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Capturing LiDAR and Imagery Simultaneously: How Major Cities May Benefit from a Hybrid Sensor SystemLemmens, M.J.P.M. (author)People continue to migrate from rural areas to major cities, driving sustained urban growth and increasing the demand for accurate, detailed and up-to-date 3D city models. The creation of such models is still a cumbersome endeavour but new advancements, such as the combination of three sensor types – nadir camera, oblique cameras and a Lidar...journal article 2020
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Lemmens, M.J.P.M. (author)The use of an unmanned aerial system (UAS) – cameras and Lidar sensors mounted on an unmanned aerial vehicle (UAV or ‘drone’) – to acquire geodata for mapping purposes has evolved beyond infancy and is now rapidly maturing. How will UAS mapping evolve in foreseeable future? To envisage where exactly UAS technology is heading, it is appropriate...journal article 2020
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Sajadian, Melika (author), Teixeira, Ana (author), Sadeghi Tehrani, F. (author), Lemmens, M.J.P.M. (author)Built environments developed on compressible soils are susceptible to land deformation. The spatiotemporal monitoring and analysis of these deformations are necessary for sustainable development of cities. Techniques such as Interferometric Synthetic Aperture Radar (InSAR) or predictions based on soil mechanics using in situ characterization,...journal article 2020
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Lepère, Gregory (author), Lemmens, M.J.P.M. (author)Terrestrial laser scanning is becoming an increasingly preferred surveying technique for the 3D documentation of historical buildings. 3D point clouds provide a wealth of information which advanced 3D mapping software can exploit in a relatively simple way, at least when compared to the tedious surveying techniques of the past. However,...journal article 2019
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Lemmens, M.J.P.M. (author)Accurate geoinformation about urban areas, public buildings or historical sites is in great demand. It has become astonishingly easy to capture these scenes through cameras or laser scanning or to acquire open data from a diversity of sources. Professionals without a surveying background can do the job, but such professionals require reliable,...journal article 2019
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Lemmens, M.J.P.M. (author)Did you know that you can waste a week or more per year hunting for a parking space in busy cities? Nowadays, smart parking apps offer a much-needed answer to the problem – and mobile mapping point clouds and imagery are core ingredients of the solution. Besides saving time by guiding you straight to an available spot close to your destination,...journal article 2019
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- Lemmens, M.J.P.M. (author) journal article 2019
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Lemmens, M.J.P.M. (author)The battle against poverty in developing countries has always been associated with the issue of land. Since the turn of the millennium, the focus has been on facilitating the official registration of land rights by the poor and the vulnerable. Many countries in sub-Saharan Africa still lack a well-functioning land administration system,...journal article 2019
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- Lemmens, M.J.P.M. (author) journal article 2019
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Lemmens, M.J.P.M. (author)The ‘smart city’ concept entirely relies on a permanent stream of massive amounts of data acquired by a great variety of sensors distributed throughout the city. Smart use of all this data requires integration with 3D city maps for which point clouds, acquired by laser scanning or photogrammetry, are the main sources. The author<br/>of this...journal article 2018
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Lemmens, M.J.P.M. (author)A knowledge-based system exploits the knowledge, which a human expert uses for completing a complex task, through a database containing decision rules, and an inference engine. Already in the early nineties knowledge-based systems have been proposed for automated image classification. Lack of success faded out initial interest and enthusiasm,...journal article 2018
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Li, Y. (author), Yong, Bin (author), van Oosterom, P.J.M. (author), Lemmens, M.J.P.M. (author), Wu, Huayi (author), Ren, Liliang (author), Zheng, Mingxue (author), Zhou, Jiajun (author)The capability of acquiring accurate and dense three-dimensional geospatial information that covers large survey areas rapidly enables airborne light detection and ranging (LiDAR) has become a powerful technology in numerous fields of geospatial applications and analysis. LiDAR data filtering is the first and essential step for digital elevation...journal article 2017
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Lemmens, M.J.P.M. (author)A total station is an angle measuring device, also known as a theodolite, integrated with an electronic distance measurement (EDM) unit. The integration provides the ability to measure horizontal and vertical angles as well as slope distances using the same device at the same time, which benefits the surveyor in terms of portability, convenience...journal article 2016
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- Lemmens, M.J.P.M. (author) journal article 2015
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- Lemmens, M.J.P.M. (author) journal article 2015
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- Lemmens, M.J.P.M. (author) journal article 2015
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- Lemmens, M.J.P.M. (author) journal article 2015
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- Lemmens, M.J.P.M. (author) journal article 2015
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- Lemmens, M.J.P.M. (author) journal article 2015
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- Lemmens, M.J.P.M. (author) journal article 2015