OPR-L397-FA-22 Channel Islands National Marine Sanctuary California NOAA Ship Fairweather (S220) H13555 1 6NM Southeast of Santa Rosa Island California United States 20000 2022 CDR Meghan Mcgovern Navigable Area 2022-09-09 2022-11-01 2022-11-03 Multibeam Echo Sounder Multibeam Echo Sounder Backscatter meters UTC Pacific Hydrographic Branch Any 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 10N and NAD83 UTM 11N , MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit. 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). NOAA The survey area is located 6NM Southeast off the coast of Santa Rosa Island, California. Data were acquired within the following survey limits 33.87833333333333 120.10499999999999 33.844 119.94499983333334 H13555 sheet limits (in blue) overlaid onto chart: US3CA69M file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Survey%20Limits/H13555_Survey_Outline.JPG Data were acquired to the survey limits in accordance with the requirements in the Project Instructions and the 2022 NOS Hydrographic Surveys Specifications and Deliverables (HSSD). Coverage acquired in H13555 is shown in Figure 1. This year the Channel Islands National Marine Sanctuary work will focus on the remaining survey area (prior projects 2017-2019 and 2021) offshore of the Channel Islands (about 40 SNM), located about 30 miles offshore of the California mainland city of Santa Barbara. This area is a popular tourist location, with regular commercial and recreational fishing, diving, and pleasure craft. It also covers Johnson's Lee, a location regularly used for anchorage in foul weather. Inaccurate charting data in these well-traveled areas poses a serious risk to life, property and the delicate ecosystem within the Channel Islands National Marine Sanctuary. In addition to providing data for crucial nautical chart updates, this survey will also generate backscatter data, which will be used in habitat mapping and substrate analysis. Both multibeam echo sounder and backscatter data will not only serve to enhance marine navigational safety, but will also be used by sanctuary managers, planners, and researchers, aiding them in the conservation of this most precious resource. The entire survey is adequate to supersede previous data. Data acquired in H13555 meet multibeam echo sounder (MBES) coverage requirements for complete coverage/set line spacing, as required by the HSSD. This includes cross lines (see Section B.2.1), NOAA allowable uncertainty (see Section B.2.10), and density requirements (see Section B.2.11). All waters in survey area. Complete Coverage. The entirety of H13555 was acquired with Complete Coverage, meeting the requirements listed above and in the HSSD. H13555 survey coverage overlaid onto chart: US3CA69M file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Survey%20Coverage/H13555_Coverage.JPG S220 0.0 359.03 0.0 0.0 0.0 0.0 0.0 20.82 0.0 0.0 359.03 0.0 0.0 0.0 0.0 0.0 28.02 0.0 5.48 0 0 0 0 36.77 2022-11-01 2022-11-02 2022-11-03 Refer to the OPR-L397-FA-22_CINMS 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. S220 70.4 4.8 NOAA Ship Fairweather (S220) file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Fairweather_S220/FA_S_220.JPG All units are in meters. MBES Kongsberg Maritime EM 712 MBES Backscatter Kongsberg Maritime EM 712 Conductivity, Temperature, and Depth Sensor AML Oceanographic MVP200 Positioning and Attitude System Applanix POS MV 320 v5 Sound Speed System Teledyne RESON SVP 70 The equipment was installed on the survey platform as follows: S220 utilizes the Kongsberg EM 712 MBES, a POS M/V v5 system for position and attitude, SVP 70 surface sound speed sensors, and AML Oceanographic MVP 200 for conductivity, temperature, and depth (CTD) casts. Crosslines 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). Statistics show the mean difference between the depths derived from mainscheme data and crossline data was 0.10 meters with mainscheme being deeper and 95% of nodes falling within 0.27 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 H13555 mainscheme and crossline data were within allowable NOAA uncertainties. Overview of H13555 crosslines file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Crosslines/Crossline_Mainshceme.JPG H13555 crossline and mainscheme difference statistics file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Crosslines/H13555_Mainscheme_VR-H13555_Crossline_VR_depth_delta.jpg ERS via VDATUM 0.0 7.8 S220 N/A 1 N/A 0.5 In addition to the usual a prior estimates of uncertainty via device models for vessel motion and VDATUM, real-time and post-processed uncertainty sources were also incorporated into the depth estimates of survey H13555. Real-time uncertainties were provided via EM 2040 MBES 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 a Smoothed Best Estimate of Trajectory (SBET) RMS file generated in Applanix POSPac. H13555 junctions with 2 surveys from prior projects, H13088 and W00447 as shown in Figure 6. Data overlap between H13555 and each adjacent survey was achieved. These areas of overlap between surveys were reviewed in CARIS HIPS and SIPS by surface differencing (at equal resolutions) to assess surface agreement. The multibeam data were also examined in CARIS Subset Editor for consistency and agreement. Junction with H13555 and H13088 are generally within the NOAA allowable uncertainty in their areas of overlap. Junctions with H13555 and W00447 exceed the NOAA allowable uncertainty in their areas of overlap. W00447 was conducted at a different data density and with XBT casts for sound speed measurements. Due to W00447 higher level of survey uncertainty, a greater difference between the surveys is expected. For all junctions with H13555, a negative difference indicates H13555 was shoaler and a positive difference indicates H13555 was deeper. Overview of H13555 junction surveys file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Junctions/H13555_Overview/H13555_Junction%20Overview.JPG H13088 20000 2018 NOAA Ship Rainier N Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the surface from H13555 and the surface from H13088 (Figure 7). The statistical analysis of the difference surface shows a mean of 0.10 meters with 95% of the nodes having a maximum deviation of +/- 0.39 meters, as seen in Figure 8. It was found that 99.50% of nodes are within NOAA allowable uncertainty. Difference surface between H13555 (purple) and junctioning survey H13088 (green) file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Junctions/H13555_H13088/H13555_H13088.JPG Difference surface statistics between H13555 and H13088 file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Junctions/H13555_H13088/H13555_MB_VR_MLLW_UTM11_Final-H13088_MB_VR_MLLW_depth_delta.jpg W00447 220 2011 NOAA Ship Okeanos Explorer S Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the surface from H13555 and the surface from W00447 (Figure 9). The statistical analysis of the difference surface shows a mean of 0.70 meters with 95% of the nodes having a maximum deviation of +/- 12.89 meters, as seen in Figure 10. It was found that 77.97% of nodes are within NOAA allowable uncertainty. Difference surface between H13555 (purple) and junctioning survey W00447 (grey) file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Junctions/H13555_W00447/H13555_W00447.jpg Difference surface statistics between H13555 and W00447 file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Junctions/H13555_W00447/H13555_MB_VR_MLLW_UTM10_Final-W00447_depth_delta.jpg Difference surface compliance with NOAA allowable uncertainty between H13555 (purple) and junctioning survey W00447 (grey) file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Junctions/H13555_W00447/H13555_W00447_Allowable.jpg Difference surface statistics between H13555 and W00447 showing percentage of nodes meeting NOAA allowable uncertainty file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Junctions/H13555_W00447/H13555_W00447_Allowable_Table.JPG Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR. None Exist There were no conditions or deficiencies that affected equipment operational effectiveness. None Exist There were no other factors that affected corrections to soundings. Casts were conducted at a minimum of one every four hours during launch acquisition. Casts were conducted more frequently in areas where the influx of freshwater had an effect on the speed of sound in the water column and when 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 210 minutes, guided by observation of the surface sound speed and targeted to deeper areas. All sound speed methods were used as detailed in the DAPR. All equipment and survey methods were used as detailed in the DAPR. Holiday H13555 data were reviewed in CARIS HIPS and SIPS for holidays in accordance with Section 5.2.2.3 of the HSSD. Zero holidays which meet the definition described in the HSSD for complete coverage were identified via HydrOffice QC Tools Holiday Finder tool. This tool automatically scans the surface for holidays as defined in the HSSD. NOAA Allowable Uncertainty The surface was analyzed using the 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 H13555 in UTM Zone 10 (Figure 13). Overall, 99.5% of nodes within the surface meet NOAA Allowable Uncertainty specifications for H13555 in UTM Zone 11 (Figure 14). H13555 in UTM Zone 10 allowable uncertainty statistics file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/HSSD%20Graph%20Checks_%20QC/H13555_MB_VR_MLLW_Final.QAv6.tvu_qc.jpg H13555 in UTM Zone 11 allowable uncertainty statistics file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/HSSD%20Graph%20Checks_%20QC/H13555_MB_VR_MLLW_UTM11_Final.QAv6.tvu_qc.jpg Density The surface was analyzed using the HydrOffice QC Tools Grid QA feature to determine compliance with specifications. Density requirements for H13555 in UTM Zone 10 were achieved with at least 99.5% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3 (Figure 15). Density requirements for H13555 in UTM Zone 11 were achieved with at least 99.5% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3 (Figure 16). H13555 in UTM Zone 10 data density statistics file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/HSSD%20Graph%20Checks_%20QC/H13555_MB_VR_MLLW_UTM10_Final.QAv6.density.jpg H13555 in UTM Zone 11 data density statistics file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/HSSD%20Graph%20Checks_%20QC/H13555_MB_VR_MLLW_UTM11_Final.QAv6.density.jpg All data reduction procedures conform to those detailed in the DAPR. All sounding systems were calibrated as detailed in the DAPR. Raw backscatter data were stored in the .all file for Kongsberg systems. All backscatter were processed to GSF files and a floating point mosaic was created by the field unit via Fledermaus FMGT 7.10.2 for each UTM zone in H13555. See Figure 17 for a greyscale representation of the complete mosaic. Backscatter mosaic for H13555. file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Backscatter/H13555_Backscatter.JPG CARIS HIPS and SIPS 11.4 QPS Fledermaus 7.10.2 NOAA Profile Version 2021 H13555_MB_VR_MLLW_UTM10_Final.csar CARIS VR Surface (CUBE) Variable Resolution 112.7 556.9 NOAA_VR Complete MBES H13555_MB_VR_MLLW_UTM11_Final.csar CARIS VR Surface (CUBE) Variable Resolution 26.0 399.6 NOAA_VR Complete MBES H13555_MB_VR_MLLW_UTM10.csar CARIS VR Surface (CUBE) Variable Resolution 112.7 556.9 NOAA_VR Complete MBES H1355_MB_VR_MLLW_UTM11.csar CARIS VR Surface (CUBE) Variable Resolution 26.0 399.6 NOAA_VR Complete MBES The NOAA CUBE parameters defined in the HSSD were used for the creation of all CUBE surfaces for H13555. The CUBE surfaces were created for each portion of the sheet based on the UTM zone at the survey location. 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 and/or outside the designated survey area. All 131 flagged fliers for H13555 were deemed to be actual representations of the sea floor (figure 18 and 19). Flagged Fliers investigated for H13555 in UTM Zone 10 deemed to be actual representations of the sea floor. file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Flier%20Finder/H13555_UTM10_Flier.jpg Flagged Fliers investigated for H13555 in UTM Zone 11 deemed to be actual representations of the sea floor. file:///M:/OPRL397FA22/Surveys/H13555/01_HDR/Reports/Descriptive_Report/Components/Images/Flier%20Finder/H13555_UTM11_Flier.jpg Per Section 5.2.2.1.3 of the 2020 Field Procedures Manual no Horizontal and Vertical Control Report has been generated for H13555. Mean Lower Low Water ERS via VDATUM OPR-L397-FA-21_100m_NAD83_2011-MLLW_geoid18.csar ERS methods were used as the final means of reducing H13555 to MLLW for submission. North American Datum 1983 Projected UTM 10 RTX H13555 spanned both North American Datum 1983 Projected UTM 10 and Projected UTM 11. For all processed data the sections of H13555 were processed utilizing the respective datum. Files have been labeled to identify which datum was utilized for the data. UTM Zone separations were highlighted in Figure 1 under section 1. Vessel 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. During real-time acquisition, all platforms received correctors from the Wide Area Augmentation System (WAAS) for increased accuracies similar to USCG DGPS stations. WAAS and SBETs were the sole methods of positioning for H13555, as no DGPS stations were available for real-time horizontal control. US3CA69M 232188 28 2022-01-18 2022-08-18 No shoals or potentially hazardous features exist for this survey. No charted features exist for this survey. No uncharted features exist for this survey. No channels exist within the survey limits. No Aids to navigation (ATONs) exist for this survey. No Maritime Boundary Points were assigned for this survey. No bottom samples were required for this survey. No overhead features exist for this survey. No submarine features exist for this survey. No platforms exist for this survey. No ferry routes or terminals exist for this survey. No abnormal seafloor 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 ENC scales 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 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. CDR Meghan McGovern Chief of Party 2023-04-16 LTJG Taylor Krabiel Operations Officer 2023-04-16 ENS Sarah Rollings Sheet Manager 2023-04-16