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DEM data denoising method for reserving topographic surface structure features

A technology of surface structure and terrain, applied in image data processing, 3D modeling, image enhancement, etc., can solve the problem of ignoring smooth morphological features

Pending Publication Date: 2021-03-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Application Information

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Problems solved by technology

However, such methods regard the terrain surface as a discrete structure, often ignoring the smooth morphological features between adjacent terrain features

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  • DEM data denoising method for reserving topographic surface structure features
  • DEM data denoising method for reserving topographic surface structure features
  • DEM data denoising method for reserving topographic surface structure features

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with drawings and embodiments.

[0056] (1) main process and working principle of the present invention are:

[0057] 1. Feature point recognition preprocessing:

[0058] Structural features of topographic surfaces are usually located where topographic parameters such as slope and aspect change significantly (i.e., critical elevation points). Therefore, in order to effectively preserve the structural features of the terrain surface, it is very important to realize the extraction of structure points. Use the maximum z-tolerance algorithm to dynamically select key elevation points by using the original elevation of the grid point and the elevation difference estimated by the triangle containing the point.

[0059] The key elevation points are obtained through the original DEM layer and the maximum z limit difference set. First, connect the four corner points of the grid DEM to form an initial triangula...

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Abstract

The invention provides a DEM data denoising method for reserving topographic surface structure features. The method comprises the steps of extracting key elevation points and structure lines of an original topographic curved surface as topographic structure features by utilizing a structure analysis method and obtaining a TIN surface; taking the TIN surface as a guide, and carrying out the smoothing of the DEM data of the original terrain curved surface through employing a guide normal vector filter; and continuing to take the TIN surface as a guide, continuing to adopt a guide normal vector filter to perform filtering and iterative processing on the TIN surface which is subjected to smoothing processing and is obtained in the previous time until DEM data meeting the denoising requirementis obtained. According to the method, the reconstructed terrain surface is used as a guide constraint filtering process, the problem that the structure edge is excessively smooth in traditional filtering is solved, a structure analysis method is introduced to extract key elevation points and boundary lines, and terrain surface structure features can be effectively reserved while DEM data is denoised.

Description

technical field [0001] The invention relates to a DEM data denoising method for retaining topographical surface structure features, and belongs to the technical field of spatial data processing. Background technique [0002] The purpose of processing spatial data is to process the collected original geographic data and the data that do not meet the quality requirements of various spatial analysis techniques, so as to meet the data quality requirements of various geographic information system applications. It is a necessary prerequisite for spatial data analysis to solve the problems of data redundancy, anomaly, and interference, and to create conditions for the effective application of spatial data. As an important part of the natural geographical environment, terrain contains many landform features, which are crucial for many applications such as landscape analysis, hydrological analysis, and urban design. There are two main types of features in natural terrain. One is str...

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Application Information

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IPC IPC(8): G06T5/00G06T5/20G06T17/05
CPCG06T5/20G06T17/05G06T2207/20024G06T5/70
Inventor 禹文豪王管雯张一帆陈占龙
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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