High precision 3D data of structures and terrains is acquired using a terrestrial 3D laser scanner.
It is utilized for surveying the areas of natural disaster, historical site and cultural heritage as it enable us to collect data remotely.
What is Terrestrial Laser Surveying?
Using a ground 3D laser scanner that uses a pulsed laser, we obtain high definition information on the shapes of our survey targets, such as structures and terrain, in the form of point cloud data that is a collection of 3D coordinates. (Operations are carried out from computers that are connected to high-speed scanners.)
The point cloud data acquired is used not only to measure the shapes of the survey targets, but also can be processed in order to create 3D models or 2D ground plans, elevation plans, and vertical cross-sectional diagrams.
PASCO selects the optimal surveying equipment from a variety of measuring equipment, based on the condition of the measurement target and the objectives of the customer. We carry out efficient and appropriate measurement and data acquisition by reviewing and proposing measurement methods that are best suited to the site.
Merits of Terrestrial Laser Surveying
As it is possible to take measurements from a remote location without entering the vicinity of the measurement target, it is possible to obtain 3D data efficiently from a safe place, without having to enter dangerous places (such as the scene of a disaster). It is also possible to survey and obtain 3D data from measurement targets without damaging them. This is particularly relevant to important cultural assets, many of which may not be touched or moved about freely.
■Acquiring Highly Precise Data over a Wide Area in a Short Time
It is possible to acquire highly precise 3D data in a short period of time, using a high-speed laser scanner that covers several thousand points per second.
■Processing the Data Acquired
The 3D data that has been measured can be applied to the measurement of volume, creation of vertical cross-sections at a free location, 3D modeling, etc., depending on the objectives of the customer.
■Overview of Functions
- Surveying range: 2 to 350 m
- Scanning: Vertical direction 80° (1 to 36° scans/second), horizontal direction 340° (1 to 15° scans/second)
- Surveying rate: 28,000 Hz
- Graphic frame rate: May be set freely. Collects 200,000 pixels of 3D data in approximately 20 seconds.
- Surveying precision: Standard ±25 mm (Worst case, ±100 mm); Measurement resolution: 25 mm
Examples of Terrestrial Laser Surveying Applications
- Topographic survey such as roads, parks, bridges, rivers, anti-erosion facilities, tunnels, etc.
- Study of natural disasters (Measurement in dangerous locations such as steep slopes)
- Measurement of buildings and structures
- Complementing airborne laser measurement; verification of precision
- Various forms of displacement measurement
- Production of 3D contents
- Study of heritage sites and cultural assets; digital archives