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Dem-based Automatic Drawing Method of Terrain Sketch Map

An automatic drawing and sketching technology, applied in 3D modeling, image data processing, instruments, etc., can solve the problem that the terrain expression method cannot be effectively inherited, and achieve the effect of simplifying the drawing technology

Active Publication Date: 2021-05-28
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is a pity that topographical sketching, a concise, general yet profound topographical expression method, has not been effectively passed down.

Method used

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  • Dem-based Automatic Drawing Method of Terrain Sketch Map
  • Dem-based Automatic Drawing Method of Terrain Sketch Map
  • Dem-based Automatic Drawing Method of Terrain Sketch Map

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Embodiment Construction

[0052] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0053] Such as figure 1 As shown, the automatic drawing method of terrain sketch map based on DEM includes the following steps:

[0054] Step 1, obtain the DEM data of the topographic sketch map area to be drawn, and extract the topographic feature line elements in the topographic sketch map area according to the observation point, viewing angle and observation distance requirements of the topographic sketch map; the topographic feature line elements include visual Contour line, along the ditch, cut ditch, frontier edge, slope flow line;

[0055] DEM is the English abbreviation of Digital Elevation Model (Digital Elevation Model), which is an important original data for research and analysis of terrain, watershed, and object recognition. The principle of DEM is to divide the watershed into quadrilaterals (grid, CELL) with m rows and n columns...

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Abstract

The invention discloses a method for automatically drawing terrain sketches based on DEM. The hierarchical dividing line divides the area to be drawn into three areas: near view, middle view, and distant view; 3. Retain all terrain feature line elements in the near view area; only retain the visual contour line in the middle view area; calculate the visual contour lines in the distant view area The area of ​​the closed area formed, select the visual contour lines where the boundaries of the front N closed areas with the largest area are located as the topographic feature line elements reserved in the distant view area; The line features are combined into a topographic sketch map. This method uses DEM to draw terrain sketches, realizes the automatic drawing of sketches, simplifies terrain sketch drawing technology, and can quickly provide terrain sketches that can reflect rich geographical environment and landform structure.

Description

technical field [0001] The invention belongs to the automatic drawing technology of topographic sketch map, in particular to a method for automatically drawing topographic sketch map based on digital elevation model. Background technique [0002] With the rapid development of digital terrain acquisition and modeling technology, the pursuit of quantification and refinement of terrain expression has brought difficulties to terrain cognition. Faced with high-precision and large-scale digital terrain data, most people often fail to grasp the essential characteristics of terrain and landforms. Quantitative indicators based on a large number of terrain analyzes are more abstract and difficult to understand. [0003] Topographical sketching, mainly through the way of sketching, takes the geographical landscape as the object of description, and is used as a scientific method to study and explain the landscape in order to reflect the structure and inner nature of the geographical lan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/05
CPCG06T17/05
Inventor 刘海龙程益涵杨昕代文汤国安
Owner NANJING NORMAL UNIVERSITY
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