OPR-E350-TJ-22 Potomac River Maryland Virginia H13805 Kitts Point to Ragged Point Z 2023-08-08 2023-09-10 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). H13805_MB_1m_MLLW_1of3 Projected UTM 18 North American Datum 1983 Mean Lower Low Water found by multi beam Yes Yes 2.0m (General 1) 10% (General 1) Yes Yes No 1m (Exceptional) N/A 0.15m (Exceptional) 0.75% (Exceptional/Critical) H13805_MB_1m_MLLW_2of3 Projected UTM 18 North American Datum 1983 Mean Lower Low Water found by multi beam Yes Yes 2.0m (General 1) 10% (General 1) Yes No No 1m (Exceptional) N/A 0.15m (Exceptional) 0.75% (Exceptional/Critical) H13805_MB_1m_MLLW_3of3 Projected UTM 18 North American Datum 1983 Mean Lower Low Water found by multi beam No No N/A N/A Yes No No 1m (Exceptional) N/A 0.15m (Exceptional) 0.75% (Exceptional/Critical) 368926108 2903 Positioning and Attitude System Applanix POS MV 320 v5 POS MV 320 v5 3245 2023-07-20 Multibeam Kongsberg Maritime EM 2040 EM2040 40143 300 kHz 2023-07-24 2023-07-24 Side-scan sonar EdgeTech 4200 4200 40423 600 kHz 2023-02-24 2023-02-24 Conductivity, Temperature, and Depth Sensor Sea-Bird Scientific SBE 19plus 19plus 19P36399-4630 N/A 2022-11-16 2023-03-07 Sound Speed System Teledyne RESON SVP 70 SVP 70 1013077 N/A 2019-01-06 2023-03-16 368926109 2904 Positioning and Attitude System Applanix POS MV 320 v5 POS MV 320 v5 8959 2023-07-20 Multibeam Kongsberg Maritime EM 2040 EM2040 40122 300 kHz 2023-07-24 2023-07-24 Side-scan sonar EdgeTech 4200 4200 50508 600 kHz 2023-07-24 2023-07-24 Sound Speed System Teledyne RESON SVP 70 SVP 70 1921073 N/A 2021-02-09 2023-03-16 Conductivity, Temperature, and Depth Sensor Sea-Bird Scientific SBE 19plus 19plus 19P33589-4487 N/A 2022-11-16 2023-03-07 369958000 S222 Positioning and Attitude System Applanix POS MV 320 v5 POS MV 320 v5 6497 2023-03-05 Multibeam Kongsberg Maritime EM 2040 EM2040 40260 300 kHz 2023-03-07 2023-03-16 Conductivity, Temperature, and Depth Sensor Sea-Bird Scientific SBE 19plus V2 19plus 19P60744-6667 N/A 2022-11-17 2023-03-16 Sound Speed System Valeport Thru-Hull SVS 065101 33711 N/A 2022-11-17 2023-03-16 Conductivity, Temperature, and Depth Sensor AML Oceanographic MVP200 MVP200 M12981 N/A 2022-05-04 2022-05-04 Conductivity, Temperature, and Depth Sensor AML Oceanographic MVP-X MVP-X2 9001 N/A 2022-02-08 2022-02-08 Pydro, 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. Vessels S222, 2904, and 2903 collected a combined total of approximately 72.89 linear nautical miles of MBES crosslines, a figure which constitutes about 4% of mainscheme mileage. A Single Resolution (SR) 1m Combined Uncertainty and Bathymetry Estimator (CUBE) surface of mainscheme data and a SR 1m CUBE surface of crossline data were differenced with the Pydro tool Compare Grids. The results of this comparison indicate that over 99.5% 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 0.12m difference, with a standard deviation of 0.08m, verifying the consistency of the data. H13805 crosslines comparison statistics file:///B:/OPR-E350-TJ-23/Surveys/H13805/Metadata/Report%20Components/H13805_1m_MS-H13805_1m_XL_depth_delta_2024.png H13805 crosslines comparison statistics file:///B:/OPR-E350-TJ-23/Surveys/H13805/Metadata/Report%20Components/H13805_1m_MS-H13805_1m_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 22 QC Tools was used to asses grid density, resolution, and uncertainty against allowable standards specified in the most recent edition of the HSSD. This survey was assigned quality metrics of General 1 and one of the delivered grids exceed the specified standards. The uncertainty metrics reported in the Metadata section reflect the highest Quality Metric that was achieved for each grid. H13805 Grid 1 of 2 Uncertainty Statistics file:///B:/OPR-E350-TJ-23/Surveys/H13805/Metadata/Report%20Components/H13805_MB_1m_MLLW_Final_1of2.QAv7.tvu_qc.exc.png H13805 Grid 2 of 2 Uncertainty Statistics file:///B:/OPR-E350-TJ-23/Surveys/H13805/Metadata/Report%20Components/H13805_MB_1m_MLLW_Final_2of2.QAv7.tvu_qc.gn1.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 fliers. In addition, the Pydro tool Flier Finder and the ArcGIS Pro tool ArcFlier (developed by NOAA physical scientist Anthony Klemm) both scan grids for anomalous data and were utilized to guide editing. Designated soundings were selected to ensure that gridded surfaces honor the true depth of the seafloor specifically with regard to the least depths of new and existing charted features. 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 22 QC Tools "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. In areas where 100% bathymetric coverage was not achieved, such as in set line spacing or mixed coverage (MBES and SSS) surveys, the "Holiday Finder" tool is not as useful. The field unit has found that the results of the "Extract Survey Outlines" tool aids in the visual identification of gaps between MBES and SSS coverage. Multiple small holidays exist around the sheet edges due to the field unit reaching the limit of safe navigation as well as operational time constraints. Multiple holidays exist within the sheet limits due to the presence of fishing structures at the time of acquisition. One large holiday exists in the northwest of the sheet due to the presence of a light tower and significant surrounding shoaling. This entire survey is adequate to supersede previous data. The data in this survey was acquired in accordance with requirements set forth in the 2024 HSSD. Side scan sonars (SSS) were used in conjunction with MBES to establish acoustic intensity coverage and for object detection and recognition. After acquisition, the data was visually inspected and any object that was obviously anthropogenic or had a shadow equal or greater than 0.5m was marked as a contact to be later developed with multibeam. SSS mosaics are included in the delivery package. N/A Survey H13805 junctions with contemporary survey H13804 within project OPR-E350-TJ-23. The Pydro 22 tool "Compare Grids" was utilized to assess the overlap of the junction. The result of the comparison indicates that 100% of of grid-node comparisons between the two surfaces are within Fraction of Allowable Error standards for depth/height, 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 0.08m which is within allowable TVU for the area. H13805-H13804 junction statistics file:///B:/OPR-E350-TJ-23/Surveys/H13805/Metadata/Report%20Components/H13805_MB_1m_MLLW_Final-H13804_MB_1m_MLLW_depth_delta_2024.png H13805-H13804 junction statistics file:///B:/OPR-E350-TJ-23/Surveys/H13805/Metadata/Report%20Components/H13805_MB_1m_MLLW_Final-H13804_MB_1m_MLLW_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 velocity is extremely variable in estuarine areas, such as the Potomac River. To compensate for this, casts were conducted at the start of acquisition each day and at a minimum of one every four hours in order to have an appropriate absorption coefficient. Please refer to Section 4.3.2.1.2 Acoustic Backscatter Imagery of the Field Procedures Manual for the backscatter post processing workflow. A minor offset exists between the ship (vessel S222) and launch (vessels 2903 and 2904) data. The cause is unknown and ranges approximately 0.10-0.20m. The offset is within our allowable uncertainty. Troubleshooting steps included inspecting vessel offset and alignment configurations for anomalies, examining positioning data for anomalies, and recreating and reapplying SBETs, none of which solved the offset. Two bathymetric grids have been listed in this report: a set line spacing grid and a 100% bathymetric coverage grid. These two were extracted from a parent surface using geometry. The shapefile used for this process is included in the bathymetric grids folder with the submission package. Trained Marine Mammal Observers list 2023-03-20 Final Survey Outline 2023-09-18 NCEI Sound Speed Data 2023-09-13 Potentially Sensitive Data Findings 2023-09-26 Dangers to Navigation Report 2023-08-29 Dangers to Navigation Report 2024-05-15 Coast Pilot Report 2024-05-22 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. CAPT Matthew Jaskoski, NOAA Commanding Officer