Chongqing Survey Institute

Chongqing Cybercity Sci-tech Co., Ltd.

Hanxin Chen

Zejun Xiang

Jing Ming

Chao Li

Bo Hu

Zhi Huang

Degui Teng

Jiangwei Lin

Nan Lv

Xiaolin Hu

Datao Wang

Han Chen

Heng Zhang

Hao Tang

Feng Li

Changzheng Yuan

Yonggang Gou

Chuan Long

Chun Yu

Zaiqian Luo

Xuexiang Xiong

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

Hanxin Chen