LiDAR (Light Detection and Ranging) is an optical remote sensing technology which measures properties of scattered light to find range and/or other information of a distant target. Similar to radar technology, which uses radio waves instead of light, LiDAR determines the range to an object by measuring the time delay between transmission of a laser pulse and detection of the reflected signal. Airborne LiDAR surveys are a rapid, highly accurate and efficient method of capturing 3D data of large areas. Bathymetric LiDAR systems are able to detect two returns, delineating both the water surface and seabed. By using an airborne bathymetric sensor, surveys can be completed on shallow waters where boats cannot safely navigate or conduct surveys. LEG operates a Leica AHAB Chiroptera Topographic and Bathymetric LiDAR System.
The Chiroptera II is an innovative LiDAR system which simultaneously captures full waveform LiDAR data from both 35kHz bathymetric and 500kHz topographic channels. The system also includes the Leica RCD30 camera which captures 80 MP RGB + Infrared high resolution aerial photos.The epoch-making Chiroptera II LiDAR system smoothly extend the boundary of traditional airborne survey from land to sea bottom down to 15 meters below the water surface. In addition to a high-accuracy shallow water and coastal zone survey capability, the 500kHz topographic channel, RCD30 camera and PAV100 stabilized mount allow Chiroptera to meet the highest accuracy demands for any topographic survey application. The Chiroptera II provides maximum utility for your investment.
• Seamless land to underwater LiDAR coverage plus high definition camera image
• Extremely high efficiency and accuracy for both land and underwater survey
• The best depth penetration among competing systems
• Oblique scanning LiDAR for optimal performance and enhanced data capture
• Full-waveform capture in both topo and bathy channels
• Tools for land and seabed characterization
• Automatic water refraction correction
Shallow water areas are typically difficult to survey with traditional bathymetric processes. Side scan sonar and Multi-beam require vessels to traverse a project area which makes it difficult to collect in shallow water due to risks to navigation. In order to fully map a region complete coverage must be acquired and this is not possible in the shallow water environment. The Chiroptera II allows for rapid collection, complete coverage and excellent resolutions to meet or exceed required navigation specifications. By deriving the water surface and mapping the bottom simultaneously, extremely accurate depths can be determined.
Rivers and Lakes are typically difficult and time consuming to survey. Traditional survey methods involve extensive ground collection and physical measurements. Large amounts of manpower and field time are required and these methods will only collect transects of a river bottom or lake. These samples allow for interpolation of the bottom and are often only a representation. A LiDAR survey with the Chiroptera II will allow for complete coverage of the waterway with high accuracy and resolution. By deriving the water surface and mapping the bottom simultaneously, extremely accurate depths can be determined.