Benthic Habitat Mapping

Utilisation of Multi-beam Backscatter for Ecological Study of the Seafloor
The establishment of multi-beam echo sounders (MBES) as a mainstream tool in ocean mapping has revolutionised approaches towards nautical charting, seafloor geotechnical/geological surveys and benthic habitat mapping. The resolution of bathymetric and backscatter data collected by MBES has improved significantly in recent years through technological improvements of these acoustic systems. Furthermore, developments in data collection and processing of MBES backscatter have resulted in the increasing preferential use of multi-beam technology over conventional side-scan sonar or single beam sonar for these applications. This article explores some recent developments in the methods used to generate benthic habitat maps using multi-beam sonar systems.... (read more)
2012-07-26 02:55:45

Submerged Aquatic Vegetation Mapping

In July 2007, a hydrographic survey team from Duck (NC, USA) mapped 6.7 square miles of the Currituck Sound in water depths of less than 3m. The aim was to chart the depth and identify areas of submerged aquatic vegetation (SAV) around the proposed corridor routes for the mid-Currituck Bridge. The team used a pontoon boat equipped with a GeoSwath Wide Swath Sonar along with bottom grab samples to produce a bathymetric map and identify a total of 1.31 square miles of Submerged Aquatic Vegetation (SAV).   Hypack survey software was used to navigate the boat along pre-programmed survey lines... (read more)
2007-12-18 11:56:24

Mapping Diamondiferous Gravel

Using the Aquares Resistivity System on a Fluvial Diamond Concession
An Aquares resistivity survey was carried out in a river in sub-Saharan Africa to map the sub-bottom features of a diamond concession. Diamondiferous gravels were distinguished remotely from bedrock and other soft sediments by the Aquares Resistivity System (ARS), a sub-bottom acquisition and profiling tool. It was selected due to its cost-effective operation and ability to provide qualitative and quantitative results. The ARS utilises recently developed processing innovations, which enable data to be presented in vertical sections and horizontal slices. This facilitates accurate volume calculations and the development of isopach maps for distinguishable types of bedrock and sediments. Acoustic sub-bottomprofiling... (read more)
2009-06-04 12:00:00

Multi-sensor Coastal Mapping

Integrating Active and Passive Sensors Provides Major Gains
Fugro has 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.  (By José Martínez Díaz and Don Ventura, Fugro USA) In support of its hydrographic charting programme, the US National Oceanic and Atmospheric Agency... (read more)
2016-12-13 09:47:02

Expanding Marine Mapping Programme

Following an agreement with the Norwegian Hydrographic Service, SeaZone is rolling out the next stage of its global marine mapping programme. The contract, signed at the 4th Extraordinary International Hydrographic Conference in Monaco, provides SeaZone access to base data for the whole of the North Sea, which will be used to improve the coverage of SeaZone HydroSpatial, and other geographic information products.   SeaZone HydroSpatial is the first "off the shelf" authoritative digital marine mapping, engineered and maintained from raw material from hydrographic offices and other data agencies. HydroSpatial provides reference information comparable with land mapping and is designed for... (read more)
2009-08-18 03:02:31

SHADOWS Mapping Sonar

The delivery of high quality, repeatable data is of paramount importance for the successful collation of any large dataset, particularly when the data is acquired in a number of successive campaigns (as with EEZ mapping, route surveys, debris surveys, pre-seismic surveys, environmental characterization surveys, etc). IXSEAs SHADOWS Mapping Sonar is an innovation in seafloor mapping, that may give the answer.   Aside a Synthetic Aperture Sonar (SAS technology), SHADOWS combines automatic generation in real-time of high-resolution mosaic in GeoTiff format; high-accuracy positioning (the mosaic is generated from the fish position); 600 m true swath (no blind zone at nadir); coverage... (read more)
2008-05-26 12:00:00

Mapping Underwater Habitat

Biosonics’ Visual Habitat DT-X is a software product for the rapid assessment and mapping of aquatic habitat features. With Visual Habitat software, users can present information in a clear and visually captivating display. DT4 data files can be processed to generate full colour maps displaying transects as data layers highlighting bathymetry, plant coverage, plant canopy height and substrate type. When viewing each file echogram, simultaneously the synchronised transect map view can be monitored. This dual-viewing mode of Visual Habitat DT-X allows for visual ground truthing of a plan (map) view with a cross-section (echogram) view. An integrated utility automatically provides... (read more)
2013-08-01 08:36:44

Coastal Mapping During Lidar Conference

Over two days the European LiDAR Mapping Forum (ELMF), taking place at the Salzburg Congress, Austria on 29th and 30th November 2011 will focus on the use of Lidar during two whole sessions dedicated to Coastal Zone, Flood Plain and Bathymetric Lidar.     The gap between land and sea is amongst the most challenging data to acquire. Todd Mitchell, Remote Sensing Manager from Fugro Consultants, addresses the subject of how best to gather survey data in the land/water interface with a review of mobile laser scanning, satellite imagery and airborne geophysical surveys. He will include the advantages and disadvantages... (read more)
2011-11-16 02:36:37

Coastal Mapping Programme Benefits Taxpayers

For every dollar American taxpayers spend on NOAA’s National Geodetic Survey (NGS) Coastal Mapping Programme, the benefits they receive in return are worth more than USD35, according to a recent independent socio-economic scoping study. The programme provides critical baseline data for accurately mapping America’s official shoreline, which is important for national security, maritime shipping and navigation, and provides geographical reference data needed to manage, develop, conserve and protect coastal resources. The study demonstrates the programme’s contributions in marine safety, geographic information, resource management, and emergency response and the wide range of economic and societal activities it supports. David Kennedy, assistant... (read more)
2012-04-10 04:55:52

Mapping Liquid Water on Mars

To tie in with NASA’s recent announcement about the discovery of liquid water on Mars, Esri has put together an interactive story map showing the craters and canyons on Mars that reveal evidence of water. Watch animations of the recurring slope lineae (water stains) across four different craters and explore satellite imagery and elevation data for the 'Red Planet'. Using an imaging spectrometer on MRO, researchers detected signatures of hydrated minerals on slopes where mysterious streaks are seen on the Red Planet. These darkish streaks appear to ebb and flow over time. They darken and appear to flow down steep slopes during... (read more)
2015-09-30 11:55:57
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