Technical resources to support shallow water hydrographic surveying
Technical resources to support shallow water hydrographic surveying
What is an Echogram – Full Water Column Echo Envelope?
The CEESCOPE™ and CEE-ECHO™ output and record a high definition echogram, which is advantageous for determining accurate bathymetry. In addition to providing a complete record of the survey raw data, the echogram allows detailed post processing of recorded soundings to edit inaccurate or spurious depth signals, impossible to achieve with “black box” echo sounders.
The Value of a Digital Echogram – Surveying over Sub Aquatic Vegetation
The CEESCOPE™ and CEE-ECHO™ output a high definition echogram, a view of the sonar echo envelope from the entire water column. That is not just a depth sounding value from each ping. The echogram output offers substantial benefits for surveys conducted in areas with sub-aquatic vegetation.
The Value of a Digital Echogram – Surveying over a Soft Bottom
A dual frequency echo sounder is usually used for surveys where the bottom may be poorly defined, or when sediment resuspension is occurring, such as during dredging. In addition, collecting a digital echogram using the CEESCOPE™ or CEE ECHO™ helps provide a detailed view of the bottom and sub-bottom to allow proper identification of the hard and soft bottom surfaces.
Understanding Transducer Beam Angles and Data Artifacts
The effect of the transducer beam angle on single beam hydrographic data may be quite significant in some survey scenarios, such as when vertical structures or steep slopes may be included in the survey area. Understanding the beam footprint of various transducers is useful in product selection and the limitations of wider beam transducers should be recognized.
How the CEE-USV™ Uses Exact Time-Stamped Data to Prevent Telemetry Errors
In order to maintain exceptional data quality with telemetered data when using the CEE-USV™ unmanned survey boat, the CEESCOPE LITE™ echo sounder applies a precise time tag to all data recorded internally and output to the shore over the radio. The results of a field test using the latest HYPACK® driver are shown.
Introduction to the Hydrographic Survey Workflow When Using the CEE-USV™
To provide some insight into the general method of using the CEE-USV™ for hydrographic surveying, particularly for those not familiar with hydrographic surveying procedures, a simplified workflow is presented to outline the basic steps taken from project setup to data export.
Driver Selection in HYPACK for the CEESCOPE™ and CEE ECHO™
HYPACK offers two methods to acquire data when using CEE echo sounders with the proprietary time-stamped output format. When using the echo sounder and GNSS alone, as in most SBES surveys, the special CEE time stamps may be used for maximum timing precision. If using ancillary devices without time stamped data such as side scan, an alternative driver setup is required.
Technical Review – Driver Selection in HYPACK for the CEESCOPE™ and CEE ECHO™
This technical document describes in detail the criteria for appropriate driver selection in HYPACK when using the CEE ECHO™ or CEESCOPE™ with or without additional instruments (e.g. side scan sonar). This may be used as a reference guide for setup options with HYPACK.
Understanding and Selecting Blanking Modes for the CEESCOPE™ and CEE ECHO™
Echo sounders with the appropriate 2020 year firmware are able to operate in three different blanking modes, useful for shallow water surveys – particularly when using the CEE-USV™. The ADAPTIVE, MINDEPTH, and MANUAL blanking modes are explained and illustrated to allow the user to make an informed choice for each survey.
Using the CEESCOPE™ with NTRIP Network RTK Corrections through HYPACK or Hydromagic
The CEESCOPE™ is able to receive network RTK corrections from an acquisition device connected to the internet. Owing to its built-in network connectivity, NTRIP RTCM data may be passed to the CEESCOPE’s integrated GNSS receiver through the same Ethernet LAN cable or WiFi connection as the survey data is transmitted. With no additional hardware or cables, this represents a simple and effective method to acquire RTK precise survey data.
Using the CEESCOPE-R™ with WiFi and SBG Systems Ellipse2-E Motion Reference Unit for Jet Ski Surveys
The CEESCOPE-R™ is a unique echo sounder system that adds WiFi connectivity and a convenient Motion Reference Unit / Inertial Navigation System interface. With few cables and a highly streamlined setup, the system is ideal for surveying in challenging environments such as the surf zone on a personal watercraft (Jet Ski).
Using RAW GNSS Data Recorded on the CEESCOPE™ for Post Processed Precise Positioning in HYPACK®
The CEESCOPE® records raw GNSS data on its internal memory which can be extracted and used in post processing to recompute a precise positioning dataset after corrections using a reference station. The new position data may be inserted into HYPACK® in place of the original uncorrected data. This feature allows RTK-quality data to be collected in the absence of a local base station radio telemetry link or cell phone VRS network.
Importing CEESCOPE™ and CEE ECHO™ Data into HYPACK and Hydromagic Projects
The CEESCOPE™ records raw GNSS data on its internal memory or a connected USB flash drive which can be extracted and used in post processing to recompute a more accurate position solution. These data may be easily imported into a HYPACK or Hydromagic project for editing, however it is important to follow the appropriate procedure to ensure the desired project geodesy and measurement units are properly set up in the final data file.
Using the CEESCOPE™ and CEE ECHO™ in RTK Mode on a Local Grid
For land surveyors, the process used in hydrography to collect the coordinate position and elevation data underwater might be unfamiliar. However, using an RTK-enabled system it is easy to collect data that will fit seamlessly into separately collected land survey datasets using the same RTK GNSS receivers / base station.
Using an External GNSS Receiver with the CEE ECHO™ – Introduction
The CEE ECHO™ is designed to take in NMEA0183 format position from a GNSS / GPS receiver and merge the position data with echo sounder data simultaneously being recorded. The combined data stream is output to an acquisition software package.
Using an External GNSS Receiver with the CEE ECHO™ – Detailed Setup Guide
There are several benefits from passing GNSS data to the CEE ECHO™ instead of directly to the acquisition PC. The position and depth data may be viewed on the CEE ECHO™ LCD, data may be recorded internally, and precise time stamps may be applied to the data for a low latency solution.
Considerations for Using the CEESCOPE-RTK Echo Sounder with an RTK Base Station
In order to receive RTK corrections from a base station, the data format and radio transmission format must be matched. Sometimes there is some confusion about pairing GNSS equipment from different manufacturers, with the concern that the base station must match the rover receiver. However as long as the formats are properly selected there should be few concerns about GNSS brand used.
Surveying Around Bridges Using the CEESCOPE™ and CEE ECHO™
The CEESCOPE™ and CEE ECHO™ record time-stamped data in the absence of a valid GNSS / GPS fix. This feature can be used in post processing to correct poor or unusable bathymetry data collected in areas where the sky view is restricted. Using interpolation, approximate positions can be assigned to the sounding depths collected during the GPS loss.
Using the CEE LINE™ with the Trimble TSC3 Data Collector and Trimble Access or Geometius BathySurvey App
The CEE LINE™ is a “plug and play” solution for the Trimble TSC3 data collector. With no Bluetooth or batteries to worry about, the echo sounder is powered and controlled entirely by the data collector. The quick-start setup guide explains the process for using the CEE LINE™ within the Trimble Access environment.
Using the CEE LINE™ with Carlson SurvCE Acquisition Software
The CEE LINE™ echo sounder may be used as a peripheral hardware input while GNSS surveying using Carlson software. Connection of the echo sounder to a GNSS data collector using SurvCE represents a simple and effective method to conduct basic hydrographic surveys
Using the CEESCOPE™ and CEE ECHO™ with HYPACK® to Accurately Map Sub Aquatic Vegetation Extents
To determine the extent of sub aquatic vegetation coverage and the plant height, the echogram feature of advanced CEE echo sounders may be used in combination with HYPACK® editing and visualization tools to provide a simple and very effective habitat mapping option. An example Eelgrass survey in San Diego Bay, USA demonstrates the process.
All Echo Sounders are not Created Equal – Ping Rates Matter
The echo sounder ping rate is a key feature that should be considered when selecting a single beam sonar system for bathymetry. Low ping rates (<5 Hz) cannot provide adequate coverage in challenging environments, and the advantages of high ping rates partly lie in data processing after the survey is completed.
How the CEESCOPE™ was used to Find a Missing Structure
An unusual challenge was presented: use the dual frequency CEESCOPE™ to locate a 30m structure that had vanished – presumably sunk. The data processing in HYPACK® described in this article illustrates some general concepts relating to single beam echo sounder data and transducer properties.
CEE VIEWS – Why we do not make Echo Sounders with Paper Chart Recorders
Despite there occasionally still being a requirement for paper records supporting single beam hydrographic surveys, we choose not to offer any echo sounders that have this feature. Besides focusing more on portable units where paper is of no value, here are our thoughts on why we believe the paper chart to be entirely unnecessary.
CEE VIEWS – Why Single Beam Echo Sounders Continue to have a Place Alongside Multibeam
For many surveys, multibeam echo sounders have become the instrument of choice. However this is far from true for many types of hydrographic survey where a single beam echo sounder, possibly combined with a side scan sonar, offers the most attractive solution.
CEE VIEWS – Industrial Water Hydrographic Surveying
CEE HydroSystems’ equipment is used around the world for industrial water surveying – mine tailings ponds, process water reservoirs, paper mill effluent ponds, municipal waste water, oil field frac pits, and chemical plants. Some of the main topics involved in single beam hydrographic surveying in the industrial environment are discussed in this article. If you have survey projects in industrial water READ THIS ARTICLE before you get started.
CUSTOMER PROJECT – Using a Dual Frequency CEE ECHO and a USV to Evaluate Mine Tailings Deposition
In addition to providing valuable water volume data for site water balance models and tailings storage facility (TSF) operations, using advanced echo sounder techniques may also provide insight into tailings deposition pattern and compaction processes. This paper as presented by Newfields LLC at the Tailings and Mine Waste 2016 conference in Keystone, CO, USA describes an unmanned survey vehicle approach to tailings dam bathymetry.
CUSTOMER PROJECT – Using the CEESCOPE™ with Hydromagic and RosePoint ECS Navigation Software
In order to provide navigation surveys for US inland river transportation, Eye4Software Hydromagic may be used to generate surveys that can be imported into RosePoint ECS as a chart overlay. This article outlines the required software and hardware setup to allow the two software packages to simultaneously access survey data from the CEESCOPE™ echo sounder, and describes the process to import survey data from Hydromagic into RosePoint ECS.
General Hydrographic Survey Procedures
RTK Tide Concepts for Precise Vertical Elevation Correction in HYPACK
Using GNSS height measurements has become the new standard for hydrographic surveying in order to correct elevation changes during the survey. The principle behind “RTK Tides” is simple however confusion may arise about exactly what is going on. This summary may help with some of the basic concepts behind RTK Tides.