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No Light Can Replace Green Light

Features of our Laser Scanner System


TDOT GREEN is a drone-mountable laser scanning system which utilises green light. This is ideal for use in marine environments as water is less able to absorb green laser light, as it easily does with red laser light. 

TDOT GREEN delivers 60,000 pulses of laser per second, offering quick collection of 3D data which can be acquired with a simple flight that any pilot can conduct. 3D models of dams, riverbeds, irrigation channels, shallow sea beds and other water bodies which would otherwise be very difficult to capture, can now be easily achievable. While capturing this data through the water, the dry ground and other objects away from the water are conveniently captured within these same scans.

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TDOT 3 GREEN can be used to survey river beds and other shallow water areas. TDOT will also scan the land and ground surfaces around the water.  

This is possible because of the powerful green laser which the TDOT GREEN incorporates.  



Measurement is possible even on the seashore where waves exist. Because of this, 3D mapping of the seafloor topography can be performed close to the shore where it can be difficult for bathy boats to operate.



Construction DX is an innovation that incorporates the latest technologies, including ICT, in surveying, design, construction, and management to improve productivity through work style reforms. TDOT GREEN is essential for the creation of underwater 3D data.



TDOT GREEN is also an effective tool in marine based disaster responses where it can be deployed for rapid visuals investigation. It can acquire necessary data very efficiently. Once processed, the deliverables can be used to visualize the scale and the status of the disaster to best determine next steps. 


Scanning the ground surface under trees

TDOT GREEN measures through the water but also collects the features and grounds around the water. 


Even in tree-covered areas, tens of thousands of beams are emitted per second from low altitudes, increasing the rate of lasers reaching the ground surface through gaps in the branches and leaves.


By using only the data reflected from the ground surface beneath the trees, TDOT GREEN can be used in various fields such as survey, construction and research, as it can express only the ground surface - as if the trees had been cut down.



A typical laser scanner uses a near-infrared laser module with a wavelength of 905nm.
Near-infrared light is easily absorbed by water, and data cannot be obtained by scanning wet objects.
Also, even if you scan a black surface such as asphalt pavement, it is not possible to make measurements because the light reflection is weakened.
TDOT GREEN is equipped with a green laser module with a wavelength of 532nm, which is not easily absorbed by water.
This makes it possible to scan and obtain high-density 3D data on wet, black, and even underwater terrain, which is difficult to do with near-infrared light.

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Built-in high-performance INS further improves measurement accuracy and resolution

GNSS receives the position data from satellites only a few dozen times per second. Therefore, even with a high-performance GNSS receiver, a high-performance INS that calculates gyro and acceleration is essential to obtain a detailed and accurate flight trajectory.

TDOT GREEN fully integrates the latest high-performance components.


Achieve a range of 45° right and left from directly below the drone, where the accuracy of altitude is stabilized

TDOT GREEN is designed specifically for marine surveying. The concept of TDOT GREEN is to acquire the required data efficiently and with high accuracy. TDOT GREEN is designed to intensively scan the ±45° area directly below the drone. Within this range, the accuracy of the altitude value is more stable because it is less affected by the drone’s position.

The TDOT GREEN utilises a dedicated laser sensor with a beam diameter of 1.0mrad (10cm spread angle at 100m ahead), this is more suitable for marine-based surveying. Many inexpensive systems utilise more generic laser sensors, which are challenged to perform in already challenging environments.

Given the challenges of penetrating water and obtaining accurate and detailed results, the quality of the LiDAR system is very important. If the beam diameter is too wide, the areas where the laser beam is irradiating will be vague and the accuracy of the data will be impaired.

TDOT GREEN is a marine scanning system specifically designed for use with drones from scratch. 


Lighter weight relates directly to flight time, safety and convenience

All drones have a weight limit. As equipment becomes heavier, the drone load becomes larger and the flight time becomes even shorter, making it more difficult to operate the system with safety. If the equipment is light and compact, it can be mounted on a small drone and the flight time will be longer, increasing the efficiency by flying over a wider area and also greatly reducing the risks associated with flying.

TDOT GREEN is a green laser scanner that was considered difficult to reduce in weight, but by applying the best technology, we have achieved an unparalleled weight reduction. It now weighs only 2.6kg. We reduced the weight to the utmost limit whilst maintaining strength and safety.


2.6 KG



Eye Safety Protection

International safety standards have been established for laser products to prevent eye injuries. TDOT’s green laser falls under the category of “Class 3R”. To avoid exposure risks, TDOT GREEN is equipped with an eye safety function. The laser power is automatically reduced to “Class 1M” when the altitude is less than 40m above the ground. It then switches to “Class 3R” when the ground altitude exceeds 40m, ensuring safety.

TDOT GREENhas a JIS C 6802 Laser Product Safety Standard - which is a translation of the international standard by the Japanese Industrial Standards.


Scan data is displayed in real-time

It is now possible to view the data in real time during the flight. Also importantly, this includes the success with which the system is penetrating the water and reaching the bottom. Being able to see this during the flight is a great confidence boost with regard to what data is actually being collected. 

TDOT GREEN status is shown on the display

● Number of received satellites
● Satellite quality
● Alignment status
● Scan mode
● Scanning status
● Substrate temperature
● Driver temperature

The status of the above seven items can now be viewed in real-time.

TDOT GREEN includes many innovations designed to make your site-based activities as efficient as possible.



Automation of analysis processing without requiring expertise

TDOT kinematic post processing, which used to require expertise, is now very easy and automated on the cloud. This is a pay-as-you-go system that automatically performs optimal trajectory analysis using data from electronic reference points and fixed stations.


This process utilises “TDOT PROCESSING” for outputting high-precision point clouds from collected TDOT data.


TDOT is a modern and straight forward system that anyone can use. 

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