協振技建　 List of Products and Services

A green laser is a laser that uses "green light." Compared to near-infrared light, it has a stronger wavelength and is not affected by water. When using near-infrared light for UAV surveying, the accuracy of measurements significantly decreases if the road surface is wet due to bad weather, necessitating re-measurement on a different day. Additionally, near-infrared light is absorbed and scattered on water surfaces, making it only possible to measure the ground surface. Our UAV is equipped with a scanner that uses a green laser. By utilizing this, high-precision surveying is possible even on wet road surfaces. Furthermore, in areas where land and water surfaces mix, such as rivers and ports, it is possible to survey down to the riverbed. Please leave the surveying of riverbeds and lakeshores to us! 【Use Cases】 ■ Capable of surveying extensive terrain in a short time over a wide area ■ Due to laser surveying, measurements can be taken even under tree canopies ■ Green lasers allow for the measurement of underwater terrain and bridge bottoms ■ Green lasers enable area-based surveying of riverbeds

The green laser scanner owned by our company has the characteristic of being less absorbed by water by emitting green laser light, unlike the commonly used near-infrared lasers. By mounting this scanner on a UAV and conducting laser measurements, we can obtain seamless and high-precision data down to the riverbed in areas where measuring wet surfaces, as well as places where land and water surfaces mix, such as rivers and ports, was difficult with near-infrared lasers. This case is part of our participation in the environmental restoration activities, including the conservation of saline wetlands in the disaster-affected areas of the Great East Japan Earthquake, conducted by the NPO Mori wa Umi no Koibito. Due to ground subsidence caused by the earthquake, a rare saline wetland has emerged in Japan, where river and sea waters mix. As time passes since the earthquake, while the ecosystem within the wetland is becoming richer, it is expected that the ground will rise due to elastic changes, leading to a decrease in wetland area due to the growth of reeds. Our company has created a high-precision 3D topographic map of the area surrounding the wetland by conducting benchmark surveying and green laser surveying. By continuing measurements, we monitor changes in the surrounding terrain and build a GIS on a 3D model of the rich ecosystem, thereby cooperating in both environmental conservation and disaster recovery efforts.