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Three-dimensional digital city digital elevation model (DEM) processing method in surveying and mapping industry

A technology of three-dimensional numbers and processing methods, applied in the field of geographic information systems, can solve problems such as models and roads that are difficult to coordinate, and achieve the effect of reducing production costs

Inactive Publication Date: 2013-06-12
林善红
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When making based on traditional 3D scenes (that is, based on existing terrain, images, and digital line drawings), it is difficult to coordinate between models, roads, etc. in 3D scenes and terrain due to the influence of DEM grid size and sampling accuracy unanimous

Method used

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  • Three-dimensional digital city digital elevation model (DEM) processing method in surveying and mapping industry

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Embodiment Construction

[0024] see figure 1 , a kind of surveying and mapping industry three-dimensional digital city DEM processing method of the present invention has the following steps:

[0025] 1. Extract residential area elements based on the digital line drawing;

[0026] Residential elements were extracted based on the digital line graph (DLG). (The digital line drawing is the original data provided by Party A, which contains the residential area element data required for model making);

[0027] 2 Based on the ARCGIS tool, the mean value processing of the elevation in the residential area is realized to ensure that the connection between the terrain of the residential area and the surrounding terrain is not abrupt;

[0028] Based on the DEM (Digital Elevation Model) and the extracted residential elements, use the ARCGIS tool to process the mean value of the terrain with the residential element unit as a unit, and assign the obtained mean value to the corresponding residential element unit; ...

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Abstract

The invention relates to a geographic information system, and discloses a three-dimensional digital city digital elevation model (DEM) processing method in surveying and mapping industry. The three-dimensional digital city DEM processing method in the surveying and mapping industry comprises extracting elements of a settlement place based on digital line mapping; achieving mean value processing of an elevation in the settlement place based on an automatic range control geographic information system (ARCGIS); obtaining an elevation value of a side boundary of the settlement place; carrying out further processing on the ARCGIS to ensure non-intersection of road side lines; obtaining contour line data of a certain contour interval from an original DEM according to requirements; removing portions, in a road range and a settlement place range, of the contour line data; carrying out terrain reconstruction on the obtained data, wherein terrain after the terrain reconstruction is a final obtained DEM processing result. The three-dimensional digital city DEM processing method in the surveying and mapping industry effectively uses existing resources, and reduces production cost of a three-dimensional scene.

Description

technical field [0001] The invention relates to a geographic information system, in particular to a method for processing a three-dimensional digital city DEM in the surveying and mapping industry. Background technique [0002] The 3D digital city construction led by the State Bureau of Surveying and Mapping has been carried out in an all-round way across the country. Such a production process has been formed to make full use of existing data and accurately express 3D urban scenes, especially the connection between urban buildings and terrain. [0003] When making based on traditional 3D scenes (that is, based on existing terrain, images, and digital line drawings), it is difficult to coordinate between models, roads, etc. in 3D scenes and terrain due to the influence of DEM grid size and sampling accuracy unanimous. Contents of the invention [0004] The purpose of the present invention is to provide a DEM processing method for three-dimensional digital cities in the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05G06F17/30
Inventor 徐汝坤
Owner 林善红
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