OPR-G380-TJ-24 Approaches to Charleston South Carolina H13982 13NM SE of Charleston Entrance -0400 2024-08-14 2024-10-08 DOC/NOAA/NOS/OCS -- Office of Coast Survey hsd.chief@noaa.gov NOAA Ship Thomas Jefferson (S222) CC0-1.0 (NOAA Field Units) CC0-1.0 https://creativecommons.org/publicdomain/zero/1.0/ https://creativecommons.org/publicdomain/zero/1.0/legalcode These data were produced by NOAA and are in the public domain within the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0). H13982_MB_1m_MLLW_1of1 Projected UTM 17 North American Datum 1983 (2011) Mean Lower Low Water found by multi beam Yes Yes 2.0m (General 1) 10% (General 1) Yes Yes No 1m (Exceptional) N/A 0.25m (Critical) 0.75% (Exceptional/Critical) 369958000 S222 Positioning and Attitude System Applanix POS MV 320 v5 POS MV 6497 2024-06-05 Positioning and Attitude System Applanix POS MV 320 v5 POS MV 8959 2024-04-01 Multibeam Kongsberg Maritime EM 2040 EM 2040 40122 kHz 2024-03-27 2024-04-04 Conductivity, Temperature, and Depth Sensor AML Oceanographic MVP200 M12981 NA NA 2024-04-01 Conductivity, Temperature, and Depth Sensor AML Oceanographic MVP-X MVP-X CTD 9006 NA 2024-02-08 2024-04-01 Sound Speed System Teledyne RESON SVP 70 SVP 70 1013077 NA 2024-01-09 Sound Speed System Teledyne RESON SVP 70 SVP 70 0614179 NA 2023-10-23 Pydro 24, a suite of software maintained by NOAA's Hydrographic Systems and Technology Branch (HSTB), contains various tools that aid in the analysis and quality control of hydrographic data. A Single Resolution (SR) 1m Combined Uncertainty and Bathymetry Estimator (CUBE) surface of this survey's mainscheme data and a SR 1m CUBE surface of this survey's crossline data were differenced with the Pydro 24 tool "Compare Grids." The results of this comparison indicate that 100% of grid-node comparisons between the two surfaces are within the Fraction of Allowable Error for depth/height, exceeding the specification of 95% stipulated by NOAA's 2024 Hydrographic Surveys Specifications and Deliverables (HSSD). The resulting mean of this comparison was a 0.02m difference, with a standard deviation of 0.05m, verifying the consistency of the data. Vessel S222 collected a total of approximately 71.69 linear nautical miles of MBES crosslines, a figure which constitutes about 6.75% of mainscheme mileage. A statistical summary of the comparison between H13982 crossline and maincheme data. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/crossline_comparison/H13982_MB_1m_MLLW_MS-H13982_MB_1m_MLLW_XL_depth_delta_2024.png A statistical summary of the comparison between H13982 crossline and maincheme data. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/crossline_comparison/H13982_MB_1m_MLLW_MS-H13982_MB_1m_MLLW_XL_fracAllowErr_vsDepth_Overview.png Statistical analysis of grid layers was conducted to assess the quality of the bathymetry. The "Grid QC" program contained within NOAA's Pydro 24 QC Tools was used to asses grid density and uncertainty against allowable standards specified in the most recent edition of the HSSD. This survey was assigned quality metrics of "General 1," and the delivered grids exceed the specified standards up to "Critical"quality metrics. Information about uncertainty values used for data processing can be found within the Caris HIPS & SIPS processing project and in the associated Hydrographic Vessel Files (HVFs) for each survey platform. H13982 Uncertainty Statistics - Gemeral-1 file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/grid_qa/H13982_MB_1m_MLLW_Final_1of1.QAv7.tvu_qc.gn1.png H13982 Density Statistics file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/grid_qa/H13982_MB_1m_MLLW_Final_1of1.QAv7.density.png H13982 Uncertainty Statistics - Critical file:///Q:/OPR-G380-TJ-24/Surveys/H13982/01_HDR/Working/HDR_QC_Outputs/TL_QC/H13982/H13982_MB_1m_MLLW_1of1.QAv7.tvu_qc.cri.png After initial collection, MBES data underwent a thorough process of editing and inspection to clean gridded surfaces of erroneous fliers that inaccurately affected seabed measurements, and to ensure that no systematic errors were present. Teledyne's CARIS software was used to generate and examine a 1m CUBE surface as well as its uncertainty, and standard deviation layers, which guided visual inspection for flyers. In addition, the Pydro 24 tool "Flier Finder" analyzes the grids for anomalous data and was utilized to guide editing. Survey coverage was assessed daily by the field unit as part of night processing to identify data gaps to be addressed. Gaps in coverage that are larger than HSSD specifications are known as holidays. Various methods were utilized to aid in holiday identification including visual inspection and NOAA's Pydro 24 QC Tools program "Holiday Finder". "Holiday Finder" is most commonly used for holiday identification in areas of 100% bathymetric (MBES) coverage. The hydrographer inputs a CUBE surface and the tool returns a number of files which can be used in Caris HIPS & SIPS for holiday analysis and acquisition planning. There is one holiday present in the mainscheme coverage of sheet H13982, which the field unit was unable to address due to the location being in close proximity of a buoy. This survey is adequate to supersede previous data; however, there exists a gap in data due to a holiday as described above. The data in this survey was acquired in accordance with requirements set forth in the 2024 HSSD. Imagery coverage assessment was not performed for this survey Data interpolation was not performed for this survey Survey H13982 junctions with prior surveys H12805, H13766 and H13779. The Pydro 24 tool "Compare Grids" was utilized to assess the overlap of each junction. The results of a comparison between a 1m SR surface of survey H13982 and surface H12805 (1 of 4) indicate that 99.92% of grid-node comparisons between these surfaces are within Fraction of Allowable Error standards for depth/height for the assigned quality metric of "General 1," exceeding the specification of 95% stipulated by NOAA's 2024 HSSD. The resulting mean of this comparison was a -0.09m difference, with a standard deviation of 0.20m which is within allowable TVU for the area. The results of a comparison between a 1m SR surface of survey H13982 and surface H12805 (2 of 4) indicate that 99.90% of grid-node comparisons between these surfaces are within Fraction of Allowable Error standards for depth/height for the assigned quality metric of "General 1," exceeding the specification of 95% stipulated by NOAA's 2024 HSSD. The resulting mean of this comparison was a 0.06m difference, with a standard deviation of 0.20m which is within allowable TVU for the area. The results of a comparison between a 1m SR surface of survey H13982 and surface H12805 (3 of 4) indicate that 99.97% of grid-node comparisons between these surfaces are within Fraction of Allowable Error standards for depth/height for the assigned quality metric of "General 1," exceeding the specification of 95% stipulated by NOAA's 2024 HSSD. The resulting mean of this comparison was a -0.06m difference, with a standard deviation of 0.20m which is within allowable TVU for the area. The results of a comparison between a 1m SR surface of survey H13982 and surface H12805 (4 of 4) indicate that 99.99% of grid-node comparisons between these surfaces are within Fraction of Allowable Error standards for depth/height for the assigned quality metric of "General 1," exceeding the specification of 95% stipulated by NOAA's 2024 HSSD. The resulting mean of this comparison was a 0.01m difference, with a standard deviation of 0.17m which is within allowable TVU for the area. A stats/distribution summary plot between H13982 and H12805 (1 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_50cm_MLLW_1of4_depth_delta_2024.png A plot of Node Depth vs. Allowable Error Fraction for the comparison between H13982 and H12805 (1 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_50cm_MLLW_1of4_fracAllowErr_vsDepth_Overview.png A stats/distribution summary plot between H13982 and H12805 (2 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_50cm_MLLW_2of4_depth_delta_2024.png A plot of Node Depth vs. Allowable Error Fraction for the comparison between H13982 and H12805 (2 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_50cm_MLLW_2of4_fracAllowErr_vsDepth_Overview.png A stats/distribution summary plot between H13982 and H12805 (3 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_1m_MLLW_3of4_depth_delta_2024.png A plot of Node Depth vs. Allowable Error Fraction for the comparison between H13982 and H12805 (3 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_1m_MLLW_3of4_fracAllowErr_vsDepth_Overview.png A stats/distribution summary plot between H13982 and H12805 (4 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_1m_MLLW_4of4_depth_delta_2024.png A plot of Node Depth vs. Allowable Error Fraction for the comparison between H13982 and H12805 (4 of 4) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12805/H13982_MB_1m_MLLW_Final_1of1-H12805_MB_1m_MLLW_4of4_fracAllowErr_vsDepth_Overview.png The results of a comparison between a 1m SR surface of survey H13982 and surface H12766 indicate that 96.77% of grid-node comparisons between these surfaces are within Fraction of Allowable Error standards for depth/height for the assigned quality metric of "General 1," exceeding the specification of 95% stipulated by NOAA's 2024 HSSD. The resulting mean of this comparison was a -0.02m difference, with a standard deviation of 0.37m which is within allowable TVU for the area. A stats/distribution summary plot between H13982 and H12766 mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12766/H13982_MB_1m_MLLW_Final_1of1-H12766_MB_1m_MLLW_1of1_depth_delta_2024.png A plot of Node Depth vs. Allowable Error Fraction for the comparison between H13982 and H12766 mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12766/H13982_MB_1m_MLLW_Final_1of1-H12766_MB_1m_MLLW_1of1_fracAllowErr_vsDepth_Overview.png The results of a comparison between a 1m SR surface of survey H13982 and surface H12779 (1 of 3) indicate that 93.72% of grid-node comparisons between these surfaces are within Fraction of Allowable Error standards for depth/height for the assigned quality metric of "General 1," not exceeding the specification of 95% stipulated by NOAA's 2024 HSSD. The resulting mean of this comparison was a -0.10m difference, with a standard deviation of 0.44m. The results of a comparison between a 1m SR surface of survey H13982 and surface H12779 (3 of 3) indicate that 93.80% of grid-node comparisons between these surfaces are within Fraction of Allowable Error standards for depth/height for the assigned quality metric of "General 1," not exceeding the specification of 95% stipulated by NOAA's 2024 HSSD. The resulting mean of this comparison was a -0.07m difference, with a standard deviation of 0.38m. A stats/distribution summary plot between H13982 and H12779 (1 of 3) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12779/H13982_MB_1m_MLLW_Final_1of1-H12779_MB_50cm_MLLW_1of3_depth_delta_2024.png A plot of Node Depth vs. Allowable Error Fraction for the comparison between H13982 and H12779 (1 of 3) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12779/H13982_MB_1m_MLLW_Final_1of1-H12779_MB_50cm_MLLW_1of3_fracAllowErr_vsDepth_Overview.png A stats/distribution summary plot between H13982 and H12779 (3 of 3) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12779/H13982_MB_1m_MLLW_Final_1of1-H12779_MB_1m_MLLW_3of3_depth_delta_2024.png A plot of Node Depth vs. Allowable Error Fraction for the comparison between H13982 and H12779 (3 of 3) mainscheme. file:///Q:/OPR-G380-TJ-24/Surveys/H13982/Metadata/QC/junction_comparison/H12779/H13982_MB_1m_MLLW_Final_1of1-H12779_MB_1m_MLLW_3of3_fracAllowErr_vsDepth_Overview.png N/A The system echo sounders have the dynamic range to accommodate the relatively homogeneous survey area. The frequency was held constant at 300 kHz while the system automatically controlled pulse type. No special techniques were used outside of normal considerations for quality data acquisition for a bathymetric survey. Sound speed profiles were collected at the start of acquisition each day and at a minimum of once every four hours in order to apply appropriate absorption coefficients during acquisition. Please refer to Section 4.3.2.1.2 Acoustic Backscatter Imagery of the Field Procedures Manual for the backscatter post processing workflow. Information about uncertainty values used for data processing can be found within the Caris HIPS & SIPS processing project and in the associated Hydrographic Vessel Files (HVFs) for each survey platform. Uncertainty results for H13982 can be found in the Statistical Analysis section of Quality Control Procedures in this document. Unusual IMU dropouts and vertical offset issues were encountered on this survey. In an effort to troubleshoot, the POS computer system (PCS POS MC320 v5) was replaced (DN261 – 09/17/24) and a subsequent patch test was conducted to update the HIPS Vessel File (hvf). As S222 continued to encounter issues, the POS Inertial Measurement Unit (IMU) was replaced (DN272 - 09/28/24) alongside a new patch test and updated hvf. Any affected lines were either updated or reacquired and processed with the newest hvf - and no significant offsets persist. Coast Pilot Report 2024-11-06 Trained Marine Mammal Observers list 2024-03-05 NCEI Sound Speed Data 2024-11-04 Final Survey Outline 2024-10-09 Potentially Sensitive Data Findings 2024-10-09 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 and approved all data and metadata. The survey meets or exceeds requirements as set forth in the Project Instructions and NOS Hydrographic Surveys Specifications and Deliverables. The survey is complete and no additional work is required with the exception of any deficiencies noted in the Report of Survey. CDR Megan R. Guberski Chief of Party Benjamin M. Bryan Senior Survey Technician