Best Practices and Inspiring Bathymetric Lidar Projects - 26/06/2018


Bathymetric Lidar is a technique to capture geospatial data of coastlines and (shallow) waters. The method has the potential to facilitate the fast and efficient creation of hydrographic data. More and more users are turning to it to support many new and different applications. At 'Hydro International' we have selected a series of articles on this technique, ranging from case studies that zoom in on some challenging projects using bathymetric Lidar in combination with other survey methodologies, to in-depth articles focusing on the latest trends and developments relating to this hydrographic surveying technology.

Acoustically Aided INS and Lidar

Aerial mobile mapping using Lidar and GNSS-aided inertial navigation has revolutionised the efficiency of land and shallow-water bathymetric surveying. Now, fast ultra-high-resolution subsea mobile mapping is approaching. Millimetre resolution Lidar sensors have emerged in parallel with major advances in tightly integrated subsea inertial navigation. Wideband Doppler velocity navigation (DVL), Long BaseLine (LBL) observations, Simultaneous Localisation And Mapping (SLAM), automatic calibration and forwards-backwards post-processing, join with Acoustically Aided INS (AAINS) to provide robust dynamic sub millimetre relative accuracy and centimetric level accuracy over wide areas. Read on...

UAS at the Beach

The North Sea Canal connects the Port of Amsterdam with the sea. The two breakwaters at the mouth of the harbour in IJmuiden, The Netherlands, are usually monitored on displacement of basalt block by airborne Lidar and on subsidence by annual levelling of permanent points. Could a camera-equipped UAS survey conducted simultaneously with a bathymetric survey provide information of equivalent accuracy? Here, the author shows that it could. Time series of 3D models of the breakwaters are useful for erosion and subsidence monitoring. Read on...

High-resolution multibeam Lidar map, showing spectacularly faulted and deformed seafloor geology. (Source: NOAA Ocean Exploration & Research)
High-resolution multibeam Lidar map, showing spectacularly faulted and deformed seafloor geology. (Source: NOAA Ocean Exploration & Research)

Pushing Lidar to the Limits

Airborne bathymetric Lidar is an ideal tool to study underwater features in the usually rather clear waters along the coast of Australia. Due to the remoteness of many of the continent’s coastlines, this is often the only economically viable option for large-scale bathymetric mapping at high resolution. A new toolkit consisting of two airborne Lidar systems flown on a small and slow-flying research motorglider was trialled in NW Western Australia. The same technology will be used over the next three years in the context of a comprehensive study of submerged archaeological landscapes of the so-called ’Sea Country’, more than 1,000km along the NW Western Australian coast. Read on...

From Concept to Feasibility in Aerial Mapping

Starting in 2005, the French Naval Hydrographic and Oceanographic Office (Service hydrographique et océanographique de la marine [Shom]) and the French National Geographic Institute (Institut National de l’Information Géographique et Forestière [IGN]) began conducting, as part of the national project Litto3D, a series of coastal surveys of metropolitan France and some overseas territories. This article provides insight into the evolution of Shom's expertise in airborne Lidar bathymetry (ALB). Read on...

Technology in Focus: Bathymetric Lidar

With sea level rise and increases in the severity of extreme natural events, there has been a renewed push to further our understanding of the coastal zone. Fundamental to understanding risk in areas of high vulnerability is capturing the near-shore land and sea surface. Bathymetric Lidar is the most effective and cost-efficient technology to capture both the land and seafloor simultaneously to provide a continuous, detailed 3D elevation model along the coastline. Its ability to successfully capture elevation on both sides of the coastline, over areas stretching more than 100km along the coast, has made bathymetric Lidar the ‘gold standard’ for coastal vulnerability and near-shore benthic habitat modelling. Read on...

Bathymetric Lidar
Bathymetric Lidar

Multi-sensor Coastal Mapping

Fugro recently tested a multi-sensor approach to balance growing data needs with limited agency budgets. Coastal mapping programmes are quickly becoming a priority for government agencies across the globe. The desire to better define and understand the land/sea interface is based on several interrelated factors, including sea-level rise and its impacts on coastal populations, the growth of and reliance on a blue economy, and the need to maintain critical nearshore habitats in the midst of a changing landscape. Read on...

 

Last updated: 24/09/2018