OPR-J348-KR-17Mississippi Sound and VicinityBiloxi, MSDavid Evans and Associates, Inc.H1306025 NM North of Ship IslandMississippiUnited States200002017Jonathan L. Dasler, PE, PLS, CHNavigable Area2017-11-032017-08-272017-11-30Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersUniversal Transverse Mercator (UTM)UTCAtlantic Hydrographic BranchContractorDavid Evans and Associates, Inc. (DEA) conducted a hydrographic survey of the assigned area in the Mississippi Sound and vicinity. Survey H13060 was conducted in accordance with the Statement of Work (July 21, 2017) and Hydrographic Survey Project Instructions (November 3, 2017). The Hydrographic Survey Project Instructions reference the National Ocean Service (NOS) Hydrographic Surveys Specifications and Deliverables Manual (HSSD), 2017 as the technical requirements for this project. The Mississippi Department of Marine Resources (MDMR) required DEA to obtain a scientific research permit for research and data collection activities in Mississippi marine waters. A copy of this permit is included in the Project Correspondence.30.367824305689.049259111130.291033305688.784918Survey Limits were surveyed in accordance with the requirements in the Project Instructions and the HSSD.OPR-J348-KR-17 Assigned Survey Areasfile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/OPR-J348-KR-17_Assigned_Survey_Areas.pngThe purpose of this project is to provide contemporary surveys to update National Ocean Service nautical charts and products. This hydrographic survey will support the dense vessel traffic transiting the Intracoastal Waterway extending from Biloxi to Pascagoula, Mississippi as well as the local fishing vessels and recreational boaters transiting further inshore. This area has been inundated by eight major tropical storms and hurricanes since it was last surveyed, including Hurricane Katrina. This survey will update the regional bathymetry and address over 50 chart discrepancies. In addition, this survey data will support the State of Mississippi and United States Army Corps of Engineers Mobile District as they plan a large barrier island restoration project in the vicinity of Ship Island. Survey data from this project is intended to supersede all prior survey data in the common area.The entire survey is adequate to supersede previous data.All waters in survey area Acquire backscatter data during all multibeam data acquisition (HSSD Section 6.2)Sheets 2 & 3: All waters within the charted anchorage areaObject Detection Coverage (Refer to HSSD Section 5.2.2.2)Sheets 2 & 3: All waters outside of the charted anchorage area. Sheets 4 - 6: All waters in Survey area. Sheet 7: Water depths less than 4 m. 200 m Set Line Spacing MBES (Refer to HSSD Section 5.2.2.4 Option A) Note: All charted depths falling between sounding lines and shallower by two feet or greater than adjacent water-level corrected surveyed soundings shall be verified or disproved. Verification and disproval of these charted depths shall be accomplished by performing a star-like pattern using three lines centered on the charted depth and each extending 1 mm at chart scale. All significant shoals or features found in waters less than 20 m deep shall be developed to complete coverage standards.Survey H13060 was designated as Sheet 2 in the Project Instructions. Multibeam echosounder (MBES) data with time series backscatter was acquired at 200-meter Set Line Spacing coverage in all waters in the survey area up to the 2-meter contour. This coverage type follows Option A of the 200-meter Set Line Spacing MBES requirement specified in Section 5.2.2.4 of the 2017 HSSD. All charted depths shallower than adjacent surveyed soundings by two feet or greater were investigated with three independent survey lines for verification or disproval. Complete coverage multibeam was obtained within the search radii (Within sheet limits: 100 meters for features labeled with "PA" or "rep", 150 meters for features labeled with "PD" or "ED", and 50 meters for all features without a position qualifier. Outside sheet limits: 160 meters for features labeled with "PA" or "rep", 240 meters for features labeled with "PD" or "ED", and 80 meters for all features without a position qualifier) for all feature disapprovals. Survey coverage was obtained within the survey area depicted in the Project Reference File (PRF) OPR-J348-KR-17_PRF_FINAL.000. During the project, the Project Instructions were revised to include a waiver to the Set Line Spacing surveys requirements; allowing the acquisition of bathymetric splits for the development of significant shoals in lieu of the HSSD requirement to develop with complete multibeam coverage. Additional time saved through this waiver was devoted to the development of contours falling at intervals included on NOS charts. Survey lines acquired for contour development were run both parallel and orthogonal to the shoreline. The modification for Set Line Spacing survey requirements did not impact survey H13060. Object Detection MBES and time series backscatter was obtained for all waters within the charted anchorage area. This coverage follows Object Detection MBES requirements specified in Section 5.2.2.2 of the 2017 HSSD. Coverage for the survey limits for H13062 are shown in Figure 2. H13060 Survey Outlinefile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/H13060_SurveyOutline.pngS/V Blake0537.980000037.480R/V John B. Preston071.66000008.8600609.640000046.3407.60000040.332017-08-272017-08-282017-08-292017-09-102017-09-112017-09-122017-09-142017-09-152017-09-222017-09-232017-10-052017-10-152017-10-262017-10-272017-11-042017-11-282017-11-30The OPR-J348-KR-17 Data Acquisition and Processing Report (DAPR), previously submitted with survey H13067, details equipment and vessel information as well as data acquisition and processing procedures. There were no vessel or equipment configurations used during data acquisition that deviated from those described in the DAPR.S/V Blake834.5R/V John B. Preston331.3S/V Blakefile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/Blake.pngR/V John B. Prestonfile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/Preston.pngTeledyne RESONT50-PMBESApplanixPOS MV 320 v5Positioning and Attitude SystemRolls Royce / AML OceanographicMVP30-350 with AML Micro SV&PPrimary Sound Speed ProfilerAML OceanographicSmartXPrimary Sound Speed ProfilerAML OceanographicMicro SV XchangeSurface Sound SpeedSea-Bird ScientificSBE 19+ SeaCAT CTDSecondary Sound Speed ProfilerAML OceanographicSV Plus V2Secondary Sound Speed ProfilerTrimbleSPS751RTK ReceiverTrimbleSPS851RTK ReceiverCSI WirelessMBX-3SDGPS/Beacon ReceiverTrimblePro BeaconDGPS/Beacon ReceiverFor the object detection anchorage coverage and 200-meter set line spacing coverage sections exclusively, multibeam crosslines acquired for this survey totaled 4.91% and 8.47% of mainscheme acquisition, respectively. Crosslines were run across the entire survey area in order to provide a varied spatial and temporal distribution for analysis of internal consistency within the survey data. Crossline analysis was performed using the CARIS Hydrographic Information Processing System (HIPS) Quality Control (QC) Report tool, which compares crossline data to a gridded surface and reports results by beam number. Crosslines were compared to a 4-meter CUBE surface encompassing mainscheme, fill, and investigation data for the entire survey area. The QC Report tabular output and plot are included in Separate II. The results of the analysis meet the requirements as stated in the 2017 HSSD. Additional crossline analysis was performed by computing a 4-meter CUBE surface from the crossline data. The surface was then differenced from a 4-meter surface comprised of all mainscheme, fill, and investigation data. The resultant difference surface was exported using the Base Surface to ASCII function and statistics were compiled on the ASCII data. Results from the crossline to mainscheme difference analysis are depicted in Figure 5. The primary contributors to the largest differences (+/- 20 centimeters) are tide zoning, sound speed artifacts, and minor horizontal offsets in the vicinity of a trench. Horizontal offsets are well within HSSD requirements and the expected accuracy of the DGPS positioning system.H13060 Crossline Differencefile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/H13060_XL_MS.png00TCARIS/V Blaken/a1.00.5R/V John B. Prestonn/a1.00.5Additional discussion of these parameters is included in the DAPR. During surface finalization in HIPS, the "Greater of the two values” option was selected, where the calculated uncertainty from Total Propagated Uncertainty (TPU) is compared to the standard deviation of the soundings influencing the node, and where the greater value is assigned as the final uncertainty of the node. The uncertainty of the finalized surfaces increased for nodes where the standard deviation of the node was greater than the TPU. Real-time sonar uncertainty was not logged to the Hypack HSX file for all R/V John B. Preston data collected prior to September 19, 2017 (DN262). TPU was computed using HIPS device model values for the Teledyne RESON as selected in the HIPS Vessel File (HVF). The resulting calculated uncertainty values of all nodes in the finalized 0.5-meter Object Detection Coverage multibeam surface range from 0.08 meters to 0.23 meters with a standard deviation of 0.004 meters. The resulting calculated uncertainty values of all nodes in the finalized 4-meter Set Line Spacing Coverage multibeam surface range from 0.08 meters to 0.19 meters with a standard deviation of 0.016 meters. To determine if surface grid nodes met International Hydrographic Organization (IHO) Order 1 specification, a ratio of the final node uncertainty to the allowable uncertainty at that depth was determined. As a percentage, this value represents the amount of error budget utilized by the uncertainty value at each node. Values greater than 100% indicate nodes exceeding the allowable IHO uncertainty. For the 0.5-meter Object Detection Coverage multibeam surface, the allowable uncertainty utilized ranges from 17% to 46%. The mean allowable uncertainty for the surface is 28% with a standard deviation of 0.007. For the 4-meter Set Line Spacing Coverage multibeam surface, the allowable uncertainty utilized ranges from 16% to 38%. The mean allowable uncertainty for the surface is 27% with a standard deviation of 0.031.Survey H13060 junctions with prior surveys H11618 and H11619 and with current survey H13059. The Bathymetric Attributed Grids (BAGs) for surveys H11618 and H11619 were provided by NOAA for comparison with H13060. The finalized H13060 surface was compared to each junction survey by generating a difference surface using CARIS HIPS.H11618200002007OceaneeringNWThe mean difference between H13060 and H11618 survey depths is 36 centimeters (H13060 deeper than H11618). The surveys show differences that can be expected given the age of the prior survey and the difference in water level application. The majority of differences observed in the junction analysis are within the IHO Order 1 allowable uncertainty in the depth range of the survey. In a few areas, differences exceed the allowable vertical uncertainty. The hydrographer is unable to explain the observed bias between the surveys though the prior survey was controlled by zoning from the CO-OPS water level station at Gulfport Harbor, MS (8745557) while the present survey used TCARI correction from three other local gauges. The gauge at Gulfport Harbor, MS is no longer operational. The office notes in the Descriptive Report for prior H11618 survey describe a tide application issue which was addressed by the processing branch.Junction results between H13060 4-meter and H11618 2-meter bathy gridsfile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/H13060_4m_H11618_2m_Junction.pngH11619200002007OceaneeringNThe mean difference between H13060 and H11619 survey depths is 36 centimeters (H13060 deeper than H11619). The surveys show differences that can be expected given the age of the prior survey and the difference in water level application. The majority of differences observed in the junction analysis are within the IHO Order 1 allowable uncertainty in the depth range of the survey. In a few areas, differences exceed the allowable vertical uncertainty. The minimum values reported in the difference comparison occur at the base of a breakwater constructed after prior survey H11619. The breakwater is located along the northern boundary of the survey area. As with survey H11618, the hydrographer is unable to explain the maximum difference values or observed bias. The Descriptive Report for prior survey H11619 also describes known tide application issues, some of which appear to have been addressed by the processing branch. The prior survey was controlled by the CO-OPS water level station at Gulfport Harbor, MS (8745557) which is no longer operational.Junction results between H13060 4-meter and H11619 5-meter bathy gridsfile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/H13060_4m_H11619_5m_Junction.pngH13059100002017David Evans and Associates, Inc.SAt the time of writing, data from survey H13059 was still being processed. The Descriptive Report for H13059 will include the junction analysis with H13060.Quality control is discussed in detail in Section B of the DAPR. Results from weekly position checks and weekly multibeam bar checks are included in Separate I Acquisition and Processing Logs of this report. Sound speed checks can be found in Separate II Sound Speed Data Summary of this report. Multibeam data were reviewed at multiple levels of data processing including: CARIS HIPS conversion, subset editing, and analysis of anomalies revealed in CUBE surfaces.No delayed heave appliedDue to a faulty network switch, delayed heave logging stopped suddenly on August 27, 2017 (DN239). As a result, delayed heave and delayed heave RMS have not been applied to survey lines 2017BL2392152 and 2017BL2392326. Total Vertical Uncertainty (TVU) was computed with values included in the HIPS Vessel File (HVF).None ExistThere were no other factors that affected corrections to soundings.Approximately 15-minute intervalsA Rolls Royce Moving Vessel Profiler (MVP) and an AML SmartX were the primary instruments used to acquire sound speed readings during multibeam operations for the S/V Blake and the R/V John B. Preston, respectively. Sound speed readings were measured at approximately 15-minute intervals during survey operations. Additional discussion of sound speed methods can be found in the DAPR. One sound velocity profile was obtained approximately 1600 meters from the sheet extents on August 27, 2017 (DN239) at 07:56. This profile is valid and has been applied to the survey.Survey speeds were maintained to meet or exceed along-track sounding density requirements. Multibeam data was thoroughly reviewed for holidays and areas of poor quality coverage due to biomass, vessel wakes, or other factors. Obtained depths were compared to existing charts at specified scales to develop sounding disproval line plans for all charted soundings that were shallower than 2 feet or greater. Complete coverage multibeam was acquired inside the disproval radii for assigned charted features and over all new features. Additional discussion of coverage methods can be found in the DAPR.DensityThe sounding density requirement of 95% of all nodes, populated with at least five soundings per node,was verified by exporting the density child layer of the finalized CUBE surface to an ASCII text file and compiling statistics on the density values. More than 99% of all final CUBE surface nodes contained five or more soundings.Roll Sensor ApplicationHYPACK acquisition software was setup to record data using datagram version 1 while applying real-time roll stabilization during acquisition on the R/V John B. Preston. Datagram version 1 was applied from September 13, 2017 (DN256) – September 18, 2017 (DN261). As a result, roll application was set to ‘No’ in the HIPS vessel file (HVF) for all data included for the applicable dates. Additional information for the HVF is discussed in detail in Section B2.b of the DAPR.Data reduction procedures for survey H13060 are detailed in the DAPR. A summary multibeam processing log is included in Separate I of this report.All sounding systems were calibrated as detailed in the DAPR.Multibeam backscatter was logged in Hypack 7k or Teledyne s7k format and included with the H13060 digital deliverables. Data were processed periodically in CARIS HIPS to evaluate backscatter quality but the processed data is not included with the deliverables. For data management purposes, the names of multibeam crosslines have been appended with the suffix _XL. This change was made to HIPS files only. The original file names of raw data files (Hypack HSX and 7k, Teledyne s7k) have been retained. Prior to September 19, 2017 (DN262), the R/V John B. Preston collected Hypack HSX lines without the accompanying 7k file. On these days, the Teleydyne s7k file (containing navigation, bathymetric and backscatter data) has been submitted with the preprocess data to fulfill the backscatter requirement. The s7k files have been submitted for the following days: September 14, 2017 (DN257) September 15, 2017 (DN258)CARISHIPS/SIPS10.3.1NOAA Profile Version 5.6A detailed listing of all data processing software is included in the OPR-J348-KR-17 DAPR.H13060_MB_50cm_MLLWCARIS Raster Surface (CUBE)0.53.6564.295NOAA_0.5mObject Detection MBESH13060_MB_50cm_MLLW_FinalCARIS Raster Surface (CUBE)0.53.6564.295NOAA_0.5mFinalized Object Detection MBESH13060_MB_1m_MLLWCARIS Raster Surface (CUBE)11.2555.196NOAA_1mComplete MBESH13060_MB_1m_MLLW_FinalCARIS Raster Surface (CUBE)11.2555.196NOAA_1mFinalized Complete MBESH13060_MB_4m_MLLWCARIS Raster Surface (CUBE)41.2935.193NOAA_4mSet Line Spacing MBESH13060_MB_4m_MLLW_FinalCARIS Raster Surface (CUBE)41.2935.193NOAA_4mFinalized Set Line Spacing MBESBathymetric grids were created relative to Mean Lower Low Water (MLLW) in CUBE format using Object Detection Coverage for the anchorage area, Complete Coverage for charted feature radii, and 200-meter Set Line Spacing coverage requirements as described in the HSSD. The 1-meter bathymetric grid is being submitted for feature investigations and disprovals, and meets Complete Coverage requirements inside the assigned disproval radii or over new feature investigations. The extents of the surface, which contains data from investigation and mainscheme surveys lines, was limited to the extents of the investigation and disproval data upon creation. Analysis and QC of data outside of the radii has not been completed. Operations Branch staff provided guidance on the submittal of the 1-meter Complete Coverage surface via email on March 7, 2018 (included with Project Correspondence) and by phone on March 14, 2018.A complete description of the horizontal and vertical control for survey H13060 can be found in the OPR-J348-KR-17 Horizontal and Vertical Control Report (HVCR), submitted under a separate cover. A summary of horizontal and vertical control for this survey follows.Mean Lower Low WaterDauphin Island873-5180Pascagoula874-1533Bay Waveland874-7437TCARIJ348KR2017Rev.tcPreliminaryThe TCARI file J348KR2017Rev.tc was provided with the project instructions and used for sounding correction within the assigned survey area. The primary water level stations experienced no down time during periods of hydrographic survey up to delivery of this report.North American Datum 1983Projected UTM 16NEnglish Turn, LA (293 kHz)CARIS HIPS Projection (+ Unknown)Processing was completed in CARIS HIPS software version 10.3.1. During project setup in the software, the horizontal coordinate reference system was specified as the North American Datum 1983 (NAD83) UTM zone 16N. During processing it was observed that CARIS displays the reference system as: NAD83/UTMzone16N +Unknown [NA83]. Analysis of the projection parameters indicates that the ‘+ Unknown’ is a vertical datum that has been permanently attached to the HIPS database file. A CARIS help ticket was submitted in order to eliminate the ‘+ Unknown’. CARIS responded that the ‘+Unknown’ is a display issue only and does not affect the data. CARIS is unable to address the removal of the ‘+Unknown’ at this time. Therefore, the HIPS project file being submitted for this project, while being appropriately projected to UTM zone 16N, does carry in its metadata the additional ‘+ Unknown’ relating to its vertical datum. The vertical datum for this project has been verified to be MLLW.The majority of the chart comparisons were performed by comparing H13060 depths to a digital surface generated from electronic navigational charts (ENCs) covering the survey area. A 50-meter product surface was generated from a triangular irregular network (TIN) created from the soundings, depth contours, and depth features for each ENC scale. An additional 50-meter HIPS product surface of the entire survey area was generated from the finalized MBES CUBE surfaces. The chart comparison was conducted by creating and reviewing the resultant difference surface. The chart comparison also included a review of all assigned charted features within the survey area. The relevant charts used during the comparison were reviewed to check that all US Coast Guard (USCG) Local Notice to Mariners (LNMs) issued during survey acquisition and impacting the survey area were applied and addressed by this survey.US5MS11M40000542017-12-052018-02-20falseIn general, surveyed depths range from 1 foot shoaler to 2 feet deeper than charted on ENC US5MS11M. The greatest difference is on the wreck with depth unknown (cleared to 2 ft. 1974) which was disproved by the survey.Depth difference between H13060 and chart US5MS11Mfile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/H13060_ChartComp_Band5.pngUS4MS12M80000292017-09-282018-02-20falseIn general, surveyed depths range from 1 foot shoaler to 5 feet deeper than charted on ENC US4MS12M. Like the band 5 ENC, the large 10-foot difference is on the aforementioned charted wreck.Depth difference between H13060 and chart US4MS12Mfile:///P:Project/NOAA00000028/0600INFO/0670Reports/H13060/Descriptive_Report/SupportFiles/H13060_ChartComp_Band4.pngNo Maritime Boundary Points were assigned for this survey.This survey contains ten assigned features labeled as Position Approximate (PA) inside the survey area and six that are outside of the survey area. All sixteen of these features were disproved with 100% MBES coverage and are included in the FFF with the description of ‘Delete’. The survey area contains one assigned features labeled as Position Doubtful (PD). The feature was disproved with 100% MBES and is included in the FFF with the description of ‘Delete’. The survey area contains no assigned features labeled as Existence Doubtful (ED) or Reported (Rep). All other assigned features are portrayed in the FFF. All uncharted features are portrayed in the FFF as surveyed and attributed with the description of ‘New’.One Danger to Navigation (DtoN) report was submitted for this survey. The following DtoN report was submitted: H13060 Danger to Navigation 01 – September 25, 2017 H13060 DtoN 01 reported the USGS Gulfport Monitoring Platform Light being out of position when compared to the charts and USCG Light List. It is currently charted 360 meters to the northwest of its surveyed position. After reporting this DtoN, the Branch Chief of AHB notified the USCG about the charting discrepancy and requested that the Light List be updated to include the correct location of this feature. Correspondence on this matter is included in Appendix II of this report. Both the charts and USCG Light List still depict the incorrect location of the light. On December 22, 2017 DEA reported an uncharted breakwater via email to the Operations Branch and to the Atlantic Hydrographic Branch outside of the regular DtoN reporting process. The email indicated that the Deer Island Breakwater, located outside of the survey area along its northern boundary, was not charted. Charted AtoNs (Deer Island Breakwater Danger Lights) marking the breakwater were damaged with only bare piles remaining. This email report and subsequent correspondence on the matter are included in Appendix II of this report. The charts for the area were updated to include the breakwater on February 22, 2018. The survey vessel ran a single reconnaissance line delineating the breakwater after it was discovered. This line is included in the survey’s bathymetric grids.No channels exist within the survey extents. There are no precautionary areas, traffic separation schemes, or pilot boarding areas within the survey limits. Safety Fairways are charted to the east and west of the survey area. The Gulfport Sound Channel and Biloxi Channel are the designated safety fairways that provide transit to Port of Gulfport and Biloxi Bay, respectively. The safety fairways were outside of the survey area and were not investigated during survey operations. Object Detection MBES requirements were obtained on the designated anchorage located within the sheet boundary, per the coverage requirements stated in the Project Instructions. The Gulfport Middle Reach Inbound Range Rear Light and Range Line, which aid inbound traffic through Ship Island Pass, were outside the assigned survey area and not investigated during survey operations.No bottom samples were required for this survey.Shoreline was not assigned in the Hydrographic Survey Project Instructions or Statement of Work.Other than the previously mentioned junction analyses, no other comparisons with prior surveys were conducted.The USGS Gulfport Monitoring Platform Light was found to be charted out of position by approximately 360 meters. This discrepancy was reported as DtoN 01. The feature, which is discussed in Section D.1.5 of this document, is included in the FFF with description of ‘Retain’ Visual inspection of baring charted features occurred during daylight hours so light function and characteristics were not observed or verified. All other assigned aids to navigation were found to be on station and serving their intended purpose.No overhead features exist for this survey.No submarine features exist for this survey.The USGS Gulfport Monitoring Platform Light was found to be charted out of position by approximately 360 meters. This discrepancy was reported as DtoN 01. The feature, which is discussed in Section D.1.5 of this document, is included in the FFF with description of ‘Retain’.No ferry routes or terminals exist for this survey.No abnormal seafloor and/or environmental conditions exist for this survey.No present or planned construction or dredging exist within the survey limits.No new surveys or further investigations are recommended for this area.No new insets are recommended for this area.As Chief of Party, field operations for this hydrographic survey were conducted under my direct supervision, with frequent personal checks of progress and adequacy. I have reviewed the attached survey data and reports.All field sheets, this Descriptive Report, and all accompanying records and data are approved. All records are forwarded for final review and processing to the Processing Branch.The survey data meets or exceeds requirements as set forth in the NOS Hydrographic Surveys and Specifications Deliverables, Field Procedures Manual, Letter Instructions, and all HSD Technical Directives. These data are adequate to supersede charted data in their common areas. This survey is complete and no additional work is required.Jonathan L. Dasler, PE, PLS, CHNSPS/THSOA Certified Hydrographer, Chief of Party2018-04-13Jason Creech, CHNSPS/THSOA Certified Hydrographer, Charting Manager / Project Manager2018-04-13Kathleen SchachtMBES Data Processing Manager2018-04-13David T. Moehl, PLS, CHNSPS/THSOA Certified Hydrographer, Lead Hydrographer2018-04-13OPR-J348-KR-17 Data Acquisition and Processing Report2018-03-21