No light can replace green light.


Features of Drone Laser Scanner System “TDOT”

TDOT GREEN is a drone-mountable laser scanner system using green light, which is hard to be absorbed by water.
TDOT GREEN delivers 60,000 pulses of laser per second toward the ground.
3D data can be acquired with a simple flight that anyone can do.
3D models of wet ground, riverbeds, and shallow seabed, which were not measured before, can be created.


Scanning the
ground surface under trees

Even in areas covered with trees, 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, it can be used in various fields such as survey, construction,
and research because it can express only the ground surface as if the trees had been cut down.

Green laser not easily absorbed by water

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.


To higher performance
Built-in high-performance INS with further improved measurement accuracy and resolution

INS (inertial navigation system), which determines the accuracy, is further upgraded.
GNSS can receive the position data from satellites only a few to dozens of 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.

Please be sure to feel the performance of TDOT 3 that fully integrates the latest high-performance devices.

Range of 45° right and left from directly below the drone where the accuracy of altitude is stabilized

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

On the other hand, the further away from this range, the more unstable the elevation becomes due to the drone’s attitude.
For surveying with drones, we believe that this is the best choice as the scanning range can be limited to ±45° from directly below, which simplifies the mechanism and reduces the weight of the scanner.

Beam diameter of 1.0mrad suitable for laser surveying

Many inexpensive systems are converted from laser scanners developed to be installed in cars.
However, since the purpose of them is to ensure the detection of nearby obstacles, the beam diameter is wide and the accuracy for the irradiation distance is not important in their design.

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 is a scanner system designed for surveying with drones from scratch.
With a beam diameter of 1.0mrad (10cm spread angle at 100m ahead), the scanner system is suitable for laser surveying that accurately captures the survey target and can pass through gaps in trees easily.


Achieved lighter weight directly related to flight time, safety, and convenience

Drones have a weight limit.
As equipment becomes heavier, the drone to carry it becomes larger and the flight time becomes even shorter, making it more difficult to operate the system.
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 of surveying by flying over a wider area and also greatly reducing the risks associated with flying.

TDOT is a green laser scanner that was considered difficult to reduce in weight, but by applying the best of technology, we have achieved an unparalleled weight reduction.
It weighs only 2.7kg.
Reduced weight to the utmost limit while maintaining strength will improve footwork in operations.


EYE SAFETY to protect eyes

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 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 switches to “Class 3R” when the ground altitude exceeds 40m, which ensures safety.

JIS C 6802 Laser Product Safety Standard

“JIS C 6802” is a translation of the international standard by the Japanese Industrial Standards.

Class 1 Essentially safe.
Class 1M Safe even for long hours of direct observation in the beam with the naked eye. Observation with optical instruments may be hazardous.
Class 2 Low power with visible light (wavelength from 400 to 700nm). Safe in case of instantaneous exposure, but dangerous when intentionally looking into the beam.
Class 2M Low power with visible light (wavelength from 400 to 700nm). Lasers that are safe for short exposures to the naked eye only. Observation with optical instruments may cause eye damage due to exposure.
Class 3R Laser with a relatively low risk of eye injury when viewing in the beam with naked eye.The risk of eye damage increased with exposure time. Intentional exposure to the eye is dangerous.
Class 3B Even short exposures are dangerous if in-beam exposure to the eye occurs.
Class 4 Observations and exposure to skin are dangerous. Laser that can also be dangerous to observe diffuse reflections. There is a risk of fire.

* Class 3R laser equipment can be operated by installing an auto power reduction mechanism to save power in the danger zone.
* For the use of Class 3B and Class 4 laser equipment, a jurisdictional area with no human intrusion is required.


Scan data is displayed in real time

It is now possible to view surveying data during scanning in real time.
Also, the status of scanning under vegetation in areas with many trees, and in water areas, the status of reaching the bottom of the water can be checked during flight.
* For cross-sectional output, an image transmission device and DJI SkyPort that can be connected to HDMI are required on the drone side.

TDOT 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.
The smartphone app was also released.


Automation of analysis processing without requiring expertise

Kinematic analysis process, which used to require expertise, is automated on the cloud.
“POST PROCESSING CLOUD (pay-as-you-go)” that automatically performs optimal trajectory analysis using data from electronic reference points and fixed stations.
“TDOT PROCESSING” for outputting high-precision point group data from data output by optimal trajectory analysis and measurement data.
TDOT, a system that everyone can use.
There is no compromise in the application as well.