A Process-Oriented Method for Rapid Acquisition of Canopy Height Model From RGB Point Cloud in Semiarid Region

Tian, Yu; Bian, Zhengfu; Lei, Shaogang; Ji, Chuning; Zhao, Yibo; Zhang, Shubi; Duan, Lei; Sedlák, Vladimír

doi:10.1109/jstars.2021.3129472

Cited by 4 publications

(1 citation statement)

References 86 publications

(91 reference statements)

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“…Particularly in terrain observation, the advantage of aerial measurement allows experimenters to easily obtain measurement data for complex terrains (such as gullies and mountainous regions), which was previously difficult to achieve. Therefore, extracting ground points from these rich and massive amounts of measurement data has gradually become a difficult and popular topic in research [7,8].…”

Section: Introductionmentioning

confidence: 99%

Multisource elevations strategy obtaining robust seed points and reference surfaces for ground points extraction in complex terrain area

Li,

Wang,

Sun

et al. 2024

Meas. Sci. Technol.

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The appearance of unmanned aerial vehicle photogrammetry and airborne lidar makes it possible to obtain measurement data for complex terrains such as gullies and mountainous regions. However, extracting ground points from these abundant and massive measurement datasets is challenging. In traditional extractions, their essence is to determine the surfaces that can describe the terrain from the seed points in the grid and use them as the basis for separating non-ground points. For effective extraction, this study proposes a multisource elevations strategy (MES) obtaining robust seed points and reference surfaces. First, two-level extended grids were constructed as the basic units. Then, to select more robust values between measurement and interpolation elevations, an elevation-determination rule was established for seed points. After, based fitting and interpolation elevations of grid nodes, the correction range is determined and the elevation is corrected for reference surfaces. In two representative complex terrain areas, when non-ground points were marked as seed points, the MES effectively reduced the phenomenon of seed points moving away from the ground. Reference surfaces can also accurately represent the global change trend and local elevation of the ground in areas where the terrain changes rapidly. This strategy provides a new thinking for ground point extraction from point cloud.

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Section: Introductionmentioning

confidence: 99%