Bathymetric Terrain Model of the U.S. Atlantic Margin (100-meter resolution) compiled by the U.S. Geological Survey (32-bit GeoTIFF, MERCATOR Projection, WGS 84)

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Frequently anticipated questions:


What does this data set describe?

Title:
Bathymetric Terrain Model of the U.S. Atlantic Margin (100-meter resolution) compiled by the U.S. Geological Survey (32-bit GeoTIFF, MERCATOR Projection, WGS 84)
Abstract:
Bathymetric terrain models of seafloor morphology are an important component of marine geological investigations. Advances in acquisition and processing technologies of bathymetric data have facilitated the creation of high-resolution bathymetric surfaces that approach the resolution of similar surfaces available for onshore investigations. These bathymetric terrain models provide a detailed representation of the Earth's subaqueous surface and, when combined with other geophysical and geological datasets, allow for interpretation of modern and ancient geological processes.
  1. How might this data set be cited?
    U.S. Geological Survey, 2016, Bathymetric Terrain Model of the U.S. Atlantic Margin (100-meter resolution) compiled by the U.S. Geological Survey (32-bit GeoTIFF, MERCATOR Projection, WGS 84): Open-File Report 2012-1266, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Andrews, Brian D., Chaytor, Jason D., Uri S. ten Brink, Brothers, Daniel S., Gardner, James V., Lobecker, Elizabeth A., and Calder, Brian R., 2016, Bathymetric Terrain Model of the Atlantic Margin for Marine Geological Investigations: Open-File Report 2012-1266, U.S. Geological Survey, Reston, Virginia.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -77.201194
    East_Bounding_Coordinate: -59.574633
    North_Bounding_Coordinate: 41.709069
    South_Bounding_Coordinate: 27.749491
  3. What does it look like?
    http://pubs.usgs.gov/of/2012/1266/GIS/grid/AMBath100m_V2.jpg (JPEG)
    Thumbnail image of gridded bathymetry from the Atlantic Margin.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 10-Mar-1990
    Ending_Date: 28-Aug-2015
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 9924 x 11993 x 1, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      The map projection used is Mercator.
      Projection parameters:
      Standard_Parallel: 40.000000
      Longitude_of_Central_Meridian: -72.000000
      False_Easting: 0.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 100.000000
      Ordinates (y-coordinates) are specified to the nearest 100.000000
      Planar coordinates are specified in meters
      The horizontal datum used is GCS_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257220.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Instantaneous sea level
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Value
    Depth in meters referenced to instantaneous sea level. (Source: Esri)
    Entity_and_Attribute_Overview:
    Bathymetric depth values in Esri Raster format. Data values represent depths in meters referenced to instantaneous sea level.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
    U.S. Geological Survey
  3. To whom should users address questions about the data?
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov

Why was the data set created?

The purpose of this bathymetric terrain model is to provide a high-quality bathymetric surface of the Atlantic margin of the United States for current and future geological investigations.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 03-Dec-2012 (process 1 of 14)
    Step 1. This step is the same for all surveys included in this grid except as noted for RB0904, NF-11-04-NC, MGL1512, NF1208_USGS, H12490, and H12491. Downloaded the raw data files from the National Centers for Environmental Information (NCEI) for each survey listed below. Line files are archived in the geographic coordinate system and loaded into CARIS HIPS (v. 7.1-9.0, Software was updated as new versions were available over the course of this project). All surfaces created in HIPS used a 100 meter grid cell resolution and the Mercator projection with a central longitude of 72.0 degrees West, and a latitude of true scale of 45.0 degrees North that is more suitable for the spatial extent of this project than the geographic coordinate system.
    Where:
    Survey=Cruise Name
    Source=the address of the National Centers for Environmental Information archive location where raw data were downloaded.
    Download Date=The calendar date the raw data were downloaded.
    Download Format= the version of MB-System format of the data downloaded.
    Output Surface= The name of the final CARIS surface (in .csar format) that was used in the combine function.
    Surface Creation Date= the calendar date the latest surface was created for input to the combine function.
    
    If any edits were made to a surface, it is rebuilt, interpolated, and a new creation data is recorded. Format = YYYYMMDD Surveys in Version 1 (ambath100) that are included in Version 2 (AMBath100m_V2.tiff). These data are included in "AtlanticMarginOFRBath100m5Feb13.csar" described in processing step 7 below.
    
    
    VERSION EXPLANATION: The follwing surveys are included in Version 1 of this grid, but were superceded with newer, higher resolution dat in Version 2: B00218, B00219, B00220, B00308, B00309. The Surveys listed below were included in Version 1 and are also included in Version 2. Some of the surveys were updated for version 2 to either include additional lines from the same survey, that are now with in the larger extent covered by version 2, or further edited to improve data quality. An explantion of updated surfaces are included with each updated entry below.
    
    Survey: B00213
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/whiting/B00213/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb15
    Output Surface: B00213_100mInterp.csar
    Surface Creation Date: 20120727
    
    Survey: B00214
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/whiting/B00214/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb15
    Output Surface: B00214_100mInterp.csar
    Surface Creation Date: 20120720
    
    Survey: B00215
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/whiting/B00215/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb15
    Output Surface: B00215_100mInterp.csar
    Surface Creation Date: 20120720
    
    Survey: B00310
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/mt._mitchell/B00310/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb15
    Output Surface: B00310_BEUTM_100m_Interp.csar
    Surface Creation Date:20120720
    
    Survey: B00221
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/mt._mitchell/B00221/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb15
    Output Surface: B00221_100mInterp5x5.csar
    Surface Creation Date:20120720
    
    Survey:HEN04-1
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/henson/HEN04-1/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb51
    Output Surface: Hen01Merc72_100m_Interp.csar
    Surface Creation Date:20121218
    
    Survey: HEN04-2. This surface was updated for version 2 to include portions of lines south of Buell Seamount that were downloaded in 2012, but not >>>included in version 1.0 of the data.
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/henson/HEN04-2/multibeam/data/version1/MB/
    Download Date: 20120705
    Download Format: mb51
    Output Surface: Henson04_02_100m_Interp.csar (v. 1)
    Surface Creation Date:20121220
    Output Surface: Henson04_02_100mInterpV2.csar (v. 2)
    Surface Creation Date: 20151026
    
    Survey: PF0501. This survey has two seperate surveys areas (north and south). The northern section was included in version 1 and updated to include >missing portion at end of line "Atlantic_line_287_raw.all". The southern survey area (south), was not included in version 1, but is included in version 2.
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/pathfinder/PF0501/multibeam/data/version1/MB/
    Download Date: 20120731
    Download Format: mb15
    Output Surface: PF0501_IntV2100m.csar (north)
    Output Surface: PF0501S_InterpV2.csar (south)
    Surface Creation Date: 20130110  (north)
    Surface Creation Date: 20150211  (south)
    
    Survey: HEN04-3
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/henson/HEN04-3/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb51
    Output Surface:Hen04_3Merc72_100m_Interp.csar
    Surface Creation Date:20121218
    
    Survey: KN178
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/knorr/KN178/multibeam/data/version1/MB/
    Download Date: 20061219
    Download Format: mb41
    Output Surface: KN178_Merc100BE.csar
    Surface Creation Date: 20130108
    
    Survey: RB0904
    Source:  USGS participated on this survey and accessed raw data directly from ship.
    USGS archived data with NCEI 201302 address:http://surveys.ngdc.noaa.gov/mgg/MB/ocean/ronald_h._brown/RB0904/multibeam/data/version1/MB/
    Download Date: N/A did not download from NCEI
    Output Surface: RB09_BEMerc100m_Interp.csar
    Creation Date: 20130108
    
    Survey: EX1106
    Source:http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1106/multibeam/data/version1/MB/
    Download Date: 20110920
    Output Surface: EX1106_Merc100m.csar (v. 1) This surface was updated for version 2 to included lines that extend further south in the area of the Cape Fear Landslide.
    Surface Creation Date:20120822
    Output Surface: EX1106_V2.csar (v. 2)
    Surface Creation Date: 20152312
    
    Survey: EX1201
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1201/multibeam/data/version1/MB/
    Download Date:20120501
    Output Surface: EX1201_BEMerc100m.csar (v 1). This surface was updated for version 2 to included lines that extend further south in the area of the >Cape Fear Landslide .
    Surface Creation Date: 20130103
    Output Surface: EX1201_BlakeV2.csar (v 2)
    Surface Creation Date: 20152312
    
    Survey: EX1204
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1204/multibeam/data/version1/MB/
    Download Date: 20121004
    Output Surface: OE_EX1204_Merc100mBE.csar
    Surface Creation Date:20121120
    
    Survey: NF-11-04-NC
    Source: USGS participated on this survey and accessed raw data directly from ship.
    
    USGS archived data with NGDC 201302. http://surveys.ngdc.noaa.gov/mgg/MB/ocean/nancy_foster/NF-11-04-NC/multibeam/data/version1/MB/em1002/
    Download Date: N/A
    Output Surface: NF1104_BEMerc100m.csar
    Surface Creation Date:20111126
    
    Survey: NF1208_USGS
    Source: USGS participated on this survey and accessed raw data directly from ship.
    USGS archived data with NGDC 201302. http://surveys.ngdc.noaa.gov/mgg/MB/ocean/nancy_foster/NF1208_USGS/multibeam/data/version1/MB/
    Download Date:N/A
    Output Surface: NF1208_100mBEMerc.csar
    Surface Creation Date: 20121126
    
    
    NEW SURVEYS INCLUDED IN VERSION 2.0
    
    Survey: KNOX17RR
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/roger_revelle/KNOX17RR/multibeam/data/version1/MB/
    Download Date:20120831
    Download Format:mb56
    Output Surface: KNOX17RR_Merc100mOFRINterp2.csar
    Surface Creation Date: 20151026
    
    Survey: PF0502
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/pathfinder/PF0502/multibeam/data/version1/MB/
    Download Date:20130110
    Download Format: mb51
    Output Surface: PF0502_V2.csar
    Surface Creation Date: 20151026
    
    Survey: RB1202
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/pathfinder/PF0502/multibeam/data/version1/MB/
    Download Date:20120911
    Download Format: mb58
    Output Surface: RB1202_InterpV2.csar
    Surface Creation Date: 20151026
    
    Survey: EX1205L1
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1205L1/multibeam/data/version1/MB/
    Download Date:20120723
    Download Format: mb58
    Output Surface:EX1205_L1_V2.csar
    Surface Creation Date: 20150928
    
    Survey: EX1205L2
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1205L2/multibeam/data/version1/MB/
    Download Date:20120724
    Download Format: mb58
    Output Surface:EX1205_L2_OFR.csar
    Surface Creation Date: 20150928
    
    Survey: EX1206
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1206/multibeam/data/version1/MB/
    Download Date:20130124
    Download Format: mb58
    Output Surface: EX1206_V2_100mInterp.csar
    Surface Creation Date: 20150520
    
    Survey: EX1301
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1301/multibeam/data/version1/MB/
    Download Date:20120620
    Download Format: mb58
    Output Surface: EX1301_100mV2.csar
    Surface Creation Date:20150504
    
    Survey: EX1302
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1302/multibeam/data/version1/MB/em302/
    Download Date:20140319
    Download Format: mb58
    Output Surface: EX1302_100m_V2.csar
    Surface Creation Date:20150501
    
    Survey: EX1303
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1303/multibeam/data/version1/MB/em302/
    Download Date:20140328
    Download Format: mb58
    Output Surface: EX1303_100m_V2Interp3_5_5.csar
    Surface Creation Date:20150929
    
    Survey: EX1304Leg1
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1304Leg1/multibeam/data/version1/MB/em302/
    Download Date:20140402
    Download Format: mb58
    Output Surface: EX1304_L1_MercV2.csar
    Surface Creation Date:20150519
    
    Survey: EX1304Leg2
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1304Leg2/multibeam/data/version1/MB/em302/
    Download Date:20140409
    Download Format: mb58
    Output Surface: EX1304L2_100m_MercInterpV2.csar
    Surface Creation Date:20151028
    
    Survey: EX1403
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1403/multibeam/data/version1/MB/em302/
    Download Date: 20150506
    Download Format: mb58
    Output Surface:EX1403_100m.csar
    Surface Creation Date: 20150929
    
    Survey: EX1404L1
    Source: http://surveys.ngdc.noaa.gov/mgg/MB/ocean/okeanos_explorer/EX1404L1/multibeam/data/version1/MB/em302/
    Download Date: 20150506
    Download Format: mb58
    Output Surface:EX1404_L1_100m.csar
    Surface Creation Date: 20150929
    
    Survey: MGL15-12
    Source: http://www.rvdata.us/catalog/MGL1512
    Download Date: 20151116
    Download Format: .all
    Output Surface: RBPFKN_MerComb100mV2.csar
    
    
    Survey: H12490
    Source: http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H12001-H14000/H12490/BAG/H12490_MB_16m_MLLW_combined.bag.gz
    Download Date: 20140404
    Download Format: bag
    Output Surface: H12490_MB_16m.bag
    Surface Creation Date: 20140404 (NOAA). Note: These data were collected to NOAA hydrographic standards and publicly distributed in Bathymetric >Attributed grid (.bag) format in the Universal Transverse Mercator Zone 18, WGS 84 horizontal coordinate system. The vertical reference system uses Mean Lower Low Water (MLLW). No further processing was conducted.
    
    Survey: H12491
    Source: http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H12001-H14000/H12491/BAG/H12491_MB_16m_MLLW_Combined.bag.gz
    Download Date: 20140404
    Download Format: bag
    Output Surface: H12491_MB_16m.bag
    Surface Creation Date: 20140404 (NOAA)  Note: These data were collected to NOAA hydrographic standards and publicly distributed in Bathymetric >Attributed grid (.bag) format in the Universal Transverse Mercator Zone 18, WGS 84 horizontal coordinate system. The vertical reference system uses Mean Lower Low Water (MLLW). No further processing was conducted
    
    Date: 26-Oct-2015 (process 2 of 14)
    Step 2. Combine the surveys from Ronald H. Brown, Pathfinder, and Roger Revelle into one surface using the "Start date is least" criteria using CARIS Base Editor (v. 4.1.14).The "Start date is least" criteria puts the surface with the oldest date of data collection on the bottom and newest data on top during the combine function. The combine criteria dictates the cell value that remains when two or more cells from different surfaces overlap. Person who carried out this activity:
    Brian Andrews NOTE: contact for processing steps is the same for all processing steps.
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov
    Data sources used in this process:
    • KNOX17RR_Merc100mOFRInterp2.csar
    • PF0501S_InterpV2.csar
    • PF0502_V2.csar
    • RB1202_InterpV2.csar
    Data sources produced in this process:
    • RBPFKN_MerComb100mV2.csar
    Date: 26-Oct-2015 (process 3 of 14)
    Step 3. Combine the surveys from the Henson (Hen04-02), Pathfinder (PF0501), into one surface using the "Start date is least" criteria using CARIS Base Editor (v. 4.1.14). These two surveys were updated in version 2 to included missing lines from previous version (Hen04-02:63mba04272_p_100.d03_mb121, PF0501:Atlantic_line_287_raw.all) Data sources used in this process:
    • Henson04_02_100mV2.csar
    • PF0501_IntV2100m.csar
    Data sources produced in this process:
    • HenPF_100mV2.scar
    Date: 28-Oct-2015 (process 4 of 14)
    Step 4. Combine the Okeanos Explorer surveys into one surface using the "start date is least" criteria using CARIS Base Editor (ver. 4.0.2.) The "Start date is greatest" criteria puts the surface with the oldest date of data collection on the bottom and newest data on top during the combine function. Data sources used in this process:
    • EX1205_L2_OFR.csar
    • EX1206_V2_100mInterp.csar
    • EX1301_100mV2.csar
    • EX1302_100m_V2.csar
    • EX1303_100m_V2Interp.csar
    • EX1304_L1_MercV2.csar
    • EX1304L2_100m_MercInterpV2.csar
    • EX1404_L1_100m.csar
    Data sources produced in this process:
    • OkeanosCombV2CDIG.csar
    Date: 04-Jan-2013 (process 5 of 14)
    Step 5: Combined Okeanos surveys with Hassler data using "creation date is greatest" criteria for the combine operation using CARIS Base Editor (ver. 4.0.2) The "Creation date is greatest" criteria puts the surface with the oldest date of data creation on the bottom and newest data on top during the combine function. Data sources used in this process:
    • OkeanosCombV2CDIG.csar
    • H12490_16m.bag
    • H12491_16m.bag
    Data sources produced in this process:
    • OECombFH100mV2.scar
    Date: 12-Sep-2015 (process 6 of 14)
    Step 6. Added MGL15 to RBPFKN_MercCombv2.csar Data sources used in this process:
    • RBPFKN_MerComb100mV2.csar
    • MGL1512_Merc100mInterp2.csar
    Data sources produced in this process:
    • RBPFKN_HenPFCombMGL.csar
    Date: 12-Nov-2015 (process 7 of 14)
    Step 7. Combine 3 surfaces. This step combines the new larger surveys in version 2, with the csar surface that was published in version 1 (AtlanticMarginOFRBath100m5Feb13.csar). Used the "Creation Date is Greatest" criteria during the combine function so that the new surveys for version 2 replaced data in version 1 that overlapped. Data sources used in this process:
    • RBPFKN_HenPFCombMGL.csar
    • OECombFH100mV2.scar
    • AtlanticMarginOFRBath100m5Feb13.csar
    Data sources produced in this process:
    • AtlanticMarginCombV2
    Date: 12-Nov-2015 (process 8 of 14)
    Step 8. Combine transit lines from several surveys in the area of Cape Fear to fill in small data gaps. EX1106.csar was updated from version 1 to version 2 to include portions of transit lines. Data sources used in this process:
    • EX1106.csar
    • EX1201_BlakeV2.csar
    • EX1403_100m.csar
    • EX1205_L1_V2.csar
    Data sources produced in this process:
    • CapeFearV2.csar
    Date: 12-Nov-2015 (process 9 of 14)
    Step 9. Combine CapeFearV2.csar with larger surface to produce final extent. Data sources used in this process:
    • CapeFearV2.csar
    • AtlanticMarginCombV2.csar
    Data sources produced in this process:
    • AtlanticMarginCombPF02_CFV2.csar
    Date: 05-Jan-2016 (process 10 of 14)
    Step 10. Fill in several no data gaps by extracting data and converting to a TIN. Using CARIS Base Editor (v. 4.1.14) Use the "Extract by Digitizing" feature from the tools menu to manually digitize polygons encompassing areas of no data. Using the "Create TIN" feature from the "Tools" menu, convert extracted suface (with holes), to a TIN (without holes). Finally convert the TIN (GapFillsTIN) to a surface (GapFills100mV2.csar) using the "Interpolate surface from TIN" context menu. The Natural Neighbors mehods was used to convert the TIN to a 100-m resolution csar surface. Data sources used in this process:
    • AtlanticMarginCombPF02_CFV2.csar
    • GapFillsExtract.csar
    Data sources produced in this process:
    • GapFillsTIN
    • GapFills100mV2.csar
    Date: 05-Jan-2016 (process 11 of 14)
    Step 11. Export surfaces from Base Editor as GeoTIFFs for merging in ArcMap. Using the "Export to Raster Product" from the file menu in Base Editor, export GapFills100mV2.csar and AtlanticMarginCombPF02_CFV2.csar to GeoTIFFs. Data sources used in this process:
    • AtlanticMarginCombPF02_CFV2.csar
    • GapFills100mV2.csar
    • AtlanticMarginCombPF02_CFV2.csar
    Data sources produced in this process:
    • AtlanticMargin_V2.tiff
    • GapFills100mV2.tiff
    Date: 05-Jan-2016 (process 12 of 14)
    Step 12. Merge gap fill surface into main surface (AtlanticMarginV2.tiff) in ArcMap using the "Mosaic" tool in ArcMap (v. 10.3.1). During the merge process, the "first" option was used for the "Mosaic Operator" so that the Main surface was on top, and the Gap Fills only filled areas of no data in main surface. Data sources used in this process:
    • AtlanticMargin_V2.tiff
    • GapFills100mV2.tiff
    Data sources produced in this process:
    • AtlanticMargin_V2.tiff
    Date: 05-Jan-2016 (process 13 of 14)
    Step 13. Fill in any remaining small holes using Raster Calculator and a 5x5 cell mean value filter ArcMap (v. 10.3.1) The original grid (AtlanticMargin_V2.tif) was converted to an 8-bit ArcRaster grid (BathMask) to use as a mask feature to constrain the mean filter. After filtering, the "shrink" tool was used to clip the filtered grid (ambathfilt5x5), back to the original boundary using "number of zones= 4" option. Data sources used in this process:
    • ambathfilt5x5.tif
    Data sources produced in this process:
    • AMBath100m_V2.tif
    Date: 20-Jul-2018 (process 14 of 14)
    USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    U.S. Geological Survey, 2016, AtlanticMarginBathSource_V2.shp:.

    Online Links:

    This is part of the following larger work.

    Andrews, Brian D., Chaytor, Jason D., Uri S. ten Brink, Brothers, Daniel S., Gardner, James V., Lobecker, Elizabeth A., and Calder, Brian R., 2016, Bathymetric Terrain Model of the Atlantic Margin for Marine Geological Investigations: Open-File Report 2012-1266, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Gardner, James V., 2004, U.S. Law of the Sea Cruise to Map the Foot of the Slope and 2500-m Isobath of the Northeast US Atlantic Continental Margin: Hen04-1, 2 and 3. Cruise Report: Cruise Report 1.0, University of New Hampshire (UNH), Durham, New Hampshire.

    Online Links:

    Gardner, James V., and Cartwright, Doug, 2004, U.S. Law of the Sea Cruise to Map the Foot of the Slope and 2500-m Isobath of the Northeast U.S. Atlantic Continental Margin: Legs 4 and 5: Cruise Report 1.0, University of New Hampshire (UNH), Durham, New Hampshire.

    Online Links:

    Calder, Brian R., and Gardner, James V., 2008, U.S. Law of the Sea Cruise to Map the Foot of the Slope of the Northeast U.S. Atlantic Continental Margin: Leg 6: Cruise Report 1.0, University of New Hampshire (UNH), Durham, New Hampshire.

    Online Links:

    Armstrong, Andrew A., Calder, Brian R., and Smith, Shepard M., 2012, U.S. Law of the Sea Cruise to Map the Foot of the Slope of the Northeast U.S. Atlantic Continental Margin: Leg7: UNH-CCOM/JHC Technical Report 1.0, University of New Hampshire (UNH), Durham, New Hampshire.

    Calder, Brian R., 2015, U.S. Law of the Sea Cruise to Map the Foot of the Slope of the Northeast U.S. Atlantic Continental Margin: Leg8: UNH-CCOM/JHC Technical Report 15-001 1.0, University of New Hampshire (UNH), Durham, New Hampshire.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    The horizontal accuracy of line files accessed from the Natioanal Centers for Environmental Information are not published with the line files. Most surveys were collected after 2004 used Differential Global Positioning System for navigation. Earlier surveys (B00213, B00214,B00215, B00221, and B00310) were collected using Starfix GPS. Horizontal accuracy for HEN04-1, HEN04-2, HEN04-3, PF0501, PF0502, KNOX17RR, and RB1202 are "Positioning is accurate to better than 5 meters (at 95% confidence)" as stated http://ccom.unh.edu/sites/default/files/metadata/Atlantic_ESRI_DTM_metadata.xml
  3. How accurate are the heights or depths?
    All bathymetric files were collected using Instantaneous Sea Level (except H12490 and H12491) and no additional tidal corrections were applied during import to CARIS HIPS (ver 7.1-9.02). Instantaneous sea level indicates that the data collected were not referenced to a tidal datum, rather that the depths represent a height that is dependent on the local sea level at that location and time. Vertical accuracy for HEN04-1, HEN04-2, HEN04-3, PF0501, PF0502, KNOX17RR, and RB1202 are "Depth errors (at the 95% confidence level) are smaller than 1% of the observed water depth as determined by crosslines" as stated http://ccom.unh.edu/sites/default/files/metadata/Atlantic_ESRI_DTM_metadata.xml
  4. Where are the gaps in the data? What is missing?
    This grid is a compilation of bathymetric data collected during 33 separate surveys conducted between 1990 and 2015. Data were collected using different vessels and sonars, however, they were processed and edited using the same methods detailed below. Data from these surveys collected outside the area of interest (transit lines etc.) may not be included in this grid. Small data gaps within each grid were interpolated (if needed) and then exported as a GeoTIFF. Small differences between data coverage in the GeoTIFF and the corresponding Source shapefile (AtlanticMarginBathSource_V2) may exist
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
These data are not for navigational use. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Use_Constraints: None
  1. Who distributes the data set? (Distributor 1 of 1)
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    bandrews@usgs.gov
  2. What's the catalog number I need to order this data set? AMBath100m_V2.zip: contains the 32-bit GeoTIFF (AMBath100m_V2.tiff), and TIFF world file, AMBath100m_V2.jpg browse graphic, and the associated FGDC metadata in xml, txt, HTML, and FAQ format.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data are available as 32-bit floating point GeoTIFF format. to utilize these data, the user must have software capable of uncompressing the WinZip file and viewing a GeoTIFF image.

Who wrote the metadata?

Dates:
Last modified: 20-Jul-2018
Metadata author:
Brian Andrews
U.S. Geological Survey
Geographer
384 Woods Hole Rd.
Woods Hole, MA
USA

508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/eastcoast/bathymetry/AMBath100m_V2.tif.faq.html>
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