Large-scale oblique photography model organization and scheduling method

A technology of oblique photography and scheduling method, applied in the field of geospatial information visualization, can solve the problems of display freeze, redundant loading, heavy loading, etc., to improve efficiency, expand the ability of data loading and visualization, and facilitate rapid data positioning and effective management

Pending Publication Date: 2020-04-10
中国科学院电子学研究所苏州研究院
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Problems solved by technology

This solution improves the loading speed to a certain extent, but there is redundant loading under the GIS platform, which is easy to cause problems such as display freeze and heavy loading

Method used

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  • Large-scale oblique photography model organization and scheduling method
  • Large-scale oblique photography model organization and scheduling method
  • Large-scale oblique photography model organization and scheduling method

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Embodiment

[0040] In order to verify the effectiveness of the solution of the present invention, the following simulation experiments are carried out.

[0041] The specific implementation steps of the organization and scheduling method based on the large-scale oblique photographic model are as follows.

[0042] Input: initial high-precision oblique photographic model data and corresponding geospatial information files. This experiment takes Obj model files, Png and Mtl model material files as examples.

[0043] Step 1: Perform data preprocessing on the initial high-precision oblique photography model according to the following steps:

[0044] Step 1.1: According to the principle that the lower the zoom level, the higher the degree of simplification, the Obj file of the oblique photographic model is simplified and layered in step 1.2.

[0045] Step 1.2: Use the introduced QEM model simplification algorithm to simplify the high-precision oblique photography model. Specify the simplificat...

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Abstract

The invention discloses an organization and scheduling method based on a large-scale oblique photography model, and the method comprises the steps: carrying out the model data hierarchical division ofoblique photography model data, determining the simplified model data and model material files of all hierarchies through combining with the simplification degrees of all hierarchies, and generatingmodel files of different hierarchies; partitioning the model file of each hierarchy to generate partitioned model data of different hierarchies, and recording tiles by adopting OCT coding to generatea Json index file; generating a quadrangular view cone region according to the selected view angle and viewpoint, and calling block model data in the view cone region in combination with the index file; and matching the current view cone area according to the viewpoint and view angle changes, and updating the model data of the corresponding view cone area. According to the method, the data index and the tree-shaped data structure are established after the data is layered and blocked, so that quick positioning and effective management of the data are facilitated; through scheduling strategies of pre-access, three-level caching and the like, the model data loading and rendering efficiency is improved, and the data loading and visualization capacity of the three-dimensional GIS is expanded.

Description

technical field [0001] The invention relates to geographic space information visualization technology, in particular to a method for organizing and scheduling large-scale oblique photographic models. Background technique [0002] Large-scale oblique photographic 3D models can quickly construct and transmit huge ground object information, and are of great value in smart city planning and construction, spatial geographic survey, urban emergency rescue and post-disaster reconstruction. However, the high-precision oblique photography 3D model has extremely high point cloud density and data grid, and the data scale is large, which makes it difficult to load quickly and render smoothly. [0003] At present, the dynamic unitized reconstruction technology is often used to optimize the 3D model of oblique photography, such as "Research on Texture Mapping in 3D Reconstruction of Oblique Photogrammetry" (Yang Zhengyan. Research on Texture Mapping in 3D Reconstruction of Oblique Photogr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/00G06T19/00
CPCG06T15/00G06T19/00
Inventor 曹雪培胡岩峰徐汇军王迪廉海明王毅俞信
Owner 中国科学院电子学研究所苏州研究院
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