Syst. Sci."},{"key":"ref_25","unstructured":"Barton, N., and Bandis, S. (1990). Review of Predictive Capabilities of JRC-JCS Model in Engineering Practice, Elsevier."},{"key":"ref_26","unstructured":"Avil\u00e9s-Moran, H., Escobar Segovia, K., Flor-Jim\u00e9nez, M., Mulas, M., Murillo-Lozano, I., and Villalta-Echevarr\u00eda, M. (2019, January 24\u201326). Geotechnical and Structural Characterization of the Ignimbritas of the Saraguro Group in the Sector of Santa Isabel-Pucar\u00e1, Ecuador. Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology, Montego Bay, Jamaica."},{"key":"ref_27","unstructured":"Witt, C. (2007). Constraints on the Tectonic Evolution of the North Andean Block Trailing Tail: Evolution of the Gulf of Guayaquil-Tumbes Basin and the Intermontane Basins of the Central Ecuadorian Andes. [Ph.D. Thesis, University of Paris 6]."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/S0012-8252(01)00071-X","article-title":"Neogene Stratigraphy and Andean Geodynamics of Southern Ecuador","volume":"57","author":"Steinmann","year":"2002","journal-title":"Earth-Science Rev."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"e2020TC0066841997","DOI":"10.1029\/2020TC006684","article-title":"Significance of northern Andes terrane extrusion and genesis of the interandean valley: Paleomagnetic evidence from the \u201cEcuadorian orocline\u201d","volume":"40","author":"Siravo","year":"2021","journal-title":"Tectonics"},{"key":"ref_30","unstructured":"Pratt, W.T., Figueroa, J.F., and Flores, B.G. (1997). Geology and Mineralization of the Area between 3\u00b0 and 4\u00b0 S, Western Cordillera, Ecuador, British Geological Survey."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Villalta Echeverria, M.D.P., Vi\u00f1a Ortega, A.G., Larreta, E., Romero Crespo, P., and Mulas, M. (2022). Lineament Extraction from Digital Terrain Derivate Model: A Case Study in the Gir\u00f3n\u2013Santa Isabel Basin, South Ecuador. Remote Sens., 14.","DOI":"10.3390\/rs14215400"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"104729","DOI":"10.1016\/j.ijrmms.2021.104729","article-title":"Development and Application of UAV-SfM Photogrammetry for Quantitative Characterization of Rock Mass Discontinuities","volume":"141","author":"Kong","year":"2021","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1016\/j.jsg.2014.05.014","article-title":"Surveying and Modeling of Rock Discontinuities by Terrestrial Laser Scanning and Photogrammetry: Semi-Automatic Approaches for Linear Outcrop Inspection","volume":"66","author":"Assali","year":"2014","journal-title":"J. Struct. Geol."},{"key":"ref_34","unstructured":"Agisoft, L.L.C. (2014). Agisoft PhotoScan User Manual: Professional Edition, Agisoft LLC."},{"key":"ref_35","unstructured":"Girardeau-Montaut, D. (2016). CloudCompare, Fr. EDF R&D Telecom ParisTech."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"101069","DOI":"10.1016\/j.mex.2020.101069","article-title":"An Empirical Method for Slope Mass Rating-Qslope Correlation for Isfahan Province, Iran","volume":"7","author":"Azarafza","year":"2020","journal-title":"MethodsX"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"600","DOI":"10.1016\/j.jrmge.2015.06.007","article-title":"Slope Mass Rating and Kinematic Analysis of Slopes along the National Highway-58 near Jonk, Rishikesh, India","volume":"7","author":"Siddique","year":"2015","journal-title":"J. Rock Mech. Geotech. Eng."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"315","DOI":"10.1016\/j.ijrmms.2008.06.003","article-title":"Rock Slope Stability Assessment through Rock Mass Classification Systems","volume":"46","author":"Pantelidis","year":"2009","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Selby, M.J. (1980). A Rock Mass Strength Classification for Geomorphic Purposes: With Tests from Antarctica and New Zealand. Z. F\u00fcr Geomorphol., 31\u201351.","DOI":"10.1127\/zfg\/24\/1984\/31"},{"key":"ref_40","unstructured":"Robertson, A.M. (1988, January 25\u201328). Estimating Weak Rock Strength. Proceedings of the SME Annual Meeting, Phoenix, AZ, USA."},{"key":"ref_41","unstructured":"Hack, R. (2002, January 25\u201327). An Evaluation of Slope Stability Classification. Proceedings of the ISRM International Symposium-EUROCK 2002, Madeira, Portugal."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1062","DOI":"10.1016\/j.ijrmms.2007.02.004","article-title":"Modification of Slope Mass Rating (SMR) by Continuous Functions","volume":"44","author":"Delgado","year":"2007","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1144\/GSL.QJEGH.1996.029.P1.03","article-title":"A Comprehensive Method of Rock Mass Characterization for Indicating Natural Slope Instability","volume":"29","author":"Mazzoccola","year":"1996","journal-title":"Q. J. Eng. Geol. Hydrogeol."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"71","DOI":"10.5194\/nhess-4-71-2004","article-title":"Assessment of Rockfall Risk along Roads","volume":"4","author":"Budetta","year":"2004","journal-title":"Nat. Hazards Earth Syst. Sci."},{"key":"ref_45","unstructured":"Pierson, L.A., Davis, S.A., and Van Vickle, R. (1990). Rockfall Hazard Rating System: Implementation Manual, TRB Publications. Report\/Paper Numbers: FHWA-OR-EG-90-01."},{"key":"ref_46","first-page":"11","article-title":"Rockfall Hazard Assessment for Access Road to Dam \u201cSveta Petka\u201d Using Rockfall Hazard Rating System (RHRS)","volume":"25","author":"Jovanovski","year":"2011","journal-title":"Geol. Maced."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/BF01261801","article-title":"The Shear Strength of Rock Joints in Theory and Practice","volume":"10","author":"Barton","year":"1977","journal-title":"Rock Mech."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/3\/862\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T18:23:42Z","timestamp":1760120622000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/3\/862"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,2,3]]},"references-count":47,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2023,2]]}},"alternative-id":["rs15030862"],"URL":"https:\/\/doi.org\/10.3390\/rs15030862","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,2,3]]}}}