Chongqing Survey Institute

Chongqing Cybercity Sci-Tech Co., Ltd.

Zejun Xiang

Hanxin Chen

Jing Ming

Chao Li

Yan Zhang

Bo Hu

Hao Tang

Zhi Huang

Changzheng Yuan

Datao Wang

Nan Lv

Zhiyong Zhou

Liangchao Chen

Xuexiang Xiong

Feng Li

Degui Teng

Yonggang Gou

Jiangwei Lin

Xiaolin Hu

Chuan Long

Kaiquan Hu

Hong Ma

Han Chen

Junqian Zhang

Heng Zhang

Zaiqian Luo

Chun Yu

A method for correcting space coordinates of a three-dimensional model includes: step S, reading information of an original coordinate frame of a three-dimensional model in a first format and the origin of coordinates of the model; reading information of nodes from three-dimensional model data in the first format, and calculating original coordinates of the nodes; step S, calculating parameters of correction between the original coordinate frame and a target coordinate frame; step S, transforming and correcting the coordinates of the origin and nodes of the three-dimensional model in the first format one by one by using the space coordinate correction matrix to obtain information of coordinate points of the three-dimensional model in the second format; and step S, storing a file of the three-dimensional model in the second format with corrected space coordinates. Also, a method for encrypting space coordinates of a three-dimensional model is provided.

Methods for correcting and encrypting space coordinates of three-dimensional model

A method for extracting and analyzing spatial information of a control and protection zone of rail transit with multiple threshold constraints, including the following steps: 1, performing format conversion on a data file and extracting a plurality of coordinate points; 2, selecting key points from the plurality of coordinate points for data simplification to obtain a simplified limit line, a simplified outer structure edge line and a simplified boundary line of construction; 3, programming the simplified limit line, the simplified outer structure edge line, and the simplified boundary line of construction, calling a database, and reading data therefrom for spatial relationship comparison; 4, determining whether the construction of a rail-involved construction project intrudes into a control and protection zone of rail transit according to a result of the spatial relationship comparison, thus completing the extraction and analysis of the spatial information of the control and protection zone of rail transit.

Method for extracting and analyzing spatial information of control and protection zone of rail transit with multiple threshold constraints

The present invention provides a point cloud data acquisition method and device under a situation of no GNSS signal. The method comprises: re-sampling line data acquired from a topographic map to obtain discrete line data; generating a full-second PPS pulse in a simulating manner; counting by using a distance measuring instrument, sampling the count, when it is detected that the full-second PPS pulse is received, calculating position information at a current moment; simulating a GNSS satellite protocol according to the position information at the current moment; parsing the GNSS satellite protocol by using a point cloud data acquisition module to complete time synchronization, and controlling a LiDAR to acquire point cloud data; parsing the GNSS satellite protocol by using an inertial measurement module, and recording attitude determination positioning data in real time to generate POS data; and optimizing the POS data to obtain accurate point cloud data.

Point cloud data acquisition method and device under situation of no GNSS signal

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Chongqing, China

Zejun Xiang