Bulletin of Surveying and Mapping ›› 2021, Vol. 0 ›› Issue (8): 48-54.doi: 10.13474/j.cnki.11-2246.2021.0239

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Extraction and analysis of feature elements of micro-topography in southern margin of Dinosaur Valley

LUO Weidong1,2, GAN Shu1,2, YUAN Xiping2,3, GAO Sha1,2   

  1. 1. School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2. Application Engineering Research Center of Spatial Information Surveying and Mapping Technology in Plateau and Mountainous Areas Set by Universities in Yunnan Province, Kunming 650093, China;
    3. School of Earth Sciences and Engineering, West Yunnan University of Applied Sciences, Dali 671006, China
  • Received:2021-01-25 Online:2021-08-25 Published:2021-08-30

Abstract: Topographic feature information is an important basis in geoscience research. It is used to describe the overall appearance of topographic transformation and determines the basic landform and topographic features. This paper qims at the research on the extraction and analysis of topographic features of the annular micro-topography on the southern edge of Lufeng Dinosaur Valley. Firstly, the drone survey technology is used to obtain the image data of the survey area, and the 0.5 m resolution DOM data and point cloud data of the survey area are constructed through image data processing. Based on the Terra solid software platform, the filter rules are built to classify the point cloud data, dilute and compress, extract the ground points in the survey area, and use the ground point data as the basic data to construct DEM data with a resolution of 2 m in the survey area. Then, by superimposing the maximum value extraction and positive and negative terrain extraction in ArcGIS spatial analysis, the extraction and analysis of terrain feature points are completed; combined with the hydrological analysis in ArcGIS and the combination of plane curvature and slope type, the extraction and analysis of terrain feature lines are completed. Finally, an object-oriented method is used by eCognition9.0 to realize the extraction of terrain features. The test results show that: ① The best analysis window for extracting saddle points is 11×11; ② The ridge-valley line is extracted by saddle point positions and two methods. Among them, the hydrological analysis extracts the ridge line that is more detailed and the overall coherence. It is prominent and the saddle points that are extracted from the densely distributed ridges on both sides of the mountain and the rugged mountain in the experimental area. It shows that the southern edge of Dinosaur Valley is affected by the subtropical low-latitude plateau monsoon climate as a whole, and the mountain is weathered and eroded to a certain extent; ③ The topography of the southern edge of Dinosaur Valley among the characteristics, bare rock and bare land account for a relatively large area. Combining the dry and wet climate characteristics of the field and the relatively low vegetation actually is surveyed, which shows to a certain extent that the surface soil in this area is loose, and the attention should be paid to ecological problems caused by soil erosion.

Key words: topographic features, point cloud, real scene construction DEM, DOM, feature analysis

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