Influence of Gully Sidewall Slope Steepness on the Error of 3D Reconstruction in the Erosion Gully

ZHEN Huaicai; ZHANG Xingyi; YANG Wei; QIAO Baoling; XU Jinzhong; GU Siyu; LI Hao

doi:10.13870/j.cnki.stbcxb.2020.03.010

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Influence of Gully Sidewall Slope Steepness on the Error of 3D Reconstruction in the Erosion Gully

更新时间：2025-03-12

- Influence of Gully Sidewall Slope Steepness on the Error of 3D Reconstruction in the Erosion Gully
- Vol. 34, Issue 3, Pages: 61-66(2020)
- 作者机构：
  
  1. 中国科学院东北地理与农业生态研究所,哈尔滨,150081
  2. 东北农业大学资源与环境学院,哈尔滨,150030
  3. 黑龙江省水利科学研究院,哈尔滨,150081
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.03.010
  CLC： P231;S157
- Published：2020
- 稿件说明：
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ZHEN Huaicai, ZHANG Xingyi, YANG Wei, et al. Influence of Gully Sidewall Slope Steepness on the Error of 3D Reconstruction in the Erosion Gully[J]. 2020, 34(3): 61-66.
DOI：

ZHEN Huaicai, ZHANG Xingyi, YANG Wei, et al. Influence of Gully Sidewall Slope Steepness on the Error of 3D Reconstruction in the Erosion Gully[J]. 2020, 34(3): 61-66. DOI： 10.13870/j.cnki.stbcxb.2020.03.010.

摘要

以无人机为主体的天地一体化立体测量为地表精准快速测量提供了有利条件。无人机拍摄正射影像时，陡坡影响拍摄视角，可能对地表三维测量精度产生影响。选取发展大型切沟（BG）、稳定中型切沟（MG）和小型浅沟（SG），采用三维激光扫描（Terrestrial Laser Scanning，TLS）和无人机正射摄影（Structure from Motion，SfM）2种方法获取地表DSM（Digital Surface Model，数字表面模型），并以TLS的DSM为基准，分析了坡度对SfM的DSM的高程误差的影响。结果表明：（1）高程误差均随沟壁坡度呈指数增加，拟合程度较好（P<0.000 1，R2>0.80），拐点出现在60°附近，坡度<60°时高程误差变化幅度为 0~10 cm，坡度超过60°后高程误差急剧增大为10~60 cm；（2）侵蚀沟愈活跃，其坡比愈大，高程误差占比愈集中在较大坡度的范围内。对于发育中切沟BG，约75%的高程误差量集中在15°~75°；对于趋于稳定的中型切沟MG，约66%的高程误差量集中在0~60°；而对于小型浅沟SG，约54%的高程误差量集中在0~40°。

Abstract

The integrated stereo measurement of the sky and earth with UAV as the main body provides favorable conditions for the accurate and rapid measurement of the earth’s surface.When the UAV takes an orthophoto

the steep slope affects the shooting angle

which may affect the accuracy of the three-dimensional measurement of the surface.In this study

three typical farmland gullies

which were active gully (BG)

stable gully (MG) and ephemeral gully (SG)

were chosen to investigate the effect gully bank slope gradients on SfM-DSM error. The surface DSM (digital surface model) was obtained by using three-dimensional laser scanning (TLS) and structure from motion (SfM) methods. The elevation error of slope to the DSM of SfM was analyzed based on the DSM of TLS. The results show that: (1) The elevation error increased exponentially with the slope of gully wall

and the fitting degree was good (P value was less than 0.000 1

R2 was greater than 0.80). The inflection point appeared near 60°

when the slope was less than 60°

the variation range of elevation error was 0~10 cm

and when the slope was more than 60°

the elevation error increased sharply to 10~60 cm. (2)The more active the gully was

the larger the slope ratio was

and the higher the proportion of elevation error was concentrated in the range of larger slope. For the developing gully of BG

about 75% of the elevation error was concentrated between 15° and 75°.For the stable gully of MG

about 66% of the elevation error was concentrated between 0 and 60°. For the ephemeral gully of SG

about 54% of the elevation error was concentrated between 0 and 40°.

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