OPR-P136-RA-12North Coast of Kodiak Island, AKNorth Coast of Kodiak IslandNOAA Ship RAINIERH124962Entrance to Kizhuyak BayAlaskaUnited States400002012Richard T. Brennan, CDR/NOAANavigable Area2012-07-022012-10-092012-10-25Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersMean Lower Low WaterfathomsMean Lower Low WaterUniversal Transverse Mercator (UTM)UTCPacific Hydrographic BranchThe project area is referred to as Sheet 2: Entrance to Kizhuyak Bay within the Project Instructions. The area is where Whale Passage, Kizhuyak Bay, and Marmot Bay meet in North Kodiak (Figure 1).57.9458333333152.79483333357.8119444444152.7944444441H12496 survey limits.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Survey%20Limits.jpgThe purpose of this project is to provide contemporary surveys to update National Ocean Service (NOS) nautical charting products, which will support Kodiak's large fishing fleet and increasing levels of passenger vessel traffic.The entire survey is adequate to supersede previous data.Data acquired on survey H12496 met complete multibeam coverage requirements, including the 5 soundings per node data density requirements outlined in section 5.2.2.2 of the HSSDM (Figure 2). Overall, 98.6% of the data satisfies data density requirements. Low density occurred primarily where data was acquired using the tilted (34-degrees) Reson 8125 mounted on Launch 2803 (RA-3) which can only be operated in a equi-angular mode (Figure 4). In spite of the low density, all data was retained for charting, per the recommendations of the Hydrographic Survey Division (see Supplemental Correspondence - 8125 density.jpg).2H12496 data density.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Density.jpg3Summary table showing the percentage of nodes satisfying the 5 node sounding density requirements, sub-divided by the appropriate depth ranges. Note: The final row has a unit of square meters, and sums the number of different resolution nodes into a common unit of area.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Density_Stats.jpg4H12496 Reson 8125 low density data.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Density_8125.jpgSurvey limits were acquired in accordance with the requirements in the Project Instructions and the Hydrographic Surveys Specifications and Deliverables Manual (HSSDM).5Acquired survey coverage overlaid on Chart 16594.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Survey_Coverage.tifComplete multibeam echosounder (MBES) coverage was achieved within the limits of hydrography as specified in the Project Instructions with the following exceptions: Multibeam coverage did not reach the survey limits or the 4-meter contour in seven locations (Figure 6). In several of these cases, the 4-meter contour was thought to be surveyed but shifted slightly deeper after application of final tides. A small holiday exists on the northern edge of survey H12496 but is completely covered by H12495 data (Figure 7). Three holidays exist on the northwest edge of the survey along Whale Island where a combination of sea state and proximity to shore made it unsafe to approach. Additionally, environmental factors affecting surface sound velocity measurements caused data to fail to meet specification for allowable uncertainty and therefore was rejected (Figure 8). The decision to reject data that failed allowable uncertainty was made several months after departing the survey area and therefore was never reacquired. This data was located in the southern portion of Anton Larsen Bay and created a 600 by 50 meter holiday. See B.2.6.1 - Surface Sound Velocity. 6Area where multibeam coverage did not reach survey limits nor the 4-meter contour. Six other locations are shown in the detail area map (red boxes). file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Holiday_A_Example.jpg7Location where multibeam coverage did not reach survey limits but was covered by junctioning survey H12495. file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Holiday_B_Example.jpg8Holiday created due to rejected data that failed accuracy specifications.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Holiday_F_Example.jpg2012-10-092012-10-112012-10-162012-10-172012-10-182012-10-202012-10-212012-10-222012-10-232012-10-242012-10-25632024.7S-221000000022.002801 (RA-4)078.9000006.702802 (RA-5)078.000000002803 (RA-3)0139.2000001.502804 (RA-6)0174.5000001.600470.60000031.906.8Shoreline was investigated in accordance with the Project Instructions and the HSSDM.Bottom samples were acquired in accordance with the Project Instructions and the HSSDM.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.S22123116.42801 (RA-4)283.52802 (RA-5)283.52803 (RA-3)283.52804 (RA-6)283.51906 (RA-7)191.71905 (RA-8)190.8Data was acquired by RAINIER and her four survey launches (2801, 2802, 2803, and 2804). The vessels acquired MBES data, sound velocity profiles, and bottom samples. Shoreline was investigated using two RAINIER skiffs (1905 and 1906).KongsbergEM710MBESReson7125MBESApplanixPOS-MV V4Vessel Attitude and Positioning SystemSeabirdSBE 19Conductivity, Temperature, and Depth SensorSeabirdSBE 19 PlusConductivity, Temperature, and Depth SensorODIM Brooke Ocean (Rolls-Royce group)MVP 200Conductivity, Temperature, and Depth SensorResonSVP 70Sound Speed SystemResonSVP 71Sound Speed SystemMultibeam crosslines were acquired using the EM710 on RAINIER as well as the Reson 7125 on three launches (2801, 2803, 2804). Crosslines totaled 31.9 NM, which comprised 6.8% of mainscheme hydrography. A 4-meter CUBE surface was created using strictly the mainscheme lines, while a second 4-meter CUBE surface was created using only crosslines, from which a surface difference was generated at a 4-meter resolution (Figure 9). Statistics were then derived from the difference surface and are shown in Figure 10. The average difference between the depths derived from mainscheme and crosslines was -0.04 meters (mainscheme being shoaler) with a standard deviation of 0.23 meters. The largest differences (red and black) were seen in areas of high relief. In addition to performing a crossline comparison using surface differencing, the CARIS QC Report was used to compare the crossline soundings to the depth estimates of the 4-meter resolution surface. The depth differences are calculated for each crossline ping and then compared to the allowable IHO uncertainties. The output QC Report classifies the percentage of pings meeting IHO orders by beam angle. The table was copied and examined in Excel (Figure 11). On average, 99.8% of all soundings for any given depth and beam angle meet IHO Order 1 accuracies.9Crossline distribution for H12496. Red and black shows areas of highest variationfile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Crossline_Comparison.jpg10Mainscheme to crossline difference surface statistics. file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Crossline_Comparison_Stats.jpg11CARIS QC Report comparing crossline soundings to depth estimates.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Crossline_Comparison_beamstats.jpgS22110.05280130.15280230.15280330.15280430.15Total Propagated Uncertainty values for survey H12496 were derived from a combination of fixed values for equipment and vessel characteristics, as well as field assigned values for sound speed uncertainties. Tidal uncertainties were provided by NOAA's Center for Operational Oceanographic Products and Services (CO-OPS), and were applied to depth soundings using a Tidal Constituent and Residual Interpolation (TCARI) grid. TCARI automatically calculates the uncertainty associated with water level interpolation, which is then written into the CARIS HDCS (Figure 12). For this reason, no tidal uncertainty values were entered into the Tide Value section of the CARIS Compute TPU function. Uncertainty 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 the locations in which accuracy requirements were met for each finalized surface, a custom "IHOness" layer was created, based on the difference between calculated uncertainty of the nodes and the allowable IHO uncertainty (Figures 13 and 14). To quantify the extent to which accuracy requirements were met, the preceding "IHOness" layers were queried within CARIS and then examined in Excel (Figures 15). Overall, 100.0% of survey H12496 met the accuracy requirements stated in the HSSDM. For further uncertainty analysis, refer to Section B.2.1 - Crosslines (Figure 11)12TCARI uncertainty (2-sigma) and locations of the three tide gauges used for the TCARI grid (Kodiak, Nachalni, and Dovolno).file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_NKodiak_TCARI_Uncert.jpg13H12496 met the threshold IHO Order 1 standards for accuracy for depths 0 to 100-meters.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_IHOness_0_to_100.jpg14H12496 met the threshold IHO Order 2 standards for accuracy for depths 100-meters and greater.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_IHOness_100_to_150.jpg15Summary table showing the percentage of nodes satisfying the indicated IHO accuracy level, sub divided by the appropriate depth ranges.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_IHOness_Stats.jpgThree junction comparisons were completed for H12496 (Figure 16). One junctioning survey (H12317) was a NOAA Ship FAIRWEATHER survey from 2011 and two surveys (H12495 and H12512) were acquired concurrently with this survey. Depth comparisons were performed using difference surfaces and sounding comparison in CARIS Subset Editor. All surfaces were differenced such that positive differences correspond to deeper depths in H12496. Histograms of the surface differences are included, showing mean and standard deviation.H12317100002011NOAA Ship FAIRWEATHERNEThe junction overlap with H12317 was 20 to 200 meters in length along the northeastern border of H12496. A combined 8-meter surface from H12317 was compared to a combined 8-meter surface from H12496 (Figure 17). Larger differences were observed in areas of high relief. A difference surface analysis showed H12496 to be on average 0.13 meters shoaler than H12317 with a standard deviation of 1.15 meters (Figure 19). 16H12496 junctions overview.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_Master.jpg17Junction between H12496 (blue) and H12317 (purple) on Chart 16594.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_17.jpg183 Dimensional view of area with the highest difference, exaggerated by a factor of 10.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_17_3D.jpg19Difference surface statistics between H12496 and H12317 CUBE depth layers (8m combined surfaces). H12496 is on average 0.13 meters shoaler.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_17_Stats.jpgH12495400002012NOAA Ship RAINIERNThe junction overlap with H12317 was 50 to 750 meters wide along the northern border of H12496 (Figure 20). A difference surface analysis showed H12496 to be on average 0.06 meters shoaler than H12495 with a standard deviation of 0.18 meters (Figure 21).20Junction between H12496 (blue) and H12495 (purple) in meters on Chart 16594.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_95.jpg21Difference surface statistics between junction of H12496 and H12495 4-meter surfaces. H12496 is on average 0.06 meters shoalerfile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_95_Stats.jpgH12512400002012NOAA Ship RAINIERSThe junction overlap with H12317 was 50 to 300 meters wide along the western border of H12496 (Figure 22). A difference surface analysis showed H12496 to be on average 0.01 meters shoaler than H12512 with a standard deviation of 0.15 meters (Figure 23).22Junction between H12496 (blue) and H12512 (purple) in meters on Chart 16594.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_12.jpg23Difference surface statistics between junction of H12496 and H12512 4-meter surfaces. H12496 is on average 0.01 meters shoaler.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Junction_12_Stats.jpgSonar system quality control checks were conducted as detailed in the quality control section of the DAPR.None ExistThere were no conditions or deficiencies that affected equipment operational effectiveness.Surface Sound Velocity Surface sound velocity values were observed to vary temporally and spatially throughout the survey area, with the most extreme variations being near freshwater sources such as in lower Sharatin Bay and lower Anton Larsen Bay. Despite increasing the frequency at which CTD casts were conducted (in one instance up to twelve casts in a single day), the presence of a highly dynamic environment with respect to surface sound velocity (measuring changes approaching 50 meters/second) made it difficult to properly model the water column. This directly resulted in sound speed artifacts in the form of the outerbeams vacillating up and down (Figure 24 left). Figure 24 (right) shows the surface sound velocity values collected by the SV 71 and how the large range of values affected the gridded data. Additional data was collected on the last day of acquisition (DN298) in lower Sharatin Bay in an effort to minimize the effect of highly refracted outer beams. Due to time constraints, additional data was not collected in lower Anton Larsen Bay. Heavily refracted data in this area where the outer beams were 0.50 meters below the suspected seafloor was rejected per guidance of the Hydrographic Surveys Division (see Supplemental Correspondence - Rejection of Refracted data.jpg), which resulted in a 600 by 50 meter holiday (Figure 25).24Overview of lower Sharatin Bay. Gridded bathymetry from DN294 (left). Grid of surface sound velocity from SV71 on DN294 (right).file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_SSVS_Issues.jpg25Subset of rejected data in Anton Larsen Bay.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Trench_Subset.jpgIce FormationOn DN297 and DN298, ice formation caused by the presence of a fresh water lens and freezing temperatures was observed throughout Anton Larsen Bay. Ice was most thick in the morning, along the shore, and in the western arm of the bay but would mostly melt by the end of day. Thicknesses were observed to be roughly 20-40 centimeters. Noise introduced to the water column through the action of an aluminum hull breaking ice caused numerous data blow-outs. Data in these areas was heavily cleaned to eliminate fliers from grids (Figure 26). Efforts were made to break up the ice in areas of significant thickness before acquiring data. Additionally, the quality filter within the Reason SeaBat software was used to reject data that failed collinearity or brightness. 26Subset of area in Anton Larsen Bay that was heavily cleaned.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_IceFormation.jpgWater Level-Induced Vertical OffsetsThe tide stations used as a reference for reduction of soundings to Mean Lower Low Water (MLLW) for H12496 included a primary gauge (Kodiak Island, AK) and two subordinate gauges (Dovolno Point and Nachalni Island). Even with a tide gauge network, storms and localized currents caused variations that were difficult to model due to the complexity of the many bays present in the area. To quantify the water level errors, all lines from H12496 were referenced to ellipsoidal height based on WGS84 (ITRF00). A surface was created from the ellipsoidally-referenced lines, and differenced with the original tidal surface. This difference surface is shown in Figure 27, where differences are colored by their divergence from the mean. Disregarding the inherent geoidal slope, the localized patterns show the effects of tides and currents. Water level effects can be seen between data collected on different days as well as over the course of a single day of acquisition. This is especially evident for the crosslines in Anton Larsen Bay, where a 20 centimeter vertical offset in data referenced to MLLW is eliminated when referenced to the ellipse (Figure 29). Note: SBETs could not be applied for four survey lines and therefore could not be referenced to the ellipse. For this reason, the lines were excluded from the comparison resulting in gaps in the difference surface. See Section B.3.1 Corrections to Echo Soundings.27Comparison of tidally-referenced surface to ellipsoidally-referenced surface.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Tidal_vs_Ellipse.jpg28Histogram of comparison between tidal surface and ellipsoidal surface.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Tidal_vs_Ellipse_stats.jpg29Crossline acquired by 2803 on DN298 that shows a tide artifact that caused a vertical offset in Anton Larsen Bay.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Tidal_Offest.jpgSound speed profiles were acquired on all survey launches using the SBE-19 and SBE-19 Plus CTDs at discrete locations within the survey area approximately once every four hours, when surveying in a new area, or even more frequently when measured surface sound speed was observed to change due to fresh water inputs. Sound speed profiles were acquired on S221 (RAINIER) using the Rolls Royce MVP200 about every 15 minutes.Casts were concatenated into one file for each vessel and applied to all lines using the "Nearest in distance within time (4 hours)" selection method.30Locations of CTD casts. The western-most cast south of Talnik Pt that falls outside of survey limits was from survey H12512 but was utilized in the processing of H12496 (see Separates I- Logs). file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_CTD_Casts.jpgAll equipment and survey methods were used as detailed in the DAPR.Due to a logging failure, the TrueHeave file for line 2803_2012RA2981935 on DN298 was unavailable. Instead, only the heave logged in real-time was applied to the line. The affected data was examined in CARIS Subset Editor and no artifacts are present among overlapping lines.All sounding systems were calibrated as detailed in the DAPR.Backscatter was logged as a 7k or .all file and submitted to NGDC. Backscatter is not included with the data submitted to the Branch.NOAA Catalogue Control Version 5.2 and NOAA Profile Product Version 2.0.H12496_1mCUBE1-2142NOAA_1mComplete MBESH12496_2mCUBE2-2142NOAA_2mComplete MBESH12496_4mCUBE4-2142NOAA_4mComplete MBESH12496_8mCUBE8-2142NOAA_8mComplete MBESH12496_1m_-2to20_FinalCUBE1-220NOAA_1mComplete MBESH12496_2m_18to40_FinalCUBE21840NOAA_2mComplete MBESH12496_4m_36to80_FinalCUBE43680NOAA_4mComplete MBESH12496_8m_72to160_FinalCUBE872160NOAA_8mComplete MBESH12496_8m_CombinedCUBE8-2142NOAA_8mComplete MBESMultibeam data above 0 meters referenced to MLLW was retained in all surfaces per guidance from Pacific Hydrographic Branch (see Supplemental Correspondence- Negative_Depths.jpeg).Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.Mean Lower Low WaterTCARIKodiak Island945-7292Nachalini Island945-7407Vicinity of Dovolno Point945-73939457292.tidFinal Approved9457393.tidFinal Approved9457407.tidFinal ApprovedP136RA2012_Final.tcFinal2012-10-252013-01-13North American Datum of 1983 (NAD83)Smart BaseAkhiokCorpAK2005AC02CAPDOUGLASAK2007AC08Ushagat_IsAK2008AC18OldHarbor_AK2006AC34QUARTZ_CRKAK2005AC38SHUYAKISSPAK2006 AC39PILLARMTN_AK2006AC67KODIAK 5KOD5KODIAK 6KOD6Whale IslandNAApplanix POSPac software was used to produce a Smoothed Best Estimate of Trajectory (SBET) file. The SBET file consists of GPS position and attitude data corrected and integrated with inertial measurements and reference station correctors, exported into NAD83. The SBET was created using the Applanix proprietary “SmartBase” algorithm, which generates a Virtual Reference Station (VRS) on site from a network of established reference stations surrounding the project area, generally the Continually Operating Reference Station (CORS) network. For further details on the CORS network, refer to the accompanying HVCR. These SBET navigation and attitude files were applied to all lines in CARIS and superseded initial positioning and attitude data; with the exception of S221, in which only the positioning data was post-processed (real-time attitude was retained).Kodiak, AK (313 kHz)SBET Navigation/Attitude FilesSBETs were not applied to the following lines: 2803 DN292 lines 2803_2012RA2922122 and 2803_2012_RA2922105, 2803 DN298 line 2803_2012RA2981935, and 2804 DN295 line 2804_2012RA2960013. This was due to satellite dropout during corresponding times of acquisition. Navigation files were trimmed in Applanix POSPac software causing data gaps in SBETs corresponding with times of acquisition. The affected data was examined in CARIS Subset Editor and no artifacts are present among overlapping lines.SBET RMS FilesA 'script execution failed' error was received when SBET RMS files were loaded and therefore were not applied to the following lines: 2803 DN291 line 2803_2012RA2912359, 2803 DN292 line 2803_2012RA2922122, 2803 DN295 line 2803_2012RA2960000, 2803 DN 296 lines 2803_2012RA2970205 and 2803_2012RA2970219, and 2804 DN295 line 2804_2012RA2960013.16594255378900131998-042012-11-272012-12-01A comparison was performed between survey H12496 and Chart 16594 (1:78,900) using a CARIS sounding and contour layer, CARIS Tool Tip, and CARIS Subset Editor. Figure 31 shows generally where areas have shoaled or deepened by at least 2 fathoms. Soundings were created from MBES data in locations of charted soundings. Comparisons that were two fathoms shoaler or deeper were noted. Soundings that had shoaled or deepened were generalized into areas. The charted (16594) 10-fathom contour was compared to a green H12496 contour where soundings were shown to be in close agreement with the chart (Figures 32 and 33). A charted 3-fathom contour was compared with data from H12496; the actual 3-fathom contour is located at the junction between the gray and red depth ranges shown in Figures 32 and 33. Two locations where found to have shoaled to less than ten fathoms in areas out outside of the charted 10-fathom contour (Figure 34). Both areas will require a new charted 10-fathom contour. Two sounding point features (SOUNDG) were created in the Final Feature File for reference. It is recommended that H12496 data supersede all charted depths. Description of specific feature investigations and shoreline data are included in the Final Feature File.31Chart comparison between survey H12496 and Chart 16594.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Chart_Comparison.jpg32H12496 green sounding and contour layers over Chart 16594.file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Chartcomparison_DD.jpg33H12496 green sounding and contour layers over Chart 16594. file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Chartcomparison_EE.jpg34H12496 shoal soundings. file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_ShoalSoundings.jpgUS4AK5PE7890042011-07-132011-07-13trueENC US4AK5PE coincides with raster 16594. The depths and contours on the ENC match the raster and the comparison between survey H12496 and the ENC is equivalent to the preceding comparison with Chart 16594.No AWOIS items exist for this survey.No charted features exist for this survey.No uncharted features exist for this survey.No Danger to Navigation Reports were submitted for this survey. All shoal and hazardous features were investigated in accordance with the Project Instructions and the HSSDM and are addressed in the Final Feature File.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.Shoreline was investigated in accordance with the Project Instructions and the HSSDM.Prior survey comparisons exist for this survey, but were not investigated.Aids to navigation (ATONs) do not exist for this survey.Overhead features do not exist for this survey.Submarine features do not exist for this survey.The Homer-to-Port Lions Ferry crosses through the Southwestern corner of survey H12495 twice a week (Figure 55).35H12496 ferry routes. file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Data_to_Submit_DO_NOT_USE/Processed/Multimedia/H12496_Ferry_Routes.jpgNo platforms exist for this survey.No significant features exist for this survey.There is no present or planned construction or dredging within the survey limits.No new surveys or further investigations are recommended for this area.No new insets 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 and Specifications Deliverables Manual, 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 Descriptive Report.Richard T. Brennan, CDR/NOAACommanding Officer2012-12-04Michael O. Gonsalves, LT/NOAAField Operations Officer2012-12-04James B. JacobsonChief Survey Technician2012-12-04John R. Kidd, ENS/NOAASheet Manager2012-12-04file:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/IV%20Tides_and_Water_Levels/Request%20for%20Final%20Approved%20Water%20Levels/Fwd_%20Final%20Tides%20Request%20H12496%20(OPR-P136-RA-12).pdffile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/IV%20Tides_and_Water_Levels/Request%20for%20Final%20Approved%20Water%20Levels/H12496_RequestforTides.midfile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/IV%20Tides_and_Water_Levels/Request%20for%20Final%20Approved%20Water%20Levels/H12496_RequestforTides.miffile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/IV%20Tides_and_Water_Levels/Request%20for%20Final%20Approved%20Water%20Levels/H12496_RequestforTides.pdffile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/IV%20Tides_and_Water_Levels/Request%20for%20Final%20Approved%20Water%20Levels/H12496_RequestforTides.zipfile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/IV%20Tides_and_Water_Levels/Final%20Approved%20Water%20Levels/Final%20Tide%20Notes%20for%20OPR-P136-RA-2012,%20H12495,%20H12496%20and%20H12512.pdffile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/IV%20Tides_and_Water_Levels/Final%20Approved%20Water%20Levels/H12496.pdffile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/V%20%20Supplemental_Correspondence/Rejection%20of%20Refracted%20data.jpgfile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/V%20%20Supplemental_Correspondence/8125%20density.pdffile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Surveys/H12496/Descriptive_Report/Appendices/V%20%20Supplemental_Correspondence/Re_%20Negative%20depths.pdffile:///H:/OPR-P136-RA-12_N_Kodiak/H12496/Acquisition_Logs/H12496_2801__Acquisition_Log.xlsmfile:///H:/OPR-P136-RA-12_N_Kodiak/H12496/Acquisition_Logs/H12496_2802_Acquisition_Log.xlsmfile:///H:/OPR-P136-RA-12_N_Kodiak/H12496/Acquisition_Logs/H12496_2803_Acquisition_Log.xlsmfile:///H:/OPR-P136-RA-12_N_Kodiak/H12496/Acquisition_Logs/H12496_2804_Acquisition_Log.xlsxfile:///H:/OPR-P136-RA-12_N_Kodiak/H12496/Acquisition_Logs/H12496_S221_Acquisition_Log.xlsmfile:///I:/SVP/H12496/2801(RA-4)/H12496_2801.svpfile:///I:/SVP/H12496/2802(RA-5)/H12496_2802_SV.svpfile:///I:/SVP/H12496/2803(RA-3)/H12496_2803_concat.svpfile:///I:/SVP/H12496/2804(RA-6)/2012_2804.svpfile:///I:/SVP/H12496/S221/H12496_S221.svpfile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Project%20Instructions/Final_OPR-P136-RA-12_NorthCoastofKodiakIsland_ProjectInstructions_signed.pdffile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Project%20Instructions/OPR-P136-RA-12_ProjectInstructions.xmlfile:///K:/Projects/2012_Projects/OPR-P136-RA-12_North%20Coast%20of%20Kodiak%20Island/Project%20Instructions/OPR-P136-RA-12_RA-12-03_Correction_Memo_signed.pdf