All sounding systems were calibrated as detailed in the DAPR.All data reduction procedures conform to those detailed in the DAPR.Raw Backscatter was logged as both .all and .7k files and has been sent to the National Centers for Environmental Information (NCEI). Backscatter was not processed by the field unit.Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR.For MBES operations conducted on S221, sound speed profiles were acquired using the Rolls Royce MVP200 approximately every hour or as recommended by Seafloor Information System (SIS). Recommendations for casts are made by displaying a yellow or red background on the sound speed value within the SIS program. Yellow indicated 2m/s difference between the last cast and the real-time surface sound speed, while red indicated 5m/s difference. All casts were concatenated into a master file and applied to lines using the "Nearest in distance within time (4 hours)" profile selection method. Examination yielded little or no degradation of data quality. Due to the MVP's limited functionality on DN149 and DN150, variations in sound speed application occurred for some lines. In Caris HIPS, the option "Nearest in Distance within 6 hours" was used for DN149 line 0008 and DN150 lines 0009-0010. The intervals for casts taken on DN149 were approximately 8 hours apart and 5 hours apart. For the four casts taken on DN150, intervals between casts were approximately 1 hour apart, 5 hours apart, and 5 hours apart.Sound speed application option "Nearest in Distance within 6 hours" was also applied to DN 152 lines 0011 - 0018.There were sound speed errors identified in the data that are likely a result of the MVP issues noted above. The data has been reviewed and has been deemed adequate for charting despite the presence of the refraction errors.MVP MalfunctionOn DN149 and DN150, the Moving Vessel Profiler 200 (MVP200) onboard S-221 (Rainier) was not fully functional and only capable of taking static casts. Because of this issue, the recommended cast frequency of four hours was not met. No adverse effects were seen in the data. Please see Sound Speed Methods for further information.All equipment and survey methods were used as detailed in the DAPR.00.08161.05S221 (Rainier)3.152803file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/ms_4m_Finalized_TVU_QC.pngUncertainty Standards Generated by PydroUncertainty values of submitted finalized grids were calculated in Caris using the "Greater of the Two" of uncertainty and standard deviation (scaled to 95%). To visualize where uncertainty requirements were met, for each surface a custom IHO Order 1 Uncertainty layer was created, based on the difference between the calculated uncertainty of the nodes and the allowable uncertainty defined in the HSSD. To quantify the extent to which requirements were met, the HSSD Compliance layers were queried within Caris and examined in Excel. Overall, 99.99% of survey H12781 nodes met the uncertainty requirements specified in the HSSD.None ExistThere were no other factors that affected corrections to soundings.H1259540000NWNOAA Ship RAINIER2013Overlap with survey H12595 was approximately 175 to 615 meters wide, covering an area of .65 square nautical miles along the northwestern boundary of H12781. Depths in the junction area range from approximately 63-75 meters. Surfaces with a 4-meter resolution were used for comparison. For the respective depths, the difference surface was compared to the allowable TVU standards specified in the HSSD. In total, 99.563% of the depth differences between H12781 and junction survey H12595 are within allowable uncertainties.H1278040000NNOAA Ship FAIRWEATHER2015Overlap with survey H12780 was approximately 250 to 600 meters wide, covering an area of 1.28 square nautical miles along the northern boundary of H12781. Depths in the junction area range from approximately 63-74 meters. Though the depths called for a 4-meter resolution surface, we were only provided with an 8-meter resolution surface, therefore comparison of 8-m surfaces was conducted. For the respective depths, the difference surface was compared to the allowable TVU standards specified in the HSSD. In total, 99.887% of the depth differences between H12781 and junction survey H12780 are within allowable uncertainties.H1278240000WNOAA Ship FAIRWEATHER2015Overlap with survey H12782 was approximately 275 to 845 meters wide, covering an area of 1.39 square nautical miles along the western boundary of H12781. Depths in the junction area range from approximately 75-98 meters, therefore 8-meter resolution surfaces were used. For the respective depths, the difference surface was compared to the allowable TVU standards specified in the HSSD. In total, 99.719% of the depth differences between H12781 and junction survey H12782 are within allowable uncertainties.file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/Junctions.jpgOverview of junctions with survey H12781.Three junction comparisons were completed for H12781. One survey (H12595) was acquired by NOAA Ship Rainier in 2013, and two surveys (H12780 and H12782) were completed in 2015 by NOAA Ship Fairweather. Depth comparisons were performed using Caris difference surfaces. Due to rounding, the percent of nodes satisfying HSSD accuracy for depths less than 100 meters is listed in the table as 100.0%, but the actual percentage is 99.968%.file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/DR%20Image.jpgDepth differences between H12781 mainscheme and crossline data as compared to HSSD TVU accuracy standards for associated depths. Mainscheme lines shown in gray.file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/XL_Analysis_IHO_Compliance.jpgSummary table indicating percentage of difference surface nodes between H12781 mainscheme and crossline data that met HSSD allowable TVU standards for associated depths.Multibeam crosslines were acquired using Rainer (S-221) and Rainier launch 2803 (RA-3). A 4-meter CUBE surface was created using only H12781 mainscheme lines, and a second 4-meter surface was created using only crosslines. A 4-meter difference surface was then generated in Caris from which statistics were derived. For its respective depths, the difference surface was compared to the IHO allowable total vertical uncertainty (TVU) standards. In total, 99.944% of the depth differences between H12781 mainscheme and crossline data met HSSD TVU standards. NOAA Profile V_5_3.9.0.15HIPS/SIPSCaris551124NOAA_4mH12781_MB_4m_MLLWComplete MBESCUBE551128NOAA_8mH12781_MB_8m_MLLWComplete MBESCUBE55804NOAA_4mH12781_MB_4m_MLLW_FinalComplete MBESCUBE721128NOAA_8mH12781_MB_8m_MLLW_FinalComplete MBESCUBE4.770.4S-2211.18.82803Refer 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.Positioning and Attitude SystemApplanixPOS MV v4MBESKongsbergEM710Sound Speed SystemResonSVP70Conductivity, Temperature, and Depth SensorOdim Brooke Ocean (Rolls Royce Group)Moving Vessel Profiler 200MBESResonSeaBat 7125-BSound Speed SystemResonSVP71Shumagin IslandsShumagin IslandsNOAA Ship RAINIEROPR-P183-RA-15H12781Alaska4000013 NM Southeast of Simeonof Island5United States2015UTC2015-06-012015-05-29Navigable Area2015-04-06Edward J. Van Den Ameele, CDR/NOAAUniversal Transverse Mercator (UTM)metersThe purpose of this survey is to provide contemporary surveys to update National Ocean Service (NOS) nautical charts. All separates are filed with the hydrographic data. Notes in red were generated during office processing. The processing branch concurs with all information and recommendations in the DR unless otherwise noted. Page numbering may be interrupted or non-sequential. All pertinent records for this survey, including the Descriptive Report, are archived at the National Centers for Environmental Information (NCEI): https://www.ncei.noaa.gov/Multibeam Echo Sounder BackscatterMultibeam Echo SounderPacific Hydrographic BranchNOAA159.1203954.812895158.92272154.595757The survey area is referred to as Sheet 5 within the Project Instructions. The area encompasses approximately 71.4 square nautical miles.Either: A) Complete MBES with backscatter OR B) 100% SSS with concurrent line spacing MBES with backscatter.All waters in survey areaSurvey coverage was in accordance with the requirements in the Project Instructions and the HSSD.The entire survey is adequate to supersede previous data.Data acquired for survey H12781 met complete multibeam echosounder (MBES) coverage requirements, including the 5 soundings per node data density requirements in at least 95% of all nodes. In order to extract statistics of the data density achieved, the density layer of each finalized surface was queried within Caris then examined in Excel. Overall, the required data density was achieved in 99.973% of nodes.71.403000000518.19700031.856S-2210000000012.24628030000518.1970008.544.1022015-05-292015-05-302015-05-312015-06-01file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/Area_surveyed_1.pngH12781 coverage overlay on Chart 16540file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/Area_surveyed_2.pngH12781 coverage overlay on Chart 500Survey limits were acquired in accordance with the requirements in the Project Instructions and the HSSD.The purpose of this survey is to provide contemporary data to update National Ocean Service (NOS) nautical charting products. This area is considered navigationally significant and of critical survey priority. In addition, soundings will support a new larger scale navigation chart.No charted features exist for this survey.file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/Chart_comparison.pngH12781 selected soundings overlaid on Chart 16540.A chart comparison was performed using Caris sounding and contour layers. The contours and soundings were overlaid on the chart and compared for general agreement and to identify areas of significant change.No Maritime Boundary Points were assigned for this survey.The Final Feature File was submitted with the survey data and is not appended to this report.Bottom samples were addressed as required by the HSSD; for results refer to the H12781 Final Feature File submitted with this report.No uncharted features exist for this survey.No shoals or potentially hazardous 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.2014-04-09true2014-04-09300000US3AK50M17Results of the ENC chart comparison were the same as with chart 16540.Survey soundings agree to within 3 fathoms with three notable exceptions. In the southeast corner of the survey area, there are surveyed depths of 55 fathoms over a charted 62 fathom sounding. In the north central area of the survey area, there are surveyed 30 fathoms soundings 1.5 nautical miles west of a charted 44 fathom sounding. In the northwest corner of the survey area, there are surveyed 36 fathom soundings immediately adjacent to a charted 57 fathom sounding that is on the edge of survey coverage.165402010-1025283000002015-02-142015-03-0313Chart 16540 includes five depths in the H12781 survey area. Survey soundings agree to within 5 fathoms of the chart with one exception. In the southeast of the survey area, H12781 soundings of approximately 55 fathoms were acquired over the charted 62 fathom depth. In the northwest of the survey, an area of 30 fathom soundings was located approximately 1.5 nautical miles west southwest of a charted 44 fathom depth. The charted 50-fathom contour is in generally good agreement with H12781 soundings (Figure 8).No Danger to Navigation Reports were submitted for this survey.No new insets are recommended for this area.No significant features exist for this survey.No Aids to navigation (ATONs) exist for this survey.No prior survey comparisons exist for this survey.No ferry routes or terminals exist for this survey.No platforms exist for this survey.No present or planned construction or dredging exist within the survey limits.No submarine features exist for this survey.No overhead features exist for this survey.No new surveys or further investigations are recommended for this area.As there was no shoreline within the survey limits, shoreline was not assigned in the Hydrographic Survey Project Instructions or Statement of Work.POS/MV files were logged for DN 151, however, due to the UPS failure, there are two POS files for that day. According to the detailed line query, all DN 151 lines, including 0017 and 0018, have delayed heave applied, but SBET and RMS were not applied to 0017 and 0018, therefore, GPS tide was not computed for those lines.Missing POS/MV DataDuring acquisition on DN151, the Uninterrupted Power Supply (UPS) on S-221 failed causing a loss of power to the ship's Applanix POS/MV system. As a result, the POS file for that day was not logged during the entire time of acquisition. S-221 DN151 lines 0017 and 0018 do not have delayed heave applied, which precluded the ability for SBET / RMS data to be applied in post processing. SBETs and RMS were also not applied to the DN 152 crosslines collected with the Reson. According to the line query, of the lines listed above, only DN 152 line 0079 does not have SBET and RMS applied.file:///M:/OPRP183RA15/Surveys/H12781/Report/Original/Descriptive_Report/Report/SupportFiles/Lines%20without%20SBETs.jpgLines without SBETsLines without SBETsIn addition to the lines with no POS data, SBETs and RMS would not apply to the following lines: DN152, lines 0045, 0046, 0047, 0048, 0049, 0050, 0051, and 0079. DGPS was used for positioning of these lines; all H12781 data meets HSSD horizontal accuracy requirements. ERZT Issues The application of Ellipsoid Referenced Zoned Tides (ERZT) was attempted and unsuccessful. The attempt created vertical offsets throughout the survey and corrupted SBET data. As a result, data was completely reprocessed in Caris by creating a new project. Because of the issues with ERZT, all data have been referenced to MLLW using discrete tidal zoning.North American Datum of 1983 (NAD83) Zone 4Simeonof Island 9677Simeonof IslandSingle BaseThe base station used for this project was installed by NOAA Ship Fairweather and was named "Simeonof Island" and was installed on the northern shore of Simeonof Island. Refer to the HVCR for further information.Cold Bay, Alaska (289kHz)Universal Transverse Mercator (UTM)Mean Lower Low Water2015-06-102015-06-24Discrete ZoningFinal Approved9459450.tidFinalP183FA2015CORP.zdfSand Point9459450Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.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 and Specifications Deliverables Manual, 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.Commanding Officer, NOAA Ship RainierEdward J. Van Den Ameele, CDR/NOAA2015-12-11Field Operations Officer, NOAA Ship RainierAdam Pfundt, LT/NOAA2015-12-11Chief Survey Thechnician, NOAA Ship RainierJames B. Jacobson2015-12-11Hydrographic Assistant Survey Technician, NOAA Ship RainierChris Palmer2015-12-11