SAR: The surfaces were replaced in review with a single VR surface created using the Object Detection criteria for the Ranges gridding algorithm. The field unit showed the two submitted surface passed required densities in the relevant areas, so delivering a single surface downstream keeps things simplified later. The new single surface has a depth range of 0.2m to 276.4m and follows standard naming conventions. SAR: One designated sounding was added to the data to represent the least depth on an OBSTRN found in review.Variable ResolutionF00776_MB_VR_CC_MLLWNOAA_VRComplete MBESCARIS VR Surface (CUBE)1.11278.51Variable ResolutionF00776_MB_VR_OD_MLLWNOAA_VRObject DetectionCARIS VR Surface (CUBE)0.2272.18Variable ResolutionF00776_MB_VR_OD_MLLW_FinalNOAA_VRObject DetectionCARIS VR Surface (CUBE)0.2272.18Variable ResolutionF00776_MB_VR_CC_MLLW_FinalNOAA_VRComplete MBESCARIS VR Surface (CUBE)1.11278.51Submitted surfaces were generated using the recommended parameters for depth-based (Ranges) Caris variable-resolution bathymetric grids as specified in HSSD 2019. Pydro QC Tools "Detect Fliers" program with object detection settings was used to identify fliers in the data; obvious noise was rejected. Upon completion of multiple iterations of this process, Detect Fliers was run again, resulting in no fliers remaining. Results from Pydro QC tools are included in the Separates section of this report. No soundings were designated for this survey.NOAA Profile Version 2019QPSFledermaus Geocoder Tool Box (FMGT)7.8.1CARISHIPS and SIPS11.1Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR.No crosslines were acquired for this survey.All equipment and survey methods were used as detailed in the DAPR.SBES DeficiencySee section B.1 for discussion covering SBES deficiency.SupportFiles\Sound_Speed_Cast_Locations.PNGF00776 sound speed cast locations.Thirteen sound speed profiles were acquired for this survey at discrete locations within the survey area at least once every four hours, when significant changes to surface sound speed were observed, or when operating in a new area. Sound speed profiles were acquired using Sea-Bird Scientific SBE 19plus profilers. All casts were concatenated into a master file and applied using the "Nearest in distance within time (4 hours)" profile selection method.F006835000WNOAA Ship RAINIER2016SupportFiles\F00776_Junction_Analysis.PNGF00776 junction area. Failed - low and failed - high nodes are shown in cool blue/ hot red, yellow, and orange; those nodes meeting uncertainty standards are shown in green.SupportFiles\F00776_MB_8m_MLLW_Final-F00683_MB_8m_MLLW_4of5_depth_delta.pngPydro derived plot showing F00776/F00683 8m surface comparison statistics.SupportFiles\F00776_MB_8m_MLLW_Final-F00683_MB_8m_MLLW_4of5_fracAllowErr_Freq.pngPydro derived plot showing F00776/F00683 8m surface comparison statistics. SupportFiles\F00776_MB_16m_MLLW_Final-F00683_MB_16m_MLLW_5of5_depth_delta.pngPydro derived plot showing F00776/F00683 16m surface comparison statistics. SupportFiles\F00776_MB_16m_MLLW_Final-F00683_MB_16m_MLLW_5of5_fracAllowErr_Freq.pngPydro derived plot showing F00776/F00683 16m surface comparison statistics. SupportFiles\F00776_Old_Coverage.PNGF00683 coverage of new breakwater.SupportFiles\F00776_New_Coverage.PNGF00776 new coverage showing lack of coverage over new breakwater.The junction with survey F00683 encompassed 2.94 square nautical miles and is situated completely within prior F00683 coverage with the exception of prior coverage which existed where the new breakwater is now situated. A comparison was made with the Pydro Explorer "Compare Grids" function using two Caris single-resolution surfaces from F00776 (8m and 16m) as well as two single-resolution BAG surfaces of corresponding resolutions from survey F00683. These two resolutions were chosen as they were the best representation of the overall survey junction. The results are shown in the figures below. Additionally, the Compare Grids function creates a difference surface, from which statistics were derived. The computed statistics indicated the average difference in depth between F00776 and F00683 was 0.18 meters with a standard deviation of 0.84 meters for the 8 meter surface and 0.08 meters with a standard deviation of 0.97 meters for the 16 meter surface. Localized areas of disagreement, include the shoreward side of the new breakwater, the northeastern portion of coverage, and the delta at the mouth of Fourth of July Creek. These areas of non-compliance are illustrated in the image below. SupportFiles\F00776_Junction_Overview.PNGF00776 / F00683 junction.00.0335ERS via ERTDM3N/A0.0528013N/A0.0528033N/AN/A2701SupportFiles\F00776_MB_VR_MLLW_Final.QAv5.tvu_qc.pngPydro derived plot showing TVU compliance of F00776 finalized variable-resolution MBES grid data.Total Propagated Uncertainty (TPU) values for survey F00776 were derived from a combination of fixed values for equipment and vessel characteristics, as well as from field assigned values for sound speed uncertainties. The Elipsoidally Referenced Tidal Datum Model (ERTDM) uncertainty value entered for tide zoning TPU calculation was 0.0335 meters; it was determined using an MS Excel ERTDM calculator based on a method for estimating ERDTM SEP uncertainty developed by Jack Riley using  the 1km ERZT SEP. (See Supplemental Survey Records & Correspondence for more info). In addition to the usual a priori estimates of uncertainty, some real-time and post-processed uncertainty sources were also incorporated into the depth estimates of this survey. Real-time uncertainties from Kongsberg MBES sonars were recorded and applied in post-processing. Applanix TrueHeave (POS) files, which record estimates of heave uncertainty, were applied during post-processing. Finally, the post-processed uncertainties associated with vessel roll, pitch, yaw and position were applied in Caris HIPS using SBET and RMS files generated using POSPac MMS software. Uncertainty values of the submitted finalized grid was calculated in Caris using "Greater of the Two" of uncertainty and standard deviation (scaled to 95%). Grid QA within Pydro QC Tools V5 was used to analyze F00776 TVU compliance, a histogram plot of the results is shown below.SupportFiles\Sound_Speed_Full_Screen.PNGSubset view of MBES lines showing disagreement between overlapping outer-beams.Suboptimal Sound Speed CorrectionSignificant fresh water inflow and water column variations, especially related to temperature and salinity differences, were sometimes encountered during the survey. Despite the best efforts of the Hydrographers to conduct sufficient sound speed casts, sound speed correction was suboptimal. This was evidenced by the appearance of systematic artifacts in the survey grid and by the characteristic "smiles" or "frowns" of the data when viewed in subset editor. To address this issue, the Hydrographer rejected outer-beam soundings obviously in error in an attempt to produce a surface that best represented the sea floor.SupportFiles\F00776_Vertical_Offset.PNGExample of vertical offset issue.Survey Line Vertical OffsetVertical offsets within multibeam coverage of approximately 0.5 meters exist in shallow portions of the survey area. After a thorough review of the survey methods used, no cause(s) could be found to explain this issue.SupportFiles\2803_RA3.jpgSurvey launch 2803 (RA-3).SupportFiles\2701_RA2.jpgShoreline verification boat 2701 (RA-2).1.18.828011.18.828030.477.62701All MBES data for F00776 were acquired by NOAA Ship RAINIER survey launches 2801 and 2803. The vessels acquired depth soundings, backscatter imagery, and sound speed profiles. Shoreline feature verification was conducted by Rainier jet boat 2701. This vessel also acquired SBES data, which were used for reconaissance in order to establish an inshore boundary of MBES acquisition. Subsequent MBES coverage superceded these data for NALL determination. The SBES data are included with this survey, but due to the low quality of the data, it was not incorporated into any other products being delivered with this report. A comparison was made with the Pydro Explorer "Compare Grids" function using a 4m SBES finalized surface and a 4m MBES finalized surface. The results are shown in the figures below. The computed statistics indicated the average difference in depth between F00776 MBES and SBES was 22.59 meters with a standard deviation of 55.07 meters. Positioning and Attitude SystemApplanixPOS MV 320 v5MBESKongsberg MaritimeEM 2040Conductivity, Temperature, and Depth SensorSea-Bird ScientificSBE 19plusSound Speed SystemTeledyne RESONSVP 70SBESTeledyne Odom HydrographicEchotrac CV200Lidar SystemVelodyne LiDARVLP-16SupportFiles\F00776_MB_4m_MLLW_Final-F00776_SB_4M_Final_depth_delta.pngPydro derived plot showing F00776 MBES/SBES surface comparison statistics.SupportFiles\F00776_MB_4m_MLLW_Final-F00776_SB_4M_Final_fracAllowErr_Freq.pngPydro derived plot showing F00776 MBES/SBES surface comparison statistics.Refer to the Data Acquisition and Processing Report (DAPR) for a complete description of data acquisition and processing systems, survey vessels, quality control procedures and data processing methods. Additional information to supplement sounding and survey data, and any deviations from the DAPR are discussed in the following sections.SupportFiles\F00776_Backscatter.PNGOverview of F00776 backscatter mosaics (Chart 16682).Raw backscatter data were acquired as .all files logged during MBES operations and subsequently processed by personnel aboard RAINIER. The .GSF files created during processing and one backscatter mosaic per vessel per frequency have been delivered with this report. Backscatter processing procedures utilized followed those detailed in the DAPR.All data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Benjamin K. Evans, CAPT/NOAAChief of Party2019-10-07Hadley A. Owen, LT/NOAAField Operations Officer2019-10-07James B. JacobsonChief Survey Technician2019-10-07Carl R. StedmanSheet Manager2019-10-07As 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 Specifications and 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 with the exception of deficiencies noted in the Descriptive Report.North American Datum 1983Projected UTM 6SBET Processing MethodPrecise Positioning-Real Time Extended (PP-RTX) processing methods were used in Applanix POSPac MMS 8.2.1 software to produce SBETs for post-processing horizontal correction.Mean Lower Low WaterERS via ERTDMSeward_Shipyard_ERDTM_NAD83-MLLW.csarAdditional information discussing the vertical or horizontal control for this survey can be found in the accompanying DAPR.No abnormal seafloor and/or environmental conditions exist for this survey.This project is recommended to be used to create an inset adjoining chart 16882.No bottom samples were required for this survey.No new surveys or further investigations are recommended for this area.No platforms exist for this survey.No Maritime Boundary Points were assigned for this survey.SupportFiles\F00776_Submarine_Features.PNGDepiction of submarine cables within the F00776 survey area.Three submarine cables exist within the survey area. These cables were not seen in the MBES data.No present or planned construction or dredging exist within the survey limits.No ferry routes or terminals exist for this survey.A third new ATON (square, green day beacon) was submitted, and unlike the two already mentioned, was not found on the Light List. SupportFiles\F00776_FFF_New_Beacons.PNGNew channel beacons added to Final Feature File (Chart 16682).Two new green channel markers at the entrance to JAG Shipyard were positioned during shoreline investigation and were added to the Final Feature File. These channel markers are listed in the 2019 U.S. Coast Guard Light List Volume VI and are listed as private aids. All aids to navigation were on station and serving their intended purposes.No overhead features exist for this survey.See section D.2.1 for further information.2019-04-0181436US4AK2GM2018-05-14112019-04-0181847US4AK2FM2018-09-1419A potentially significant change can be found in the southern extent of the surveyed shipyard. Survey MBES found an OBSTRN feature, standing 4m proud of the sea floor, to a least depth of 4.2m within the proximity of the JAG Alaska dry dock. file:///M:/OPRP136RA19/Surveys/F00776/Office_Processing/Review_office/Working/SAR/new_OBSTRN.pngMBES of OBSTRNfile:///M:/OPRP136RA19/Surveys/F00776/Office_Processing/Review_office/Working/SAR/new_OBSTRN_MORFAC.pngMBES of OBSTRN and surroundings, with Charted MORFAC dolphin in greyA comparison was made between F00776 survey data and Electronic Navigation Charts (ENC) US4AK2GM and US4AK2FM using CUBE surfaces, selected soundings, and contours created in Caris. Both charts were required to gain coverage of the entire survey area.No channels exist for this survey. There are no designated anchorages, precautionary areas, safety fairways, traffic separation schemes, pilot boarding areas, or channel and range lines within the survey limits. See Final Feature File for more information.No shoals or potentially hazardous features exist for this survey.OPR-P136-RA-19East Coast of Kodiak Island, AlaskaResurrection Bay, AlaskaNOAA Ship Rainier (S221)Multibeam Echo Sounder BackscatterMultibeam Echo SounderBenjamin K. Evans, CAPT/NOAA2019Pacific Hydrographic BranchUTC 6NNavigable Area2019-05-28metersAny revisions to the Descriptive Report (DR) applied during office processing are shown in red italic text. The DR is maintained as a field unit product, therefore all information and recommendations within this report are considered preliminary unless otherwise noted. The final disposition of survey data is represented in the NOAA nautical chart products. All pertinent records for this survey are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via https://www.ncei.noaa.gov/. Products created during office processing were generated in NAD83 UTM 6N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit.2019-06-052019-05-2710United StatesF00776Alaska10000JAG Shipyard, Seward, AlaskaNOAA149.41755555660.09825149.34298611160.0691394444SupportFiles\F00776_Assigned_Survey_Area.PNGF00776 survey area (Chart 16682).This survey area is referred to as F00776, "JAG Shipyard and Vicinity". The survey area encompasses 2.94 square nautical miles of northeastern Resurrection Bay and the Seward Shipyard.Major recent changes to the Seward Marine Industrial Center (JAG Alaska, Inc. Shipyard) located in Resurrection Bay near Seward, Alaska, including a new breakwater structure and accompanying channel markers, necessitate the need for updated hydrographic survey data of the area. Contemporary data are required to support a new large-scale inset to National Ocean Service (NOS) charting products of the shipyard facility and its approach.Data were acquired within the survey limits as described above and to specifications as determined by the HSSD, unless otherwise noted in this report. No sheet limits were assigned for this survey. NOAA Ship RAINIER initially surveyed the Seward Marine Industrial Center basin to ensure safe transit to the JAG Shipyard pier for emergency repairs. After consultation with the Alaska Navigation Manager, this area was expanded to include the adjacent area of Resurrection Bay to support a planned large scale ENC.SupportFiles\F00776_Survey_Coverage.PNGF00776 survey coverage (Chart 16682).SupportFiles\F00776_MB_VR_MLLW_Harbor_Final.QAv5.density.pngPydro derived plot showing HSSD data density compliance of harbor area F00776 finalized variable-resolution MBES data.SupportFiles\F00776_MB_VR_MLLW_Harbor_Final.QAv5.pct_res.obj_det.pngPydro derived plot showing HSSD data coverage compliance of harbor area F00776 finalized variable-resolution MBES data. SupportFiles\F00776_MB_VR_MLLW_Offshore_Final.QAv5.density.pngPydro derived plot showing HSSD data density compliance of offshore area F00776 finalized variable-resolution MBES data. SupportFiles\F00776_MB_VR_MLLW_Offshore_Final.QAv5.pct_res.full_cov.pngPydro derived plot showing HSSD data coverage compliance of offshore area F00776 finalized variable-resolution MBES data. The entire survey is adequate to supersede previous data.Multibeam data for this survey were acquired and processed using object detection settings. Sonar frequency and pulse length were adjusted to correspond with changing water depths. Pydro QC Tools Grid QA V5 was used to analyze F00776 multibeam echosounder (MBES) data density. The offshore portion was analyzed using complete coverage settings whereas the basin and inshore portion of the survey area was analyzed using object detection settings. The submitted F00776 finalized variable-resolution (VR) surface met the density requirement as well as the object resolution requirement. See section A.4 Survey Coverage section for more information. 014.5200000002801010.8900000002803000005.3300027010000005.33025.4102019-05-272019-05-302019-05-312019-06-032019-06-052.943000Object Detection Coverage (Refer to HSSD Section 5.2.2.2)All waters in survey areaSAR: A single Object Detection VR surface was created and archived during office review.SupportFiles\F00776_NALL_Coverage.PNGF00776 coverage and NALL determination (Chart 16682).SupportFiles\F00776_Holiday_Overlap.PNGF00776 holiday due to poor data acquisition overlap.SupportFiles\F00776_Outerbeam_Holidays.pngF00776 holidays due to low outer beam density.This survey is intended to produce an inset to the adjoining chart 16682. The shipyard harbor data were acquired and processed with object detection settings, whereas the data outside of the harbor were acquired and processed with complete coverage settings. Complete multibeam echosounder (MBES) coverage was acquired to the inshore limit of hydrography or the Navigable Area Limit Line (NALL) with the exception of the areas depicted in the figure below. The NALL is defined as the most seaward of the following: the surveyed 3.5-meter depth contour, the line defined by the distance seaward from observed MHW line which is equivalent to 0.8 millimeters at chart scale, or the inshore limit of safe navigation. The Pydro "Detect Holidays" program was used to scan for holidays. Three holidays were detected using the "object detection" setting. No holidays were detected when using the "complete coverage" setting. One of the holidays appears to be due to lack of overlap during data acquisition and the remaining 2 holidays appear to be the result of outer beam density issues due to a relatively sharp course change made by the acquiring vessel during acquisition. Total coverage as well as these holidays are depicted in the images below.