Optech SHOALS 机载激光水深测量仪

Optech   LIDAR 应用文献（PDF格式）new

Optech's SHOALS Airborne Laser Bathymeters are a well-proven tool, used for hundreds of surveys in a wide range of applications. Based on the same principle as sonar, but using light instead of sound, SHOALS gather shallow water, shoreline and topographic (ground elevations) data simultaneously, integrating land and water measurements in the same data set. Depth and position measurements are accurate to IHO Order 1. 　

    As well as surveying water depths from the air, and thus avoiding the time and access problems that bedevil other surveying methods, SHOALS can identify underwater objects as small as 2x2x2 metres resting on the ocean floor.

    The SHOALS system combines a powerful, probing laser radar (lidar) and high-speed electronics on an airborne platform. Operating at altitudes of 200-400 metres, with laser spot spacing variable from 2x2 to 5x5 metres, SHOALS has a typical maximum depth penetration of 40-50 m in clear water, 20-40 m in coastal waters, and less than 20 m in more turbid inland waters.

• High area coverage rate: SHOALS scans at aircraft speeds, covering up to 70 km²/hr.
• High accuracy: meets IHO Order 1, position accuracy to within 1.5 m (depending on GPS).
• Fixed-width swaths, independent of water depth, unlike multibeam echo sounders.
• Compact and self-contained; installs into any medium-sized helicopter or fixed-wing aircraft.
• Real-time data display of depth soundings and position.
• Operator control: Airborne operator can change pre-programmed survey parameters on the fly.
• Automated post-flight processing software with sophisticated manual editing tools.

• Cost-effective in shallow water; cCollects dense data sets where acoustic surveying is least efficient.
• Maps extremely shallow water <5 m; no change in vertical accuracy or sounding density.
• Maps land and water in the same mission; simplifies coastal surveys by ensuring continuity through the shoreline in a single survey.
• Maps dangerous areas safely and thoroughly; airborne system immune to grounding hazards, shallows, shoal-infested waters, reefs, rocks, hidden subsurface objects or tidal flows.
• Flexible and rapid deployment; gets in and out quickly to take advantage of periodic and unpredictable access to areas cut off by harsh weather, poor water conditions, or features such as pack ice.
• Prompt damage assessment; maps quickly and thoroughly, generating a large volume of survey data that can be processed to produce damage assessments and dredging estimates, often the same day.
• Detects underwater objects; high-density coverage accurately targets objects as small as 2x2x2 m.
• Easy re-surveying; rapid deployment simplifies re-surveys of dynamic areas, to build up picture of processes over time.