Rogers Surveying, PLLC.Rogers Surveying, PLLC.

 

Hydrographic Surveying

                                               
Multiple “On Board” Vessel Workstations: Although all our vessels have workstations the “Red Rogers” has a more extensive networking capacity. The vessel’s intranet, supported by it extended memory and high speed “on board’ computer (necessary to process multibeam data), also allows information to be shared between workstations at a much higher speed. When necessary this allows us to process and edit the prior day’s data “on board” while performing today’s survey. Its “office like” workstations interface to an engineering-size plotter (Hewlett-Packard Design Jet 750C Plus) makes it possible for our crew to come off the vessel with a finished plot, in black and white or color, signed and sealed by the on-board Licensed Land Surveyor and Certified Hydrographer. 

We can submit Hydrographic, Beach, Topographic and Cadastral surveys in AutoCAD, MicroStation format, complying with EM1110-1-1807 Standards Manual for the U.S. Army, Corps of Engineers, Computer-Aided-Design and Drafting (CADD) Systems. We also use the latest software versions for volume computations, Digital Terrain Modeling (DTM) and contouring. Software is continuously upgraded as upgrades become available.  The Quality Assurance and Quality Control Section later describes some of the procedures used by Rogers Surveying to ensure the highest level of Quality Surveys for each and every Client. In this section Rogers Surveying addresses the latest software specified by the RFP. USACE NYD CADD requirements release 2; methods of establishing second order class II horizontal and vertical control, Bentley Microstation, Intergraph InRoads and Coastal Oceanographics HyPack 6.2 to collect field data. The QA section also demonstrates our ability to provide acceptable data formats with consistency, work with State Plane Coordinate Systems NAD27 and NAD83 and meet all the USACE NYD hydrographic specifications.

  

Methodology

When performing multibeam surveys, Rogers Surveying adheres to the U.S. Army Corps of Engineers EM 1110-2-1003 recommendations for swath width settings. With a minimum of 60% bottom coverage, enough data redundancy is generated to allow sufficient quality control to produce a final product truly representative of the existing survey area.  From inventory we choose the tide data-logging device best suited for the project. In most cases a WL16 Water Level Logger is used for recording the tide. Prior to multibeam survey operations the WL16 Tide Gauge data logger is installed at a dock or other suitable and secure location and referenced to a tide board, previously referenced to the project vertical datum. Once this is done a float test is performed to confirm that 1) the RTK GPS tide reading on the survey vessel agrees with the tide board at the dock and 2) the survey vessel transits to the survey site. Hence the multibeam data collection can commence. Once at the survey site, we lower the multibeam transducer head and perform a sound velocity profile (SVP). The information from the SVP is used to provide the Reson 7101 multibeam processor with a water surface sound velocity value used for beam steerage. In addition the sound velocity profile is used in the Hypack data acquisition and processing software and applied to the multibeam data.


Having performed and applied the SVP correction, multibeam data collection may began. Survey lines are run such that the required data overlap is acquired, and also in manner that minimizes the risk of damage to survey vessel. This is especially important at sites where the bottom may rise quickly or where wrecks or other debris is suspected to exist.


Constant monitoring of the Reson 7101 screen and adjustment of range, transmit/ receive power settings are made if required to accurately map and encompass the swath width needed. In addition to monitoring the Reson 7101, it is also necessary to monitor the Hypack navigation software, which provides quality information on GPS and inertial navigation sensors, motion reference unit sensor and the multibeam data from the Reson 7101. Sound velocity profiles are taken during the course of the survey using a Sea Bird SBE 19plus Version 2 CTD. Casts are obtained before, during and after each survey period, and may be taken more often to account for any expected water column spatial or temporal changes. The SeaBird is calibrated by the manufacturer on a yearly basis and is periodically checked against our Odom Digibar Pro velocity profiler.

Single-beam Hydrographic Surveys

The staff selected to perform the assignments pertaining to this contract have been part of the Rogers organization for many years. All have participated in previous “On Call” contracts for the Port Authority of New York & New Jersey, “Indefinite Delivery Contracts for the U.S. Army Corps of Engineers and Consolidated Edison of New York. Currently, Rogers has two full-time hydrographic survey crews available daily. Each crew has a minimum of one U.S. Coast Guard Licensed Captain, an A.C.S.M. Certified Hydrographer and Licensed Land Surveyor on the survey vessel.


Rogers Surveying utilizes a number of different survey platforms to provide single-beam survey data. The “Fin Kennedy” is our primary single-beam vessel and is used on inland waterway projects to an approximate under keel depth of 5’. For shallower and/or less accessible areas the preferred vessel would be our “Boston Whaler” or one of our aluminum “Jon Boats”, a 10’ Polarcraft and a 14’ Weldcraft.

The methodology for conducting the surveys is very similar, although the equipment configuration differs slightly for each vessel. All surveys conform at a minimum to the most current version of the USACOE Engineer Manual. HYPACK®: Hydrographic Survey and Processing Software is used for design of channel provided or Rogers determined survey lines such that the survey coverage is suitable for the type of survey requested. During the survey HYPACK® is used for all survey sensor interfacing, data acquisition, display of electronic charting and planimetrics, and automatic quality control checks. On completion of survey HYPACK® is used for data processing and generation of a usable data set that can be imported to AutoCAD, ArcMap or Microstation.   

Gallery

  • Beach Survey History
  • Sidescan Magnetometer
  • Sidescan Sonar
  • Remediation Site
  • Erosion
  • Contour Map
  • Workstation
  • Surveying
  • Sidescan Piggy
  • MB Draped
  • Multibeam Anchor
  • Multibeam Anchor
  • Multibeam Anchor 2
  • Recovered Anchor
  • Red Rogers
  • Robert Kirkland
  • USS Intrepid
  • NY Harbor