China Southwest Geotechnical Investigation and Design Institute of China State Construction Engineering Corporation (CSCEC) have gained competitive edges in engineering surveying, geodetic surveying, aerial photography, remoting sensing, geographical information system engineering and real estate surveying. It stands out particularly in land surveying and automatic monitoring of geotechnical engineering for civil airport, rail transit, and freeway projects. In recent years, the institute has completed many surveying projects for rail transits and networks, received more than 30 awards, including the gold award of National Excellent Geodesy Photogrammetry and Cartography Projects and the first prize of CSCEC Excellent Projects.

Capturing data from the air

Since the 2000s, the institute has completed surveying and mapping for more than 10 national hub airport projects and more than 40 national feeder airport projects, accounting for more than 70% of airports in southwestern China. Its leading place in the business has been reinforced by strengths in technologies and innovations.

Airplane-mounted light detection and ranging（LiDAR）system and aerial digital cameras, with integrated technologies of laser, GPS, and inertial navigation system (INS), acquires data and images of the earth surface using laser measurement and photogrammetry methods. It also generates digital elevation model (DEM), digital surface model (DSM), and digital outcrop model (DOM), which can be widely applied to urban 3D modeling, natural disaster evaluations, resources survey, marine monitoring, and large project measurements.

The technologies have been used in projects like Yunnan Nujiang Airport and Guizhou Liping Airport.

Airport clearance surface surveying collects data via satellite and aerial images as well as LiDAR, and generates 3D DSM for obstacles recognition and safety evaluation of an airport’s clearance surface.

The technologies have been used in projects like Chengdu Tianfu International Airport and Chengdu Shuangliu International Airport.

Unmanned Aerial Vehicle (UAV)-based Oblique Photogrammetry exceeds the limits of traditional methods, which capture vertical photographs only. The oblique photogrammetry allows multiple sensors to collect large amount of information from different angles, acquiring 3D data and reflecting accurate ground conditions. The technology has been widely used in projects of large sites like airport construction, to measure terrestrial landscape, generate 3D model and DSM results, calculate earthwork volumes, and provide a reliable database for coordination.

The technologies have been used in projects like Chengdu Tianfu International Airport, Yunnan Nujiang Airport and Huidong Airport.

Technologies for underground surveying  

In the field of underground surveying, the institute has accumulated advanced technologies through purchase, retrofitting, and research and development. It has applied them to a wide range of projects.

The underground surveying system devised for deformation monitoring of airport runways buries a series of advanced sensing equipment, such as single point settlement gauge, hydrostatic level sensor, distributed optical fiber sensors, temperature-compensated fiber, hygrometer, and matric suction meter. The intelligent monitoring system provides real-time reporting of the state of the runways, which has significantly enhanced maintenance and management efficiency and guarded the safety of aircraft movement zone.

The technology has been applied to projects like Chengdu Tianfu International Airport.

Urban Rail Transit Information Platform introduced 3D geological model to support the construction process. It also added the BIM 3D visualization system, so that the measuring points can be marked on the models in an interactive way. Moreover, warnings could be sent out when certain data exceeds the limits.

The technology has been applied to projects like Kunming Changshui International Airport and Guiyang Longdong Airport. 

It built relational database with sophisticate interface to assign labels, sort and filter data, visualize with color schemes, and automatically generate pie charts or bar charts. The front-end supports web release for remote access.

The 3D visualization based on Microsoft PowerBI turns abstract information and data into graphical representation of time-series 3D models, with dynamic demonstration of regional changes over time.

Underground Automatic Monitoring Station collects data of groundwater levels, seepage pressures, and soil displacements via multiple sensors. A connected mobile data recorder allows onsite workers to access and upload data via App, and cross-check with project materials.

The technology has been applied to projects like Chengdu Tianfu International Airport and Shenzhen Metro Line 13. 

China Southwest Geotechnical Investigation and Design Institute has been making headway in InSAR, 5G+ UAV, and 5G+ Intelligent Geotechnical Investigation technologies in order to contribute to CSCEC’s strategic goals of becoming a global top-tier enterprise with strengths on five fronts.

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