Optimizing a Low-cost Multi Sensor System for Hydrographic Depth Determination

Surveying devices with lower costs are being welcomed by hobbyists eager to determine water depth. The Department of Geodesy and Geomatics at HafenCity University (HCU) in Hamburg has been working on cost-efficient solutions in recent years. With shallow water surveys not required to be performed with the accuracy and precision of industrial projects, surveying devices with lower costs are being welcomed by hobbyists eager to determine water depth. With this low-cost demand rising, the investigative development of these products has become a scientific research issue. The Department of Geodesy and Geomatics at HafenCity University (HCU) in Hamburg has been working on cost-efficient solutions in recent years.  The Old Openseamap Project During a project with openseamap.org, a Multi Sensor System (MSS) including an Echo sounder, GPS and inertial measurement unit (IMU) was built up and tested. Despite... (read more)
2019-04-08 01:44:05

The Study of Mapping the Seafloor

What is the Difference Between a Bathymetry Chart and a Hydrographic Chart?
This article will immerse you into the deep water of bathymetry. It explains in detail what a bathymetry map is, what it shows, what methods we use to collect the bathymetry data and, last but not least, how to create a good-quality bathymetry map. It will also cover the difference between a bathymetry chart and a hydrographic chart and the techniques our ancestors used in the past to collect and record depths. What is Bathymetry? Bathymetry is the study of mapping the seafloor. Bathymetric maps represent the ocean (sea) depth as a function of geographical coordinates, just as topographic maps represent... (read more)
2019-01-15 08:58:54

FarSounder Joins NOAA as a Trusted Node

FarSounder is the most recent company to join the International Hydrographic Organization’s Crowd-Sourced Bathymetry (CSB) initiative by becoming a “trusted node” with the NOAA. This project enables mariners to voluntarily contribute seafloor depths measured from their vessels to NOAA’s data repository. The partnership can be seen as a logical step because FarSounder’s customers regularly travel to remote areas with poorly maintained nautical charts, using a FarSounder 3D-FLS for real-time navigation. Due to the development of FarSounder’s Local History Mapping (LHM), the latest feature of its SonaSoft software, users now have the ability to create a real-time chart of the seafloor... (read more)
2018-11-06 09:47:51

Hydrographic Survey Engineer - Swathe Services (UK)

The primary role of the Survey Engineer will be to provide technical support on all survey equipment and software owned and sold to customers by the company.  The position is based at the company’s office in Cornwall, UK and may involve site work to support equipment rental activities and/or customer demonstrations. Main duties: Provide technical support on all survey equipment to customers and the inhouse sales team Support the R&D team with Unmanned Surface Vessel equipment integration Manage the company’s equipment rental pool for booking, tracking & checking procedures Maintain inventory and asset registers and track all calibration and maintenance... (read more)
2018-06-27 11:11:38

Mapping the Seafloor with Remote Sensing and Satellite Imagery

An Analysis of the Techniques and Benefits of These Methods
70% of the Earth is covered by water, but so far just 7% of it has been surveyed (Mars, Venus and the Moon are better surveyed). Hydrography as a science has changed dramatically since the first measurements were made by Alexander Dalrymple and James Cook with lead lines and sextants. Singlebeam echosounders were invented in the 1920s – a technology still used today for mapping the seafloor. This method of using echosounders can produce very high-resolution bathymetric data but the high operational costs and the slow working process make it economically unsuitable for covering large areas. However, with the ongoing expenses of... (read more)
2018-06-19 09:23:54

Teledyne PDS Introduces New Ways of Visualising and Controlling Singlebeams

Teledyne PDS has released a new view to display singlebeam echogram data and to control the singlebeam device. The Online SBES Echogram view and features have been developed to enable singlebeam users in the hydrographic and dredging markets to be more agile in their survey processes. The new features eliminate the need to use external visualisation or command and control software, enabling more screen space for the actual survey information. Currently, Odom DSO data (EchoTrac singlebeams) and RESON GT data (Navisound singlebeams) are supported. The Echogram view has the capability to display up-to four depth channels simultaneously, displaying one channels’... (read more)
2018-06-08 12:12:47

Unmanned Mapping of Ultra-shallow Waters

Tarragona Survey of the Riu Francoli Using an USV
Hydrographic surveying in ultra-shallow, inland and enclosed waters can prove extremely challenging and often presents increased risks and obstacles to both personnel and equipment. These considerations include health and safety issues, potential damage to equipment, lack of suitable launch sites and regions where submerged debris and physical seabed characteristics can make an area particularly hazardous to survey. In these locations, traditional manned survey vessels are often unsuitable, inefficient or incapable of completing a successful survey. In November 2016, Unmanned Survey Solutions, with support from Swathe Services, was tasked with completing a hydrographic survey of such an area.  Survey Layout Located... (read more)
2017-07-11 01:22:08

Autonomous Vessel as Enforcer

Patrolling Marine Protection Areas
There are currently 13,764 Marine Protection Areas (MPAs) jointly covering over 2% of the oceans. One such MPA is Malaysia’s newly formed Tun Mustapha Park comprising 1 million hectares of marine park and shark sanctuary in northern Borneo. Governance, management, effective real-time situational awareness and enforcement are essential for the preservation of the resources in these water spaces and especially the hundreds of fish species that they support. The development and deployment of unmanned surface vehicles (USVs) offers a potentially long-term and cost-effective solution. Arguably the key challenge is the scourge of Illegal, Unregulated and Unreported fishing (IUU), which has... (read more)
2016-07-26 11:55:17

Amplified Sediment Waves in the Irish Sea (AmSedIS)

Understanding Big Sand Wave Behaviour
Large sediment waves are striking yet poorly understood seabed features in many shelf seas. Very large sediment waves (3–18m in height) have been documented to migrate up to 70m per year in the Irish Sea and some sand waves reach heights of up to 36m (Figure 1). Such transport of enormous sediment volumes can endanger the stability of submarine pylons, cables and pipes and they cause a highly mobile benthic habitat. To understand the dynamics of these sediment waves, we identified that we need to focus our investigation on the effects of sediment grain size variability, the availability of mobile... (read more)
2014-04-07 01:31:38

Update for SonarMite Driver

The SonarMite.dll is a singlebeam echosounder driver for the Ohmex SonarMite SBES. Having remained unchanged since it was first written years ago, it has now been updated. It appears also to give an output of roll, pitch, heave, battery condition and a current depth relative QA value in its string. Hypack has modified the drive so that it now displays the battery status in real time while in survey mode without being logged in the raw file. The new driver will now also record the quality code as a second depth in the raw file which can be displayed in... (read more)
2014-03-27 12:00:00
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