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A voxel-based fine-scale 3d landscape pattern analysis using laser scanner point clouds

Global Geology 2021年第3期24卷 177-182页

作者： SUN Hongzhan WU Qiong College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China

The landscape pattern metrics can quantitatively describe the characteristics of landscape pattern and are widely used in various fields of landscape ecology.due to the lack of vertical information,2d landscape metrics cannot delineate the vertical characteristics of landscape pattern.Based on the point clouds,a high-resolution voxel model and several voxel-based 3d landscape metrics were constructed in this study and 3d metrics calculation results were compared with that of 2d metrics.The results showed that certain quantifying difference exists between 2d and 3d landscape metrics.For landscapes with different components and spatial configurations,significant difference was disclosed between 2d and 3d landscape metrics.3d metrics can better reflect the real spatial structure characteristics of the landscape than 2d metrics.

关键词： 3d landscape metrics 3d laser scanner voxel point clouds

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Morphologic changes of simple star dunes during the growth process in dunhuang,China

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Journal of Mountain Science 2022年第4期19卷 1095-1106页

作者： AN Zhi-shan ZHANG Ke-cun TAN Li-hai NIU Qing-he LIU Ben-li NIU Bai-cheng dunhuang Gobi and desert Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of desert and desertification Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Star dune is one typical kind of aeolian geomorphology in global sand seas.It has attracted scholars in various research fields for years because of its unique morphologic features like Egyptian pyramid.The landform pattern of star dune is mainly dominated by factors such as regional wind regime,sand availability,and local topography.Star dunes grow vertically as they accumulate sand brought in from different directions;however,little is known regarding morphologic changes during this process.The stability of star dunes based on quantitative data is another unsolved question due to the limitation in measuring equipment or other factors.And whether the star dune can grow into star sand hills is another scientific problem which needs to be discussed.In this paper,the heightening development process and morphological changes of star dunes were monitored in Mingsha Mountain of dunhuang with the 3d laser scanner.Results show that the star dunes in Mingsha Mountain were formed by a group of relatively steady winds,which were northwest,northeast and south winds.With the increase of the height of the star dunes,the morphological parameters of the dune,such as the volume and bottom area,did not show regular changes.The surface erosion of both dune 1 and dune 2 during the observation period was closely related to the regional wind conditions.during the growth of the star dunes,the overall trend of the dunes was relatively steady and the dune shape maintained its stability although the aspect and slope of the sand dunes changed,indicating that the stability of star dune was not complete and was dynamic.Moreover,the variation range of the dune slope was proportional to the volume change of the dune.

关键词： Star dune 3d laser scanner dunhuang Morphologic change

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维普期刊数据库

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The first scientific plan of the MosqueCathedral of Cordoba:Graphic and dimensional analysis of an oil painting from 1741

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Frontiers of Architectural Research 2023年第4期12卷 587-600页

作者： Juan Cantizani-Oliva Juan-Francisco Reinoso-Gordo Antonio Gamiz-Gordo Electrical and Automatic Engineering department University of CordobaCordoba 14071Spain Architectural and Engineering Graphic Expression department University of GranadaGranada 18071Spain Architectural Graphic Expression department University of SevilleSeville 41012Spain

This research analyzes the earliest located floor plan of the Mosque-Cathedral of Cordoba,an anonymous oil painting in 1741,which has not been studied so far.The objective is to know the dimensional accuracy of the most relevant architectural forms drawn,considering the elements referenced in their legend and the graphic symbols used,to assess their documentary interest.It has also been compared with two important plans of the MosqueCathedral drawn in 1767 and 1868.The first task was a photogrammetric survey of the oil painting has been carried out.Subsequently,some data has been measured in the monument using a 3d scanner.The orthophoto of the oil painting has been overlapped to the digital model to verify its metric accuracy in a selection of points.For the first time,the legend and labels included in the oil painting have been transcribed.This precise graphic document contains reliable abundant data for future research about the transformations and restorations of a monument that is part of the UNESCO World Heritage List.The oil painting dating from 1741 can be considered as the first scientific plan of the Mosque-Cathedral of Cordoba,and as an outstanding architectural survey of eighteenth-century Europe.

关键词： Mosque-Cathedral Co´rdoba Historical plans Photogrammetry 3d laser scanner

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