Abstract: A method for correcting space coordinates of a three-dimensional model includes: step S1, 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 S2, calculating parameters of correction between the original coordinate frame and a target coordinate frame; step S3, 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 S4, 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.
Type:
Grant
Filed:
February 4, 2021
Date of Patent:
January 30, 2024
Assignee:
CHONGQING SURVEY INSTITUTE
Inventors:
Zejun Xiang, Zhiyong Zhou, Yan Zhang, Liangchao Chen, Kaiquan Hu, Hong Ma, Junqian Zhang
Abstract: 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.
Type:
Grant
Filed:
December 25, 2017
Date of Patent:
July 12, 2022
Assignees:
CHONGQING SURVEY INSTITUTE, CHONGQING CYBERCITY SCI-TECH CO., LTD.
Inventors:
Hanxin Chen, Zejun Xiang, Chuan Long, Jing Ming, Yonggang Gou, Nan Lv, Han Chen, Zaiqian Luo, Feng Li, Zhi Huang, Xiaolin Hu
Abstract: 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.
Type:
Application
Filed:
February 5, 2021
Publication date:
June 2, 2022
Applicant:
CHONGQING SURVEY INSTITUTE
Inventors:
Hanxin Chen, Xuexiang Xiong, Changzheng Yuan, Degui Teng, Zejun Xiang, Jing Ming, Chun Yu, Chao Li, Heng Zhang, Bo Hu, Datao Wang, Hao Tang, Jiangwei Lin
Abstract: 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.
Type:
Application
Filed:
December 25, 2017
Publication date:
July 22, 2021
Applicants:
CHONGQING SURVEY INSTITUTE, CHONGQING CYBERCITY SCI-TECH CO., LTD.
Inventors:
HANXIN CHEN, ZEJUN XIANG, CHUAN LONG, JING MING, YONGGANG GOU, NAN LV, HAN CHEN, ZAIQIAN LUO, FENG LI, ZHI HUANG, XIAOLIN HU