Method of converting planar model to spherical model

A model and plane technology, applied in the computer field, can solve the problems of complex data conversion and low rendering efficiency of urban models, and achieve the effect of improving reusability and utilization.

Active Publication Date: 2017-06-20
ZHEJIANG KELAN INFORMATION TECH CO LTD
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Problems solved by technology

[0004] Aiming at the disadvantages of complex data conversion and low rendering efficiency in the prior art, the present invention provides a method for converting a plane model to a spherical model. The conversion method mainly includes: obtaining the bottom center point information of the original data and assigning it to the local coordinates System reference information, specify the target spherical coordinate system generated by the conversion, that is, the center point information of the local coordinate system can be projected to the target coordinate system, and the corresponding latitude and longitude values ​​can be obtained

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  • Method of converting planar model to spherical model
  • Method of converting planar model to spherical model
  • Method of converting planar model to spherical model

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Embodiment 1

[0029] A method for converting a plane model to a spherical model, comprising the steps of:

[0030] (1) Obtain the center point information of the original local coordinate system model. Split the model into a single model, calculate the minimum bounding box information of each model according to each singleton model, and obtain the center point information at the bottom of the model through the bounding box information of the model, and these center point information can be exported Save as shp data;

[0031] (2) Center point information is projected to a new longitude-latitude spherical coordinate system. The center point at the bottom of the model is obtained, the coordinate reference is the local coordinate system, and the new spherical coordinate reference information (CGCS2000) is specified, and the coordinate projection transformation is performed to realize the projection of the center point information to the latitude and longitude information;

[0032] The formula...

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Abstract

The invention relates to the technical field of computers, and discloses a method of converting a planar model to a spherical model. The method comprises the following steps: (1) the center point information of an original local coordinate system model is acquired; (2) the center point information is converted to longitude and latitude; (3) according to the longitude and latitude, a corresponding position on a three-dimensional earth model is calculated; (4) the original model is converted to an origin model, and the origin model deflects to the position calculated in the third step; and (5) according to spherical model data obtained in the fourth step, a spherical model is rendered and generated. The reusability of the existing model data is improved; and through the technical scheme of the invention, a result in an urban independent coordinate system can be effectively converted to that in a CGCS2000 coordinate system, the data utilization rate can be effectively improved, and more data can be converted and presented.

Description

technical field [0001] The invention relates to the technical field of computers, in particular to a method for converting a plane model to a spherical model. Background technique [0002] In urban surveying and engineering surveying, if the control network is directly established in the national coordinate system, sometimes the projection of the ground length will be greatly deformed, which is difficult to meet the actual or engineering needs. For this reason, it is often necessary to establish a local coordinate system. In conventional surveying, this local coordinate system is generally only a Gaussian plane coordinate system, and it can also be said to be a ginseng coordinate system different from the national coordinate system. To establish a local coordinate system is to establish some relevant elements of the coordinate system, and to determine the coordinate values ​​of each point in the coordinate system based on these elements and ground observations. [0003] In...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/00
CPCG06T3/005
Inventor 吕健刚俞蔚
Owner ZHEJIANG KELAN INFORMATION TECH CO LTD
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