{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:37:43Z","timestamp":1760240263266,"version":"build-2065373602"},"reference-count":55,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2019,4,19]],"date-time":"2019-04-19T00:00:00Z","timestamp":1555632000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002428","name":"Austrian Science Fund","doi-asserted-by":"publisher","award":["28410-G25"],"award-info":[{"award-number":["28410-G25"]}],"id":[{"id":"10.13039\/501100002428","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Airborne laser scanning (ALS) data can provide more than just a topographic data set for archaeological research. During data collection, laser scanning systems also record radiometric information containing object properties, and thus information about archaeological features. Being aware of the physical model of ALS scanning, the radiometric information can be used to calculate material information of the scanned object. The reflectance of an object or material states the amount of energy it reflects for a specific electromagnetic wavelength. However, the collected radiometric data are affected by several factors that cause dissimilar values to be recorded for the same object. Radiometric calibration of such data minimizes these differences in calculated reflectance values of objects, improving their usability for feature detection and visualization purposes. Previous work dealing with calibration of radiometric data in archaeological research has relied on corresponding in-field measurements to acquire calibration values or has only corrected for a limited number of variables. In this paper, we apply a desk-based approach in which radiometric calibration is conducted through the selection of homogenous areas of interest, without the use of in-field measurements. Together with flight and scan parameters, radiometric calibration allows for the estimation of reflectance values for returns of a single full-waveform ALS data collection flight. The resulting data are then processed into a raster reflectance map that approximates a monochromatic illumination-independent true orthoimage at the wavelength of the laser scanner. We apply this approach to data collected for an archaeological research project in western Sicily and discuss the relative merits of the uses of radiometric data in such locations as well as its wider applicability for present and future archaeological and environmental research. In order to make the approach more accessible, we have developed a freely available tool that allows users to apply the calibration procedure to their own data.<\/jats:p>","DOI":"10.3390\/rs11080945","type":"journal-article","created":{"date-parts":[[2019,4,22]],"date-time":"2019-04-22T03:15:53Z","timestamp":1555902953000},"page":"945","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Relative Radiometric Calibration of Airborne LiDAR Data for Archaeological Applications"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8061-4322","authenticated-orcid":false,"given":"Christopher","family":"Sevara","sequence":"first","affiliation":[{"name":"Department of Prehistoric &amp; Historical Archaeology, University of Vienna, Franz-Klein-Gasse 1-III, 1190 Vienna, Austria"}]},{"given":"Martin","family":"Wieser","sequence":"additional","affiliation":[{"name":"Department of Geodesey and Geoinformation, Research Unit Photogrammetry, Technische Universit\u00e4t Wien, Gusshausstrasse 27-29, 1040 Vienna, Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5091-0094","authenticated-orcid":false,"given":"Michael","family":"Doneus","sequence":"additional","affiliation":[{"name":"Department of Prehistoric &amp; Historical Archaeology, University of Vienna, Franz-Klein-Gasse 1-III, 1190 Vienna, Austria"},{"name":"LBI for Archaeological Prospection and Virtual Archaeology, Hohe Warte 38, 1190 Vienna, Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2348-7929","authenticated-orcid":false,"given":"Norbert","family":"Pfeifer","sequence":"additional","affiliation":[{"name":"Department of Geodesey and Geoinformation, Research Unit Photogrammetry, Technische Universit\u00e4t Wien, Gusshausstrasse 27-29, 1040 Vienna, Austria"}]}],"member":"1968","published-online":{"date-parts":[[2019,4,19]]},"reference":[{"unstructured":"Vosselman, G., and Maas, H.-G. (2010). Laser Scanning Technology. Airborne and Terrestrial Laser Scanning, Whittles Publishing.","key":"ref_1"},{"unstructured":"Briese, C., Pfennigbauer, M., Lehner, H., Ullrich, A., Wagner, W., and Pfeifer, N. (September, January 25). Radiometric Calibration of Multi-Wavelength Airborne Laser Scanning Data. Proceedings of the XXII ISPRS Congress\u2014ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Melbourne, Australia.","key":"ref_2"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"415","DOI":"10.1016\/j.isprsjprs.2007.05.008","article-title":"Correction of laser scanning intensity data: Data and model-driven approaches","volume":"62","author":"Pfeifer","year":"2007","journal-title":"ISPRS J. Photogramm. Remote Sens."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"505","DOI":"10.1016\/j.isprsjprs.2010.06.007","article-title":"Radiometric calibration of small-footprint full-waveform airborne laser scanner measurements: Basic physical concepts","volume":"65","author":"Wagner","year":"2010","journal-title":"ISPRS J. Photogramm. Remote Sens."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"159","DOI":"10.1260\/2047-4970.3.1.159","article-title":"Radiometric Information from Airborne Laser Scanning for Archaeological Prospection","volume":"3","author":"Briese","year":"2014","journal-title":"Int. J. Herit. Digit. Era"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1002\/arp.398","article-title":"Airborne Lidar Intensity and Geoarchaeological Prospection in River Valley Floors","volume":"18","author":"Challis","year":"2011","journal-title":"Archaeol. Prospect."},{"doi-asserted-by":"crossref","unstructured":"Opitz, R., and Cowley, D. (2013). The role of lidar intensity data in interpreting environmental and cultural archaeological landscapes. Interpreting Archaeological Topography. Airborne Laser Scanning, 3D Data and Ground Observation, Oxbow Books.","key":"ref_7","DOI":"10.2307\/j.ctvh1dqdz"},{"doi-asserted-by":"crossref","unstructured":"Campana, S., and Forte, M. (2006). Using airborne LiDAR intensity to predict the organic preservation of waterlogged deposits. From Space to Place: 2nd International Conference on Remote Sensing in Archaeology. Proceedings of the 2nd International Workshop, CNR, Rome, Italy, 4\u20137 December 2006, Archaeopress.","key":"ref_8","DOI":"10.30861\/9781841719986"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1016\/j.jas.2010.09.006","article-title":"Assessing the preservation potential of temperate, lowland alluvial sediments using airborne lidar intensity","volume":"38","author":"Challis","year":"2011","journal-title":"J. Archaeol. Sci."},{"doi-asserted-by":"crossref","unstructured":"Kraus, K. (2007). Photogrammetry: Geometry from Images and Laser Scans, De Gruyter. [2nd ed.].","key":"ref_10","DOI":"10.1515\/9783110892871"},{"unstructured":"Vosselman, G., and Maas, H.-G. (2010). Visualisation and Structuring of Point Clouds. Airborne and Terrestrial Laser Scanning, Whittles Publishing.","key":"ref_11"},{"unstructured":"(2019, April 07). OPALS: Orientation and Processing of Airborne Laser Scanning Data. Available online: https:\/\/opals.geo.tuwien.ac.at\/html\/stable\/index.html.","key":"ref_12"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"372","DOI":"10.1016\/j.rse.2016.08.018","article-title":"Beyond 3-D: The new spectrum of lidar applications for earth and ecological sciences","volume":"186","author":"Eitel","year":"2016","journal-title":"Remote Sens. Environ."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1007\/s10816-011-9104-5","article-title":"Near-Infrared Aerial Crop Mark Archaeology: From its Historical Use to Current Digital Implementations","volume":"19","author":"Verhoeven","year":"2011","journal-title":"J. Archaeol. Method Theory"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"100","DOI":"10.1016\/j.isprsjprs.2005.12.001","article-title":"Gaussian decomposition and calibration of a novel small-footprint full-waveform digitising airborne laser scanner","volume":"60","author":"Wagner","year":"2006","journal-title":"ISPRS J. Photogramm. Remote Sens."},{"unstructured":"Jelalian, A.V. (1992). Laser Radar Systems, Artech House.","key":"ref_16"},{"doi-asserted-by":"crossref","unstructured":"Ikeuchi, K. (2014). Lambertian Reflectance. Computer Vision, Springer.","key":"ref_17","DOI":"10.1007\/978-0-387-31439-6"},{"unstructured":"Lambert, J.H. (1760). Photometria Sive de Mensura de Gratibus Luminis. Colorum et Umbrae. Sumptibus Viduae., E. Klett.","key":"ref_18"},{"unstructured":"Doneus, M., Briese, C., Fera, M., Fornwagner, U., Griebl, M., Janner, M., and Zingerle, M.-C. (2007, January 1\u20136). Documentation and Analysis of Archaeological Sites Using Aerial Reconnaissance and Airborne Laser Scanning. Proceedings of the XXI International CIPA Symposium, Athens, Greece.","key":"ref_19"},{"unstructured":"Wagner, W., and Sz\u00e9kely, B. (2010, January 5\u20137). Analysis of Full-Waveform ALS Data by Simultaneously Acquired TLS Data: Towards an Advanced DTM Generation in Wooded Areas. Proceedings of the ISPRS TC VII Symposium, Vienna, Austria.","key":"ref_20"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"78","DOI":"10.1016\/j.culher.2009.10.004","article-title":"Full-waveform Airborne Laser Scanning for the detection of medieval archaeological microtopographic relief","volume":"10","author":"Lasaponara","year":"2009","journal-title":"J. Cult. Herit."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2061","DOI":"10.1016\/j.jas.2010.10.003","article-title":"Flights into the past: Full-waveform airborne laser scanning data for archaeological investigation","volume":"38","author":"Lasaponara","year":"2011","journal-title":"J. Archaeol. Sci."},{"doi-asserted-by":"crossref","unstructured":"Opitz, R., and Cowley, D.C. (2013). Interpreting Archaeological Topography, Oxbow Books.","key":"ref_23","DOI":"10.2307\/j.ctvh1dqdz"},{"unstructured":"Coren, F., Visintini, D., Prearo, G., and Sterzai, P. (2005, January 17\u201318). Integrating LiDAR intensity measures and hyperspectral data for extracting of cultural heritage. Proceedings of the Italy\u2013Canada 2005 Workshop on 3D Digital Imaging and Modeling: Applications of Heritage, Industry, Medicine and Land, Padova, Italy.","key":"ref_24"},{"unstructured":"Luzum, B., Starek, M., and Slatton, K.C. (2004). 2004 Normalizing ALSM Intensities, Civil and Coastal Engineering Department, University of Florida. Geosensing Engineering and Mapping (GEM) Center Report No. Rep_2004-07-01.","key":"ref_25"},{"doi-asserted-by":"crossref","unstructured":"Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., and Driscoll, R.L. (2017). USGS Spectral Library Version 7: U.S. Geological Survey Data Series 1035.","key":"ref_26","DOI":"10.3133\/ds1035"},{"unstructured":"(2019, February 27). United States Geological Survey Spectral Library Version 7, Available online: https:\/\/speclab.cr.usgs.gov\/spectral-lib.html.","key":"ref_27"},{"unstructured":"(2019, February 27). United States Geological Survey Spectral Library Version 7: Asphalt GDS376 Black_Road Old ASDFRa AREF, Available online: https:\/\/crustal.usgs.gov\/speclab\/data\/GIFplots\/GIFplots_splib07a\/ChapterA_ArtificialMaterials\/splib07a_Asphalt_GDS376_Blck_Road_old_ASDFRa_AREF.gif.","key":"ref_28"},{"unstructured":"(2019, April 07). OPALS: Orientation and Processing of Airborne Laser Scanning Data: Module RadioCal. Available online: https:\/\/opals.geo.tuwien.ac.at\/html\/stable\/ModuleRadioCal.html.","key":"ref_29"},{"unstructured":"(2019, April 07). OPALS: Orientation and Processing of Airborne Laser Scanning Data: Module Cell. Available online: https:\/\/opals.geo.tuwien.ac.at\/html\/stable\/ModuleCell.html.","key":"ref_30"},{"unstructured":"(2019, February 27). The Prospecting Boundaries Project. Available online: http:\/\/mazaro.univie.ac.at.","key":"ref_31"},{"unstructured":"Calafato, B., Tusa, S., and Mammina, G. (2001). Uomo e Ambiente Nella Storia di Mazara del Vallo\u2014Indagine Topografica Nell\u2019agro Mazarese, Grafistampa Palermo.","key":"ref_32"},{"key":"ref_33","first-page":"35","article-title":"Testimonianze archeologiche di et\u00e0 Arcaica e Classica da Mazara del Vallo","volume":"LIII","year":"2016","journal-title":"Kokalos"},{"key":"ref_34","first-page":"75","article-title":"A Sicilian Villa and its Landscape","volume":"5","author":"Fentress","year":"1986","journal-title":"Opus"},{"unstructured":"Leighton, R. (1999). Sicily before History: An Archaeological Survey from the Palaeolithic to the Iron Age, Duckworth.","key":"ref_35"},{"key":"ref_36","first-page":"41","article-title":"Appunti di ricognizioni archeologiche","volume":"4","author":"Mannino","year":"1971","journal-title":"Sicil. Archeol."},{"unstructured":"Tusa, S. (1999). La Sicilia Nella Preistoria, Sellerio Editore. [2nd ed.].","key":"ref_37"},{"unstructured":"Tusa, S. (2005, January 2\u20138). Fenici, Indigeni ed Elimi alla luce delle nuove scoperte. Proceedings of the Atti del V Congresso Internazionale di Studi Fenici e Punici, Marsala, Palermo.","key":"ref_38"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1515\/etst.2010.13.1.49","article-title":"The Marsala Hinterland Survey: Preliminary Report","volume":"13","author":"Blake","year":"2010","journal-title":"Etruscan Stud."},{"unstructured":"van Dommelen, P., and G\u00f3mez Bellard, C. (2008). Sicily and Malta: Between Sea and Countryside. Rural Landscapes of the Punic World, Equinox.","key":"ref_40"},{"doi-asserted-by":"crossref","unstructured":"Jennings, B., Gaffney, C., Sparrow, T., and Gaffney, S. (2017, January 12\u201316). Testing Boundaries: Integrated Prospection from Site to Landscape in Western Sicily. Proceedings of the AP2017: 12th International Conference of Archaeological Prospection, Bradford, UK.","key":"ref_41","DOI":"10.2307\/jj.15135897"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"611","DOI":"10.1007\/s10816-017-9348-9","article-title":"Surfaces from the Visual Past: Recovering High-Resolution Terrain Data from Historic Aerial Imagery for Multitemporal Landscape Analysis","volume":"25","author":"Sevara","year":"2018","journal-title":"J. Archaeol. Method Theory"},{"unstructured":"(2019, February 27). Riegl LMS-Q680i: Long-Range Airborne Laser Scanner for Full Waveform Analysis. Available online: http:\/\/www.riegl.com\/uploads\/tx_pxpriegldownloads\/10_DataSheet_LMS-Q680i_28-09-2012_01.pdf.","key":"ref_43"},{"unstructured":"Terrasolid Ltd. (2019, February 27). Terrascan\u2014Software for LiDAR Data Processing and 3D Vector Data Creation. Available online: http:\/\/www.terrasolid.com\/products\/terrascanpage.php.","key":"ref_44"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"1065","DOI":"10.1017\/S0003598X00097787","article-title":"The cart ruts of Malta: An applied geomorphology approach","volume":"82","author":"Mottershead","year":"2008","journal-title":"Antiquity"},{"unstructured":"Trump, D.H., and Cilia, D. (2008). Cart-Ruts and Their Impact on the Maltese Landscape, Heritage Books.","key":"ref_46"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"279","DOI":"10.4236\/ad.2018.64014","article-title":"Dating the Cart-Ruts of Terceira Island, Azores, Portugal","volume":"6","author":"Rodrigues","year":"2018","journal-title":"Archaeol. Discov."},{"key":"ref_48","first-page":"269","article-title":"Aerial archaeology in the area of Mazara del Vallo, Sicily. Report of the reconnaissance seasons 2003\u20132004","volume":"2","author":"Doneus","year":"2007","journal-title":"Archeol. AereaStudi Di Aerotopografia Aerea"},{"unstructured":"(2019, April 07). University of Vienna Aerial Archive, Resources Page. Available online: https:\/\/luftbildarchiv.univie.ac.at\/resources\/.","key":"ref_49"},{"unstructured":"(2019, April 12). University of Vienna Aerial Archive, Radiometric Calibration of ALS Data. Available online: https:\/\/luftbildarchiv.univie.ac.at\/resources\/software\/radiometric-calibration-of-als-data\/.","key":"ref_50"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1179\/isr.1989.14.1.16","article-title":"The Serendipity Effect of Aerial Reconnaissance","volume":"14","author":"Brugioni","year":"1989","journal-title":"Interdiscip. Sci. Rev."},{"key":"ref_52","first-page":"19","article-title":"Detecting and identifying topographic objects in laser altimeter data","volume":"32","author":"Hug","year":"1997","journal-title":"Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci."},{"unstructured":"Lerma, J.L., and Cabrelles, M. (2016, January 5\u20137). Pixel-level image fusion for archaeological interpretative mapping. Proceedings of the 8th International Congress on Archaeology, Computer Graphics, Cultural Heritage and Innovation, Valencia, Spain.","key":"ref_53"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"283","DOI":"10.1016\/j.inffus.2004.06.004","article-title":"Using the Dempster-Shafer method for the fusion of LIDAR data and multi-spectral images for building detection","volume":"6","author":"Rottensteiner","year":"2005","journal-title":"Inf. Fus."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1002\/arp.1559","article-title":"BRDF and its Impact on Aerial Archaeological Photography","volume":"24","author":"Verhoeven","year":"2017","journal-title":"Archaeol. 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