Practical application of Hi-Target Mobile Mapping System in Hydrology
 
 
Background 
Guizhou Hydrology and Water Resources Bureau held an emergency preparedness training to ensure effective response to hydro emergencies when needed in Da Caiyuan gauging station in June 20-21, 2017. Hi-Cloud Technology Ltd. was invited to showcase the latest 3D laser system in hydrology applications. We have collected abundant data resulted from the operation and proved that Hi-Target is an advanced technology company in 3D laser system.
 
 
Emergency preparedness training held by Guizhou Hydrology and Water Resources Bureau 
 
 
Hi-Cloud shipborne 3D laser scanning system
 
 
 
Technical staff is using software to process data
 
 
 
Demonstration results 
Generate contours automatically based on point clouds
Since the point cloud data obtained by Hi-Target 3D laser scanning technology has accurate coordinate information, contour lines can be automatically generated from these high-precision point cloud data after custom setting of contour distance in Hi-Target post- processing software. 
 
Hi-Target point cloud processing software support linkage CAD software, into which contours can be imported in real time to draw graph and save image. 
The contours of this demonstration are as follows:
 
 
Generate contours automatically based on point clouds
 
 
 
Contours
 
 
 
Draft Water level lines based on point cloud data
3D laser scanning technology, also known as "real scene copy technology", the point cloud data obtained by 3D laser scanning distinct from traditional survey as high precision, high density. Based on these two characteristic of the point cloud, hand drawing can be proceeded in Hi-Target post-processing software. Hand-drawn water level lines not only suitable for space measurement, also can be displayed as images by linking to real-time  drawing program. 
 
 
 
Water level line drafting based on point cloud data (water level length in real-time display
 
 
 
Contours
 
 
 
Over- and underwater- data integration 
The point cloud obtained by Hi-Target shipborne 3D laser scanner is compatible with the underwater data obtained by the multi-beam echo sounder of  the Guizhou Hydrology Bureau. The auto-generated contour lines and isobaric lines can be imported into the drawing software at the same time, leading to the result of land and underwater data integration. The integration effect is shown as below
 
 
Data integration of land and underwater
 
 
 
Generates contours and depth contours based on land and underwater point cloud data
 
 
Auto area-calculation of liquid surface at any elevation
Generated DEM automatically based on the point cloud, from which to obtain any liquid surface at any elevation.
 
 
Generated DEM automatically based on the point cloud data
 
 
 
Automatic calculation of any liquid surface at any elevation
 
 
Calculate the volume of the reservoir automatically at any elevation
Use Hi-Cloud processing software to generate DEM based on point cloud, from which to obtain the volume at any elevation. 
 
 
Use Hi-Cloud processing software to generate DEM based on point cloud
 
 
 
Obtain the volume according to water lines
 
 
 
Extract arbitrary cross-section lines of river
Because point cloud has high-precision coordinate information, across-section lines can be obtained from cross-section using post-processing software.
 
 
Select cross section in point cloud (red line)
 
 
Extract cross-sectional lines based on cross-sectional point cloud
 
 
 
Visual water lines submergence warning
Equipped with a high-definition panoramic camera, the over- and underwater integrated equipment of Hi-Cloud can capture the real-time view of scenery on both banks of the river. Acquire the predictable elevation of water level through hydrological data and import it into the software to check the forecasting submerged status of water level line in real time.
 
 
360-degree HD panorama image
 
 
 
Forecasting submerged status of water level line (red line)
 
 
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