S22070.44.828058.61.128078.61.128088.61.1EM 710MBESKongsberg MaritimeEM 2040MBESKongsberg MaritimePOS MV 320 v5Positioning and Attitude SystemApplanixMVP200Conductivity, Temperature, and Depth SensorAML OceanographicSVP 71Sound Speed SystemTeledyne RESONSVP 70Sound Speed SystemTeledyne RESONSBE 19plus V2Conductivity, Temperature, and Depth SensorSea-Bird ScientificThe equipment was installed on the survey platform as follows: S220 utilizes the Kongsberg EM710, Teledyne Reason SVP 70 surface sound speed sensors, and AML Oceanographic MVP 200 for conductivity, temperature, and depth (CTD) casts. All launches utilize Kongsberg EM 2040 MBES, Teledyne SVP 71 surface sound speed sensors, and Sea-Bird Scientific 19plus CTD casts. All MBES survey vessels are equipped with POS MV v5 systems for positioning and attitude.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.Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR.The surface was analyzed using HydrOffice QC Tools Grid QA feature to determine compliance with specifications. Overall 99.5% of nodes within the surface meet NOAA Allowable Uncertainty specifications for H13108. For a graphical representation of compliance with uncertainty standards see Figure 12.H13108 compliance with uncertainty standardsSupportFiles\H13108_Uncertainty.pngNOAA Allowable UncertaintyThe surface was analyzed using HydrOffice QC Tools Grid QA feature to determine compliance with specifications. Density requirements for H13108 were achieved with at least 99.5% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.4. For a graphical representation of compliance with density requirements see Figure 13. H13108 compliance with density requirementsSupportFiles\H13108_Density.pngDensity H13108 data were reviewed in CARIS HIPS and SIPS for holidays in accordance with Section 5.2.2.3 of the HSSD. Four holidays which meet the 3 by 3 node definition were identified via HydrOffice QC Tools Holiday Finder tool. This tool automatically scans the surface for holidays as defined in the HSSD and was run in conjunction with a visual inspection of the surface by the hydrographer. Upon investigation it was determined that one of the four holidays flagged resulted from a hole in the data caused by Ugak Island; as a result only three holidays were determined to exist (see Figure 14). Holidays #1 and #2 were caused by a lack of overlap between lines. Holiday #3 resulted from rapid shoaling of the outer beams due to a dynamic seafloor. Attempts were made to cover all gaps in coverage when it was safe to do so. However, due to weather conditions vessels were unable to return to the area to collect holiday coverage. All holidays were investigated by the hydrographer in CARIS subset editor where it was determined they did not pose a significant threat to navigation either by the general nature of the seafloor or the surrounding water depth.H13108 numbered holiday locationsSupportFiles\H13108_Holidays.pngHolidaysAll equipment and survey methods were used as detailed in the DAPR.There were no conditions or deficiencies that affected equipment operational effectiveness.None ExistCasts were conducted at a minimum of one every four hours during launch acquisition. Casts were conducted more frequently in areas where there was a change in surface sound speed greater than two meters per second. MVP casts on S220 were conducted at an average interval of 40 minutes, guided by observation of the surface sound speed and targeted to deeper areas. All sound speed methods were used as detailed in the DAPRH13108 junctions with one adjacent survey from this project, H13107, and one survey from a prior project, H13106 as shown in Figure 6. Data overlap between H13108 and each adjacent survey was achieved. These areas of overlap between surveys were reviewed in CARIS HIPS and SIP by surface differencing (at equal resolutions) to assess surface agreement. The multibeam data were also examined in CARIS Subset Editor for consistency and agreement. The junctions with H13108 are generally within the NOAA allowable uncertainty in their areas of overlap. For all junctions with H13108 a negative difference indicates H13108 was shoaler and a positive difference indicates H13108 was deeper. Overview of H13108 junction surveysSupportFiles\H13108_Junction overview.pngSurface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the surface from H13108 and the surface from H13106 (Figure 7). The statistical analysis of the difference surface shows a mean of -0.15 meters with 95% of the nodes having a maximum deviation of +/-0.51 meters as seen in Figure 8. It was found that 98% of nodes are within NOAA allowable uncertainty.16m Difference surface between H13108 (pink) and junctioning survey H13106 (purple)SupportFiles\H13108_H13106_Junction.pngDifference surface statistics between H13108 and H13106 SupportFiles\H13108_H13106 Surface Difference.pngNENOAA Ship RAINIER40000H131062019Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the surface from H13108 and the surface from H13107 (Figure 9). The statistical analysis of the difference surface shows a mean of 0.04 meters with 95% of the nodes having a mazimum deviation of +/-0.26 meters as seen in Figure 10. It was found that 99.5% of nodes are within NOAA allowable uncertainty.VR Difference surface between H13108 (pink) and junctioning survey H13107 (green)SupportFiles\H13108_H13107_Junction.pngDifference surface statistics between H13108 and H13107 SupportFiles\H13108_H13107 Surface Difference.pngSENOAA Ship FAIRWEATHER40000H131072019Crosslines were collected, processed and compared in accordance with Section 5.2.4.2 of the HSSD. To evaluate crosslines, a surface generated via data strictly from mainscheme lines and a surface generated via data strictly from crosslines were created. From these two surfaces a difference surface (mainscheme-crosslines=difference surface) was generated (Figure 4), and is submitted in the Separates II Digital Data folder. Statistics show the mean difference between depth derived from mainscheme data and crossline data was -0.02 (with mainscheme being shoaler) and 95% of nodes falling within +/- 0.19 meters (Figure 5). For the respective depths the difference surface was compared to the allowable NOAA uncertainty standards. In total, 99.5% of the depth differences between H13108 mainscheme and crossline data were within allowable NOAA uncertainties.VR surface difference between crosslines and manscheme on H13108SupportFiles\H13108_Crossline Comparison.pngH13108 crossline and mainscheme difference statisticsSupportFiles\H13108_MAINSCHEME_XL_Stats.pngData collected on day number 206 by launch 2807 exhibited a slight vertical offset caused by the vessel crabbing due to a strong tidal current in the area (Figure 11). However the offset was investigated by the hydrographer and was determined to be within allowable Total Vertical Uncertainty. Vertical offset in H13108 cause by strong tidal current near the islandSupportFiles\H13108_Tidal_Current_Offset.pngTidal currentIn addition to the usual a priori estimates of uncertainty via device models for vessel motion and ERTDM, real-time and post processed uncertainty were also incorporated into the depth estimates of survey H13108. Real-time uncertainties were provided via EM2040 and EM710 data and Applanix Delayed Heave RMS. Following post-processing of the real-time vessel motion, recomputed uncertainties of vessel roll, pitch, gyro, and navigation were applied in CARIS HIPS and SIPS via Smoothed Best Estimate of Trajectory (SBET) RMS file generated in Applanix POSPac.ERS via ERTDM0.150280x (all launches)0.51S2200.52CARIS VR Surface (CUBE)H13108_MB_VR_MLLW96.61.6Complete MBESNOAA_VRVariable ResolutionCARIS VR Surface (CUBE)H13108_MB_VR_MLLW_Final96.61.6Complete MBESNOAA_VRVariable ResolutionThe NOAA CUBE parameters defined in the HSSD were used for the creation of all CUBE surfaces for H13108. The surfaces have been reviewed where noisy data, or "fliers" are incorporated into the gridded solutions causing the surface to be shoaler or deeper than the true sea floor. Where these spurious soundings cause the gridded surface to vary from the reliably measured seabed by greater than the maximum allowable Total Vertical Uncertainty at that depth. the noisy data have been rejected by the hydrographer and the surface recomputed. Flier Finder, part of the QC Tools package within HydrOffice, was used to assist the search for spurious soundings following gross cleaning. Flier finder was run iteratively until all remaining flagged fliers were deemed to be valid aspects of the surface.QPSFledermaus7.8.10CARISHIPS and SIPS11.1.3NOAA Profile Version 2019Data acquisiton and processing notes are included in the acquisition and processing logs, and additional processing such as final seperation model reduction and soundspeed application are noted in the H13108 Data Log spreadsheet. All data logs are submitted digitally in the Separates I folder.Data LogsRaw backscatter data were stored in the .all file for Kongsberg systems. All backscatter were processed to GSF files, and a floating point mosaic per vessel was created by the field unit via Fledermaus FMGT 7.8.10. A relative backscatter calibration was performed by HSTB via a patch test in order to bring the survey systems on each of the launches into alignment. The offsets between launch sonar systems identified by the patch test were entered into the Processing Settings within FMGT to increase continuity in the backscatter imagery collected by each vessel. See Figure 16 for a table of the entered calibration values. Due to an artifact observed in the mosaic generated from all data collected at 300kHz, separate mosaics were generated for each vessel. See figure 15 for a greyscale representation of the complete mosaic. H13108 Backscatter mosaic with sheet limits overlaid (light blue)SupportFiles\H13108_Backscatter.pngBackscatter calibration valuesSupportFiles\Backscatter Calibration.pngAll data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.CAPT Marc MoserChief of Party2019-10-05LT Stephen MoultonOperations Officer2019-10-05HCST Samuel CandioChief Survey Technician2019-10-05HSST Alissa JohnsonSheet Manager2019-10-05As 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.897 Kodiak,AK 313 kHzProjected UTM 5Vessel kinematic data were post-processed using Applanix POSpac processing software and RTX positioning methods described in the DAPR. Smoothed Best Estimate of Trajectory (SBET) and associated error (RMS) data were applied to all MBES data in CARIS HIPS and SIPS.RTXNorth American Datum 1983ERS methods were used as final means of reducing H13108 to MLLW for submission.ERS via ERTDMP136RA2019_ERTDM_NAD83-MLLW.csarMean Lower Low WaterPer section 5.1.2.3 of the Field Procedures Manual (2014 ed), no Horizontal and Vertical Control Report has been generated for H13108.No present or planned construction or dredging exist within the survey limits.No new insets are recommended for this area.No ferry routes or terminals exist for this survey.No Aids to navigation (ATONs) exist for this survey.No overhead features exist for this survey.No abnormal seafloor and/or environmental conditions exist for this survey.H13108 survey limits extended to the NALL (see section A.1) and all features within these limits were addressed and attributed in the H13108 Final Feature File. All features inshore of the NALL were attributed in the Final Feature File with the description of "Not Addressed" and remarks of "Retain as charted, not investigated due to being inshore of NALL" as per HSSD Section 7.3.1. Annotations, information, and diagrams collected on DP forms and boat sheets during field operations were scanned and included in the Separates I Detached Positions folder.No platforms exist for this survey.No new surveys or further investigations are recommended for this area.No submarine features exist for this survey.Bottom samples were assigned for this survey but were not acquired due to time constraints. No uncharted features exist for this survey.No charted features exist for this survey.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.Maritime Boundary Points were assigned for this survey, but were not addressed due to time constraints.A comparison was performed between survey H13108 and ENC US4AK5OM and US4AK5NM using Caris HIPS and SIPS. Sounding and contour layers were overlaid on the ENC to assess differences between the surveyed soundings and charted depths. ENC's were compared to the surface by extracting all soundings from the chart and creating and interpolated TIN surface which could be differenced with the surface from H13108. All data from H13108 should supersede charted data. Soundings from H13108 are in general agreement with charted depths on ENC US4AK5OM, with most depths agreeing to 1 fathom as shown in Figure 17 and Figure 19. The largest differences are seen in rocky areas near shore where differences range to 7 fathoms as seen in Figure 19. Contours from H13108 are in general agreement with charted contours on ENC US4AK5OM as shown in Figure 18.82019-09-05US4AK5OM800002018-08-23falseSoundings from H13108 are in general agreement with charted depths on ENC US4AK5NM with most depths agreeing to 1 fathom as shown in Figure 17 and Figure 19. Contours from H13108 are in general agreement with charted contours on ENC US4AK5NM as shown in Figure 18. 172019-09-05US4AK5NM800002018-10-11falseDifference surface between H13108 and interpolated TIN surface from US4AK5OM and US4AK5NMSupportFiles\H13108_ENC_Chart_Comparison.pngOverview of H13108 contours overlaid onto ENC US4AK5OM and US4AK5NMSupportFiles\H13108_Contours.pngOverview of H13108 soundings (in purple) overlaid onto ENC US4AK5OM and US4AK5NMSupportFiles\H13108_ENC_Sounding_Comparison.png H13108 has one shoal and hazardous Underwater Rock feature, shown in Figure 20, that has been addressed in the H13108 Final Feature File. There is a gap in the data that does not constitute a holiday however the least depth of the rock was not obtained during field operations due to safety concerns; as a result the Final Feature File is missing the VALSOU for the new Underwater Rock Feature.H13108 new shoal featureSupportFiles\H13108_Shoal Feature.pngNOAA specifications (2019 HSSD) state that all significant shoals or features found in waters less than 20m need to be developed to complete coverage standards therefore the data gap mentioned above does constitute a holiday. Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersNavigable Area2019Pacific Hydrographic BranchCDR Marc Moser 2019-07-22UTCAny 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 5N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit.2019-07-252019-07-28East Coast of Kodiak Island, AlaskaKodiak IslandOPR-P136-FA-19NOAA Ship Fairweather (S220)40000AlaskaUnited States12South of Narrow CapeH13108NOAAThe survey area is located in Kodiak Island, Alaska within the sub locality south of Narrow Cape.57.434048152.50473257.268997152.222652H13108 sheet limits (in purple) overlaid onto Chart 16593SupportFiles\H13108_Sheetlimits.pngThe area of Chiniak Bay supports the second busiest and third richest fisheries port in Alaska. Chiniak Bay is the gateway to Kodiak and has a survey vintage of 1933. In 2015, the Port of Kodiak was responsible for 514 million pounds of fish and $138 million dollars of product. This area has seen many groundings and near misses due to the number of dangers to navigation and pinnacles that exist in this area. The navigation of this area is further complicated by the number of vessels trying to enter and exit the Port of Kodiak via a choke point located at the channel entrance buoy. In recent years a number of groundings in and around the area have occurred, the most famous being a 174 foot Army Landing craft that was outbound to deliver goods to a remote village in western Alaska in 2012. This survey will serve to update the nautical charts with modern data to support the above need. Data were acquired to the survey limits in accordance with the requirements in the Project Instructions and the March 2019 NOS Hydrographic Surveys Specifications and Deliverables (HSSD) as shown in Figure 1. In all areas where the 3.5 meter depth contour or the sheet limits were not met, the Navigable Area Limit Line (NALL) was defined as the inshore limit of bathymetry due to the risks of maneuvering the survey vessel in thick kelp. An example of such an area is shown in Figure 2. H13108 NALL defined by kelpSupportFiles\Kelp Defined NALL.pngH13108 survey coverage with sheet limits (in light blue) overlaid onto Chart 16593SupportFiles\H13108_Coverage overview.pngData acquired in H13108 meet multibeam echo sounder (MBES) coverage requirements for complete coverage,as required by the HSSD. This includes crosslines (see Section B.2.1), NOAA allowable uncertainty (see Section B.2.10), and density requirements (see Section B.2.11). Additional compliance statistics can be found in the Standards and Compliance located in Appendix II of this report. The entire survey is adequate to supersede previous data.2019-07-252019-07-262019-07-272019-07-2838.310000FA28050000000081.91FA28079.370000000114.88FA28080000000083.66S22016.130000000360.5625.50003.9800000641.01The entirety of H13108 was acquired with complete coverage MBES, meeting requirements listed above and in the HSSD. See Figure 3 for an overview of coverage.All waters in survey area Complete Coverage