{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T04:28:16Z","timestamp":1772252896542,"version":"3.50.1"},"reference-count":72,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2020,7,31]],"date-time":"2020-07-31T00:00:00Z","timestamp":1596153600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000923","name":"Australian Research Council","doi-asserted-by":"publisher","award":["LP160100370"],"award-info":[{"award-number":["LP160100370"]}],"id":[{"id":"10.13039\/501100000923","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>In surface mining, rockfall can seriously threaten the safety of personnel located at the base of highwalls and cause serious damage to equipment and machinery. Close-range photogrammetry for the continuous monitoring of rock surfaces represents a valid tool to efficiently assess the potential rockfall hazard and estimate the risk in the affected areas. This work presents an autonomous terrestrial stereo-pair photogrammetric monitoring system developed to observe volumes falling from sub-vertical rock faces located in surface mining environments. The system has the versatility for rapid installation and quick relocation in areas often constrained by accessibility and safety issues and it has the robustness to tolerate the rough environmental conditions typical of mining operations. It allows the collection of synchronised images at different periods with high-sensitivity digital single-lens reflex cameras, producing accurate digital surface models (DSM) of the rock face. Comparisons between successive DSMs can detect detachments and surface movements during defined observation periods. Detailed analysis of the changes in the rock surface, volumes and frequency of the rocks dislodging from the sub-vertical rock surfaces can provide accurate information on event magnitude and return period at very reasonable cost and, therefore, can generate the necessary data for a detailed inventory of the rockfall spatial-temporal occurrence and magnitude. The system was first validated in a trial site, and then applied on a mine site located in NSW (Australia). Results were analysed in terms of multi-temporal data acquired over a period of seven weeks. The excellent detail of the data allowed trends in rockfall event to be correlated to lithology and rainfall events, demonstrating the capability of the system to generate useful data that would otherwise require extended periods of direct observation.<\/jats:p>","DOI":"10.3390\/rs12152459","type":"journal-article","created":{"date-parts":[[2020,8,3]],"date-time":"2020-08-03T06:16:47Z","timestamp":1596435407000},"page":"2459","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Temporal-Spatial Frequency Rockfall Data from Open-Pit Highwalls Using a Low-Cost Monitoring System"],"prefix":"10.3390","volume":"12","author":[{"given":"Anna","family":"Giacomini","sequence":"first","affiliation":[{"name":"Centre for Geotechnical Science and Engineering, University of Newcastle, Callaghan 2308, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7351-7447","authenticated-orcid":false,"given":"Klaus","family":"Thoeni","sequence":"additional","affiliation":[{"name":"Centre for Geotechnical Science and Engineering, University of Newcastle, Callaghan 2308, Australia"}]},{"given":"Marina","family":"Santise","sequence":"additional","affiliation":[{"name":"Centre for Geotechnical Science and Engineering, University of Newcastle, Callaghan 2308, Australia"},{"name":"Department of Engineering and Architecture, University of Parma, 43124 Parma, Italy"}]},{"given":"Fabrizio","family":"Diotri","sequence":"additional","affiliation":[{"name":"Department of Engineering and Architecture, University of Parma, 43124 Parma, Italy"}]},{"given":"Shaun","family":"Booth","sequence":"additional","affiliation":[{"name":"Resources and Infrastructure Development, Glencore, Sydney, NSW 2000, Australia"}]},{"given":"Stephen","family":"Fityus","sequence":"additional","affiliation":[{"name":"Centre for Geotechnical Science and Engineering, University of Newcastle, Callaghan 2308, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7531-638X","authenticated-orcid":false,"given":"Riccardo","family":"Roncella","sequence":"additional","affiliation":[{"name":"Department of Engineering and Architecture, University of Parma, 43124 Parma, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2020,7,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/j.ijrmms.2012.07.030","article-title":"Experimental study on rockfall drapery systems for open pit highwalls","volume":"56","author":"Giacomini","year":"2012","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"2865","DOI":"10.1007\/s00603-016-0918-z","article-title":"Qualitative Rockfall Hazard Assessment: A Comprehensive Review of Current Practices","volume":"49","author":"Ferrari","year":"2016","journal-title":"Rock Mech. Rock Eng."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"697","DOI":"10.1007\/s10346-013-0442-0","article-title":"Spatio-temporal analysis of rockfall pre-failure deformation using Terrestrial LiDAR","volume":"11","author":"Jaboyedoff","year":"2014","journal-title":"Landslides"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2025","DOI":"10.1007\/s10346-017-0834-7","article-title":"Quantifying rock fall probabilities and their temporal distribution associated with weather seasonality","volume":"14","author":"Macciotta","year":"2017","journal-title":"Landslides"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1680\/geot.1962.12.4.251","article-title":"Stability of steep slopes on hard unweathered rock","volume":"12","author":"Terzaghi","year":"1962","journal-title":"Geotechnique"},{"key":"ref_6","unstructured":"Bjerrum, L., J\u00f8rstad, F.A., and J\u00f8rstad, F.A. (1968). Stability of Rock Slopes in Norway, Norges Geotekniske Institute."},{"key":"ref_7","unstructured":"Peckover, F.L. (1972). Treatment of Rock Falls on Railway Lines, American Railway Engineering Association."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1953","DOI":"10.5194\/nhess-14-1953-2014","article-title":"Statistical correlation between meteorological and rockfall databases","volume":"14","author":"Delonca","year":"2014","journal-title":"Nat. Hazards Earth Syst. Sci."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"395","DOI":"10.1038\/ngeo2686","article-title":"Rockfall triggering by cyclic thermal stressing of exfoliation fractures","volume":"9","author":"Collins","year":"2016","journal-title":"Nat. Geosci."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"556","DOI":"10.1680\/jgeen.18.00207","article-title":"Review and latest insights into rock fall temporal variability associated with weather","volume":"172","author":"Macciotta","year":"2019","journal-title":"Proc. Inst. Civ. Eng. Geotech. Eng."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1425","DOI":"10.5194\/nhess-9-1425-2009","article-title":"A nonlinear model coupling rockfall and rainfall intensity based on a four year measurement in a high Alpine rock wall (Reintal, German Alps)","volume":"9","author":"Krautblatter","year":"2009","journal-title":"Nat. Hazards Earth Syst. Sci."},{"key":"ref_12","first-page":"171","article-title":"Quantifying weather conditions for rock fall hazard management","volume":"9","author":"Macciotta","year":"2015","journal-title":"Georisk"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"5","DOI":"10.1007\/s11069-010-9634-2","article-title":"Use of LIDAR in landslide investigations: A review","volume":"61","author":"Jaboyedoff","year":"2012","journal-title":"Nat. Hazards"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"80","DOI":"10.1002\/esp.3493","article-title":"Terrestrial laser scanning of rock slope instabilities","volume":"39","author":"Oppikofer","year":"2014","journal-title":"Earth Surf. Process. Landf."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"9600","DOI":"10.3390\/rs6109600","article-title":"Remote Sensing for Landslide Investigations: An Overview of Recent Achievements and Perspectives","volume":"6","author":"Scaioni","year":"2014","journal-title":"Remote Sens."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"187","DOI":"10.5194\/nhess-4-187-2004","article-title":"Design of a geodetic database and associated tools for monitoring rock-slope movements: The example of the top of Randa rockfall scar","volume":"4","author":"Jaboyedoff","year":"2004","journal-title":"Nat. Hazards Earth Syst. Sci."},{"key":"ref_17","unstructured":"Bertacchini, E., Capra, A., Castagnetti, C., and Corsini, A. (2011, January 18\u201322). Atmospheric corrections for topographic monitoring systems in landslides. Proceedings of the FIG Working Week 2011, Marrakesh, Morocco."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"631","DOI":"10.1007\/s00603-008-0010-4","article-title":"Advanced Geostructural Survey Methods Applied to Rock Mass Characterization","volume":"42","author":"Ferrero","year":"2009","journal-title":"Rock Mech. Rock Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"89","DOI":"10.2113\/gssgfbull.178.2.89","article-title":"Remote-sensing techniques for analysing landslide kinematics: A review","volume":"178","author":"Delacourt","year":"2007","journal-title":"Bull. Soc. Geol. Fr."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"291","DOI":"10.1007\/s10346-010-0215-y","article-title":"Monitoring, prediction, and early warning using ground-based radar interferometry","volume":"7","author":"Casagli","year":"2010","journal-title":"Landslides"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/j.isprsjprs.2012.03.007","article-title":"Correlation of multi-temporal ground-based optical images for landslide monitoring: Application, potential and limitations","volume":"70","author":"Travelletti","year":"2012","journal-title":"ISPRS J. Photogramm. Remote Sens."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1186\/s40677-017-0073-1","article-title":"Spaceborne, UAV and ground-based remote sensing techniques for landslide mapping, monitoring and early warning","volume":"4","author":"Casagli","year":"2017","journal-title":"Geoenviron. Disasters"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"2659","DOI":"10.5194\/nhess-13-2659-2013","article-title":"Experiences from site-specific landslide early warning systems","volume":"13","author":"Michoud","year":"2013","journal-title":"Nat. Hazards Earth Syst. Sci."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"223","DOI":"10.1007\/978-3-319-09060-3_36","article-title":"LiDAR and discrete fracture network modeling for rockslide characterization and analysis","volume":"Volume 6","author":"Sturzenegger","year":"2015","journal-title":"Engineering Geology for Society and Territory"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Sharon, R., and Eberhardt, E. (2020). Guidelines for Slope Performance Monitoring, CSIRO Publishing.","DOI":"10.1071\/9781486311002"},{"key":"ref_26","unstructured":"Farina, P., Leoni, L., Babboni, F., Coppi, F., Mayer, L., and Ricci, P. (2011, January 18\u201321). IBIS-M, an Innovative Radar for Monitoring Slopes in Open-Pit Mines. Proceedings of the Interrnational Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering, Vancouver, BC, Canada."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"202","DOI":"10.1016\/j.enggeo.2014.07.016","article-title":"Development and application of a pseudo-3D pit slope displacement map derived from ground-based radar","volume":"181","author":"Severin","year":"2014","journal-title":"Eng. Geol."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1016\/j.geomorph.2010.03.016","article-title":"Detection and spatial prediction of rockfalls by means of terrestrial laser scanner monitoring","volume":"119","author":"Calvet","year":"2010","journal-title":"Geomorphology"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"457","DOI":"10.1016\/j.geomorph.2010.10.009","article-title":"Rock cliffs hazard analysis based on remote geostructural surveys: The Campione del Garda case study (Lake Garda, Northern Italy)","volume":"125","author":"Ferrero","year":"2011","journal-title":"Geomorphology"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1579","DOI":"10.1007\/s10346-017-0801-3","article-title":"Effects of sampling interval on the frequency\u2014magnitude relationship of rockfalls detected from terrestrial laser scanning using semi-automated methods","volume":"14","author":"Hutchinson","year":"2017","journal-title":"Landslides"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"194","DOI":"10.1016\/j.ijrmms.2008.04.007","article-title":"Optimization of LiDAR scanning and processing for automated structural evaluation of discontinuities in rockmasses","volume":"46","author":"Lato","year":"2009","journal-title":"Int. J. Rock Mech. Min. Sci."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2010JF001807","article-title":"Detailed DEM analysis of a rockslide scar to characterize the basal sliding surface of active rockslides","volume":"116","author":"Oppikofer","year":"2011","journal-title":"J. Geophys. Res. Earth Surf."},{"key":"ref_33","unstructured":"Klappstein, B., Bonci, G.M.W., and Maston, W. (2014, January 10\u201311). Implementation of Real Time Geotechnical Monitoring at an Open Pit Mountain Coal Mine, Western Canada. Proceedings of the International Multidisciplinary Symposium UNIVERSITARIA SIMPRO, Petrosani, Romania."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Kromer, R.A., Abellan, A., Hutchinson, D.J., Lato, M., Chanut, M.-A., Dubois, L., and Jaboyedoff, M. (2017). Automated Terrestrial Laser Scanning with Near Real-Time Change Detection\u2014Monitoring of the S\u00e9chilienne Landslide. Earth Surf. Dyn. Discuss., 1\u201333.","DOI":"10.5194\/esurf-2017-6"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"847","DOI":"10.1007\/s10346-017-0921-9","article-title":"Rockfall risk management using a pre-failure deformation database","volume":"15","author":"Kromer","year":"2018","journal-title":"Landslides"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"101","DOI":"10.5194\/esurf-6-101-2018","article-title":"Optimising 4-D surface change detection: An approach for capturing rockfall magnitude-frequency","volume":"6","author":"Williams","year":"2018","journal-title":"Earth Surf. Dyn."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/S0013-7952(02)00201-6","article-title":"Seventeen years of the \u201cLa Clapi\u00e8re\u201d landslide evolution analysed from ortho-rectified aerial photographs","volume":"68","author":"Casson","year":"2003","journal-title":"Eng. Geol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"875","DOI":"10.5194\/isprs-archives-XLI-B5-875-2016","article-title":"Close range digital photogrammetry applied to topography and landslide measurements","volume":"41","author":"Liu","year":"2016","journal-title":"Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci.\u2014ISPRS Arch."},{"key":"ref_39","first-page":"101","article-title":"Use of low-cost terrestrial and aerial imaging sensors for geotechnical applications","volume":"53","author":"Thoeni","year":"2018","journal-title":"Aust. Geomech. J."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1016\/j.enggeo.2009.03.004","article-title":"Close-range terrestrial digital photogrammetry and terrestrial laser scanning for discontinuity characterization on rock cuts","volume":"106","author":"Sturzenegger","year":"2009","journal-title":"Eng. Geol."},{"key":"ref_41","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_42","unstructured":"Thoeni, K., Irschara, A., and Giacomini, A. (September, January 25). Efficient photogrammetric reconstruction of highwalls in open pit coal mines. Proceedings of the 16th Australasian Remote Sensing and Photogrammetry Conference Proceedings, Melbourne, Australia."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"76","DOI":"10.15273\/ijge.2015.02.009","article-title":"Review of Photogrammetry-Based Techniques for Characterization and Hazard Assessment of Rock Faces","volume":"1","author":"Tannant","year":"2015","journal-title":"Int. J. Geohazards Environ."},{"key":"ref_44","unstructured":"Travelletti, J., Malet, J.-P., Schmittbuhl, J., Toussaint, R., and Bastard, M. (2010, January 24\u201326). Multi-temporal terrestrial photogrammetry for landslide monitoring. Proceedings of the Mountain Risks International Conference, Firenze, Italy."},{"key":"ref_45","first-page":"73","article-title":"Landslide Displacement Monitoring from Multi-Temporal Terrestrial Digital Images: Case of the Valoria Landslide Site","volume":"Volume 2","author":"Margottini","year":"2013","journal-title":"Landslide Science and Practice"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"297","DOI":"10.5194\/isprsannals-II-5-297-2014","article-title":"Landslide monitoring by fixed-base terrestrial stereo-photogrammetry","volume":"2","author":"Roncella","year":"2014","journal-title":"ISPRS Ann. Photogramm. Remote Sens. Spat. Inf. Sci."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"1413","DOI":"10.1002\/esp.3609","article-title":"Mitigating systematic error in topographic models derived from UAV and ground-based image networks","volume":"39","author":"James","year":"2014","journal-title":"Earth Surf. Process. Landforms"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"359","DOI":"10.5194\/esurf-4-359-2016","article-title":"Image-based surface reconstruction in geomorphometry-merits, limits and developments","volume":"4","author":"Eltner","year":"2016","journal-title":"Earth Surf. Dyn."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"937","DOI":"10.1017\/jog.2017.48","article-title":"An integrated Structure-from-Motion and time-lapse technique for quantifying ice-margin dynamics","volume":"63","author":"Mallalieu","year":"2017","journal-title":"J. Glaciol."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"408","DOI":"10.1111\/phor.12288","article-title":"Optimising the quality of an SfM-MVS slope monitoring system using fixed cameras","volume":"34","author":"Parente","year":"2019","journal-title":"Photogramm. Rec."},{"key":"ref_51","doi-asserted-by":"crossref","unstructured":"Kromer, R., Walton, G., Gray, B., Lato, M., and Group, R. (2019). Development and optimization of an automated fixed-location time lapse photogrammetric rock slope monitoring system. Remote Sens., 11.","DOI":"10.3390\/rs11161890"},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Blanch, X., Abellan, A., and Guinau, M. (2020). Point Cloud Stacking: A Workflow to Enhance 3D Monitoring Capabilities Using Time-Lapse Cameras. Remote Sens., 12.","DOI":"10.3390\/rs12081240"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"1015","DOI":"10.5194\/isprs-archives-XLII-2-1015-2018","article-title":"Analysis of low-light and night-time stereo-pair images for photogrammetric reconstruction","volume":"42","author":"Santise","year":"2018","journal-title":"Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci.\u2014ISPRS Arch."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"909","DOI":"10.5194\/isprs-archives-XLI-B5-909-2016","article-title":"The potential of low-cost RPAs for multi-view reconstruction of sub-vertical rock faces","volume":"XLI-B5","author":"Thoeni","year":"2016","journal-title":"ISPRS\u2014Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci."},{"key":"ref_55","first-page":"855","article-title":"Close-Range Camera Calibration","volume":"37","author":"Brown","year":"1971","journal-title":"Photogramm. Eng. Remote Sensing"},{"key":"ref_56","unstructured":"Forlani, G., and Pinto, L. (2007, January 29\u201331). GPS-assisted adjustment of terrestrial blocks. Proceedings of the 5th International Symposium on Mobile Mapping Technology, Padua, Italy."},{"key":"ref_57","doi-asserted-by":"crossref","unstructured":"Roncella, R., and Forlani, G. (2015). A fixed terrestrial photogrammetric system for landslide monitoring. Modern Technologies for Landslide Monitoring and Prediction, Springer.","DOI":"10.1007\/978-3-662-45931-7_3"},{"key":"ref_58","unstructured":"Lucas, B.D., and Kanade, T. (1981, January 24\u201328). An Iterative Image Registration Technique with an Application to Stereo Vision. Proceedings of the 7th International Joint Conference on Artificial Intelligence, San Francisco, CA, USA."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"7985","DOI":"10.3390\/s150407985","article-title":"Network Design and Quality Checks in Automatic Orientation of Close-Range Photogrammetric Blocks","volume":"15","author":"Thoeni","year":"2015","journal-title":"Sensors"},{"key":"ref_60","unstructured":"(2020, June 01). Agisoft Methashape 2020. Available online: https:\/\/www.agisoft.com\/."},{"key":"ref_61","unstructured":"(2020, June 01). CloudCompare (Version 2.10.2) (GPL Software) 2020. Available online: https:\/\/www.danielgm.net\/cc\/."},{"key":"ref_62","unstructured":"Kraus, K., Harley, I.A., and Kyle, S. (2011). Photogrammetry, De Gruyter."},{"key":"ref_63","first-page":"125","article-title":"Close-Range Photogrammetry and 3d Imaging","volume":"Volume 29","author":"Luhmann","year":"2014","journal-title":"The Photogrammetric Record"},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"2745","DOI":"10.5194\/nhess-19-2745-2019","article-title":"Three-dimensional rockfall shape back analysis: Methods and implications","volume":"19","author":"Bonneau","year":"2019","journal-title":"Nat. Hazards Earth Syst. Sci."},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"114","DOI":"10.1086\/626490","article-title":"Pebbles in the Lower Colorado River, Texas a Study in Particle Morphogenesis","volume":"66","author":"Sneed","year":"1958","journal-title":"J. Geol."},{"key":"ref_66","unstructured":"H\u00f6hle, J., and Potuckova, M. (2011). Assessment of the Quality of Digital Terrain Medels, European Spatial Data Research. No. 60."},{"key":"ref_67","unstructured":"Diessel, C. (1983, January 12\u201317). Tuffs and Tonsteins in the Coal Measures of New South Wales, Australia. Proceedings of the Dixieme Congres International de Stratigraphie et de Geologie du Carbonifere, Madrid, Spain."},{"key":"ref_68","unstructured":"Seedsman, R. (1989). Claystones of the Newcastle Coal Measures, NERDDC. NERDDC Project C0902."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1016\/j.enggeo.2013.03.016","article-title":"Investigating statistical relationships among clay mineralogy, index engineering properties, and shear strength parameters of mudrocks","volume":"159","author":"Hajdarwish","year":"2013","journal-title":"Eng. Geol."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1016\/j.enggeo.2008.12.013","article-title":"Assessment of physical disintegration characteristics of clay-bearing rocks: Disintegration index test and a new durability classification chart","volume":"105","author":"Erguler","year":"2009","journal-title":"Eng. Geol."},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1016\/0148-9062(76)90705-1","article-title":"The mechanisms of strength reduction due to moisture in coal mine shales","volume":"13","year":"1976","journal-title":"Int. J. Rock Mech. Min. Sci. Geomech."},{"key":"ref_72","unstructured":"Molinda, G.M., Oyler, D.C., and Gurgenli, H. (2006, January 1\u20133). Identifying moisture sensitive roof rocks in coal mines. Proceedings of the 25th International Conference Ground Control Mining, Morgantown, WY, USA."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/15\/2459\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:53:18Z","timestamp":1760176398000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/15\/2459"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,7,31]]},"references-count":72,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2020,8]]}},"alternative-id":["rs12152459"],"URL":"https:\/\/doi.org\/10.3390\/rs12152459","relation":{"is-referenced-by":[{"id-type":"doi","id":"10.1007\/s12518-025-00643-5","asserted-by":"object"}]},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,7,31]]}}}