file:///M:/OPRL321FA19/Surveys/W00480/Processed/Reports/Survey/Descriptive_Report/Report/SupportFiles/W00480_MB_VR_MLLW.QAv5.tvu_qc.pngW00480 compliance with uncertainty standardsfile:///M:/OPRL321FA19/Surveys/W00480/Processed/Reports/Survey/Descriptive_Report/Report/SupportFiles/W00480_MB_VR_MLLW.QAv5.density.pngW00480 compliance with density standardsThe surface was analyzed using HydrOffice QC Tools Grid QA feature to determine compliance with the specifications. Overall, 99.98% of nodes within the surface meet the NOAA Allowable Uncertainty specifications for W00480 (Figure 2). Density requirements were achieved for W00480 with 99.69% of surface nodes containing five or more soundings as required by the HSSD Section 5.2.2.3 (Figure 3).The project was conducted in support of the Expanding Pacific Research and Exploration of Submerged Systems (EXPRESS) campaign which is comprised of a large and diverse team of federal and non-federal partners targeting deepwater areas off of the U.S. Pacific Coast. The primary objective of this project is to collect data for surficial geology, benthic habitats, sub-bottom faults, geologic hazards, and sedimentary processes. Data from this project will support a variety of disciplines including offshore energy projects and infrastructure, marine spatial planning, ecosystem assessments, and marine geohazards. NOAA, in collaboration with the USGS and BOEM will conduct a coordinated multibeam echo sounder survey of the project area to collect bathymetry, acoustic backscatter data, and water column data. Bathymetric data from this project will be further used to update NOAA's nautical charting products within the area. This project will cover a total of 1,757 SNM and survey data from this project is intended to supersede all prior survey data in the common area.file:///M:/OPRL321FA19/Surveys/W00480/Processed/Reports/Survey/Descriptive_Report/Report/SupportFiles/W00480_Sheet_Limits.pngW00480 Coverage overlaid on chart 18022 with sheet limits in blue34.3791513889120.87136786134.0823350833120.655743056This hydrographic survey was acquired in accordance with the requirements defined in the Project Instructions for OPR-L321-FA-19. The survey area is located by Arguello Canyon offshore South-Central California. Coverage acquired in W00480 is shown in Figure 1 below. Sheet Limits for W00480 were not reached due to weather conditions which were not conducive to survey acquisition and time limitations.The survey data meets or exceeds requirements as set forth in the NOS Hydrographic Surveys Specifications and Deliverables, Field Procedures Manual, Standing and 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 Survey Summary Report.All field sheets, this Survey Summary Report, and all accompanying records and data are approved. All records are forwarded for final review and processing to the Processing Branch.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.Chief of Party2020-01-06CAPT Marc MoserOperations Officer2020-01-06LT Stephen MoultonChief Survey Technician2020-01-06HCST Samuel CandioSheet Manager2020-01-06HST Michelle WiegertPer section 5.1.2.3 of the Field Procedures Manual (2014 ed), no Horizontal and Vertical Control Report has been generated for W00480.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. The Wide Area Augmentation system (WAAS) was used for real-time horizontal control during data acquisition.Additional Resultsfile:///M:/OPRL321FA19/Surveys/W00480/Processed/Reports/Survey/Descriptive_Report/Report/SupportFiles/W00480_Chart_Comparison.pngComparison of W00480 and ENCs US3CA85M (Top) and US3CA69M (Bottom)file:///M:/OPRL321FA19/Surveys/W00480/Processed/Reports/Survey/Descriptive_Report/Report/SupportFiles/W00480_Backscatter.png W00480 backscatter mosaic overlaid on chart 18022 with sheet limits in bluefile:///M:/OPRL321FA19/Surveys/W00480/Processed/Reports/Survey/Descriptive_Report/Report/SupportFiles/W00480_Shipwreck_Feature.pngW00480 non dangerous wreck feature observed backscatterENC Comparison Soundings from W00480 are in general disagreement with the charted depths on ENC US3CA69M, with most depths disagreeing by no more than 40 meters as shown in Figure 3. The largest differences are seen near the southwest corner where depths are over 100 meters deeper than those charted. Soundings from W00480 are also in general disagreement with the charted depths on ENC US3CA85M, with most depths disagreeing by no more than 20 meters as shown in Figure 4. The most abundant differences are seen in the two canyons in the northeast corner where depths are over 100 meters deeper than those charted. Backscatter 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 7.8.10 (Figure 5). Features The non dangerous WRECK feature located at the NE corner of W00480 was not observed in the multibeam data but can possibly be interpreted in the backscatter data. For this reason, it is recommended that the wreck at this location be retained Crosslines Crosslines were not required in project instructions and were not collected.The entire survey is adequate to supersede previous data.Data acquired in W00480 meet multibeam echo sounder (MBES) coverage requirements for complete coverage, as required by the HSSD.NOAA_VR120.21029.0Complete MBESCARIS VR Surface (CUBE)W00480_MB_VR_MLLWVariable ResolutionNOAA_VR120.01029.0Complete MBESCARIS VR Surface (CUBE)W00480_MB_VR_MLLW_FinalVariable ResolutionThe NOAA CUBE parameters defined in the HSSD were used for the creation of all CUBE surfaces for W00480. 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 seafloor. Where these spurious soundings cause the gridded surface to be shoaler or deeper than the reliable 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 sounding following gross cleaning. Flier Finder was run iteratively until remaining flagged fliers were deemed to be valid aspects of the surface.US3CA69M2000002019-06-13242019-05-16US3CA85M2161162018-10-11202017-10-172019metersNorth American Datum 198380000W00480CAPT Marc MoserProjected UTM 10Navigable AreaCalifornia2019-10-042019-10-03Any 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 XXN, <vertical datum>. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit.OPR-L321-FA-192019-09-232019-08-23Mean Lower Low WaterPacific Hydrographic BranchNOAA Ship Fairweather (S220)VDatumKongsberg MaritimeMBESEM 710Kongsberg MaritimeMBES BackscatterEM 710Arguello CanyonOffshore South-Central CaliforniaPlease reference Data Acquisition and Processing Report OPR-L321-FA-19 for a complete description of data acquisition and processing systems, survey vessels, quality control procedures and data processing methods.