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Three-dimensional model coordinate conversion method based on Brep model

A technology of coordinate transformation and three-dimensional model, applied in the computer field, can solve the problems of poor fit of data and real coordinate data model, poor generality of three-dimensional model data, damage to the integrity of three-dimensional model, etc. The effect of good compatibility and high conversion efficiency

Pending Publication Date: 2019-08-09
浙江省第一测绘院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The fit between the converted data and the real coordinate data model is not good;
[0005] (2) After the conversion, the integrity of the 3D model is destroyed, and there are p

Method used

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  • Three-dimensional model coordinate conversion method based on Brep model
  • Three-dimensional model coordinate conversion method based on Brep model
  • Three-dimensional model coordinate conversion method based on Brep model

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0043] Example 1

[0044] The transformation of Jiashan's oblique 3D local coordinates and CGCS2000 coordinates: The data is oblique photogrammetry data, and the goal is to convert oblique photogrammetry data to the local coordinate system. This method is used for the conversion work.

[0045] S1: Analyze the oblique photogrammetry data based on the Brep structure, using points, lines, and planes as basic geometric elements to describe the relationship between three-dimensional entities. Using graphics-based boundary representation model, with elements, point sets, and textures as the core, points, lines, and surfaces as basic geometric elements, the relationship between 3D entities is described, and the 3D spatial data set is organized in a hierarchical tree structure, and The three-dimensional spatial data set is divided into root nodes, branch nodes, and leaf nodes. In view of the complex 3D model data structure, no geometric modeling features, and high computational complexity...

Example Embodiment

[0065] Example 2

[0066] The local coordinates of the Wenling 3D building model are converted to Taizhou 2000 coordinates: the data is artificial 3D model data, and the goal is to convert the artificial 3D model data to the local coordinate system. The conversion work is carried out through this method.

[0067] S1: Analyze the artificial 3D model data based on the Brep structure, using points, lines, and surfaces as basic geometric elements to describe the relationship between 3D entities. Using graphics-based boundary representation model, with elements, point sets, and textures as the core, points, lines, and surfaces as basic geometric elements, the relationship between 3D entities is described, and the 3D spatial data set is organized in a hierarchical tree structure, and The three-dimensional spatial data set is divided into root nodes, branch nodes, and leaf nodes. In view of the complex 3D model data structure, no geometric modeling features, and high computational comple...

Example Embodiment

[0081] Example 3

[0082] Conversion from Xiaoshan local coordinate system to CGCS2000: According to the oblique photogrammetric data, the goal is to convert the oblique photogrammetric data to the CGCS2000 coordinate system, and the conversion work is carried out by this method.

[0083] S1: Analyze the oblique photogrammetry data based on the Brep structure, using points, lines, and surfaces as basic geometric elements to describe the relationship between three-dimensional entities. Using the graphics-based boundary representation model, with elements, point sets, and textures as the core, points, lines, and surfaces as basic geometric elements, the relationship between three-dimensional entities is described, and three-dimensional spatial data sets are organized in a hierarchical tree structure, and The three-dimensional spatial data set is divided into root nodes, branch nodes, and leaf nodes. In view of the complex 3D model data structure, no geometric modeling features, high...

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Abstract

The invention discloses a three-dimensional model coordinate conversion method based on Brep model, which comprises the following steps of: S1, carrying out data analysis on acquired data to obtain athree-dimensional space data set; and S2, carrying out coordinate conversion on the three-dimensional space data set obtained through analysis, solving a conversion parameter according to an overall least square estimation criterion, considering the situation that the coefficient matrix and the observation value matrix have accidental errors at the same time, and correcting the coefficient matrixand the observation value matrix at the same time; and S3, outputting the three-dimensional model data after coordinate conversion. The nesting condition of the model subjected to three-dimensional model coordinate conversion and two-dimensional data is good, the integrity of the model is good, and consistency is kept before and after conversion; and moreover, the conversion efficiency is high, the data access and processing efficiency is high, about 0.3 second is taken for two thousands of surfaces, and in addition, the possible phenomena of surface leakage, stretching and the like are eradicated.

Description

technical field [0001] The invention belongs to the technical field of computers, and in particular relates to a three-dimensional model coordinate conversion method based on a Brep model. Background technique [0002] The digital terrain model (Digital Terrain Model, DTM, referred to as digital model) refers to the digital representation of various information such as terrain surface morphology. It is a data group organized according to a certain structure. A description of the number of attribute characteristics. Three-dimensional digital model is to construct a three-dimensional digital model that can be used for design and subsequent processing from the shape expressed by engineering or product design plan, front drawing (original drawing), sketch, technical description and other technical drawings. [0003] In applications such as geodetic surveying, photogrammetry, and engineering surveying, coordinate conversion, 3D model coordinate conversion such as oblique photogr...

Claims

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Application Information

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IPC IPC(8): G06T3/00G06T17/00
CPCG06T3/0037G06T17/00
Inventor 钱荣荣蔡志刚胡传文骆骐江华张畅朱骏侠龙容
Owner 浙江省第一测绘院
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