Elevation artifacts in digital bathymetric and topographic models for United States east (east_cdem_v1.tif) and west (west_cdem_v.tif) coasts (polygon shapefile, geographic, NAD83)

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Frequently anticipated questions:

What does this data set describe?

Title:
Elevation artifacts in digital bathymetric and topographic models for United States east (east_cdem_v1.tif) and west (west_cdem_v.tif) coasts (polygon shapefile, geographic, NAD83)
Abstract:
Investigations of coastal change and coastal resources often require continuous elevation profiles from the seafloor to coastal terrestrial landscapes. Differences in elevation data collection in the terrestrial and marine environments result in separate elevation products that may not share a vertical datum. This data release contains the assimilation of multiple elevation products into a continuous digital elevation model at a resolution of 3-arcseconds (approximately 90 meters) from the terrestrial landscape to the seafloor for the contiguous U.S., focused on the coastal interface. All datasets were converted to a consistent horizontal datum, the North American Datum of 1983, but the native vertical datum for each dataset was not adjusted. Artifacts in the source elevation products were replaced with other available elevation products when possible, corrected using various spatial tools, or otherwise marked for future correction. This data release contains the assimilation of multiple elevation products into a continuous digital elevation model at a resolution of 3-arcseconds (approximately 90 meters) from the terrestrial landscape to the seafloor for the contiguous U.S. that were constructed using this shapefile.
  1. How might this data set be cited?
    Befus, Kevin M., and Kroeger, Kevin D., 2017, Elevation artifacts in digital bathymetric and topographic models for United States east (east_cdem_v1.tif) and west (west_cdem_v.tif) coasts (polygon shapefile, geographic, NAD83): data release DOI:10.5066/F7W37TGK, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details:
    The first link is to the publication landing page. The second link is to the page containing the data. And the final link is a direct link to download the data.
    This is part of the following larger work.

    Befus, Kevin M., and Kroeger, Kevin D., 2017, Continuous and optimized 3-arcsecond elevation model for United States east and west coasts: data release DOI:10.5066/F7W37TGK, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Befus, K.M., Kroeger, K.D., 2017, Continuous and optimized 3-arcsecond elevation model for United States east and west coasts: U.S. Geological Survey data release, https://doi.org/10.5066/F7W37TGK.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -124.007629
    East_Bounding_Coordinate: -65.257277
    North_Bounding_Coordinate: 49.014998
    South_Bounding_Coordinate: 24.282314
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/57ebe895e4b09082500ef4a8?name=cDEMartifacts_overview.png (PNG)
    Color image of the polygon shapefile used to correct the terrain model for contiguous U.S. marine coastlines. The source file is DEM_artifacts.shp associated with this data series.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2016
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Contiguous U.S. coastal areas and portions of Canada and Mexico
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (92)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal seconds. The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.2572221.
  7. How does the data set describe geographic features?
    DEM_artifacts
    polygon shapefile delineating artifacts identified in analysis. (Source: USGS)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Type
    The type of elevation artifact delineated. (Source: USGS)
    ValueDefinition
    MergingA previous or current location in the DEM where merging other datasets resulted in an obvious and unrealistic offset in elevation at the merging location.
    ChannelA channel artifact that may be related to merging but was treated differently than other merging artifacts.
    InterpAn interpolation artifact that may or may not be fixed in the east_ and west_cdem_v1 likely related to sparse data in the input DEMs or are an artifact of the creation of those source DEMs
    DEMname
    Names of source and product DEMs that contain the artifact delineated by the current feature. These are the source contribution filenames. (Source: USGS, NOAA) character set
    Loc
    The location of the artifact relative to land. (Source: USGS)
    ValueDefinition
    offshoreElevation values outlined by the feature are predominantly less than 0 meters.
    terrestrialElevation values outlined by the feature are predominantly greater than 0 meters.
    bothElevations values are greater than 0 meters as well as less than or equal to 0 meters. The artifact extends from offshore to on shore.
    Action
    An action flag used to specify how artifacts should be corrected for the DEM in DEMname. Empty entries exist only for Type=Merging and indicate no additional processing flag for merging-type corrections, but that the correction should be applied (i.e., not "future"). (Source: USGS)
    ValueDefinition
    futureNo action taken in current procedure but can be corrected in the future with additional data or data operations.
    fillA flag used in the creation of the elevation product indicating areas to extract after an ArcGIS 10.3 Spatial Analyst/Hydrology/Fill tool is run.
    higherA flag used in the creation of the elevation product indicating a higher elevation threshold than 0 meters is needed.
    replaceFeatures outline data to be replaced entirely by the dataset in the ActDEM field.
    ActDEM
    Names of source and temporary elevation products that contain the data to correct the artifact delineated by the current feature. ActDEM only has a value when attribute Action is to "replace". No value is entered and ActDEM is left blank where no additional dataset was used to correct an artifact or the correction can be made in the future. (Source: USGS) character set

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Kevin M. Befus
    • Kevin D. Kroeger
  2. Who also contributed to the data set?
    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  3. To whom should users address questions about the data?
    Kevin D. Kroeger
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2270 (voice)
    kkroeger@usgs.gov

Why was the data set created?

The purpose of this dataset is to identify and correct elevation artifacts in the source elevation datasets that can be corrected in future products or were corrected. These artifacts are assigned a Type and Action attribute that is used to correct the source datasets where possible using the processing steps for creating the west_cdem_v1.tif and east_cdem_v1.tif rasters. The primary focus of the artifact delineation was between -50 to 50 meters elevation. Only those interpolation artifacts that could be replaced by other data, were unavoidable/unfillable using other datasets, or were distinguishable from nearby bathymetry or topography were delineated and saved in DEM_artifacts.shp.

How was the data set created?

  1. From what previous works were the data drawn?
    south_padre_tx_1-3_arc-second_navd88.asc (source 1 of 14)
    Grothe, P.G., Taylor, L.A., Eakins, B.W., Carignan, K.S., Friday, D.Z., and Love, M., 2012, South Padre Island, TX 1/3 arc-second NAVD 88 DEM: NOAA, NOAA National Geophysical Data Center Boulder, CO.

    Online Links:

    Other_Citation_Details:
    The vertical datum for the data is NAVD 88. The horizontal datum for the data is WGS 1984. The original cell-size is 1/3-arcsecond.
    Type_of_Source_Media: Raster
    Source_Contribution:
    Full dataset used to replace overlaping data in western_gom_crm_v1.
    cape_hatteras.asc (source 2 of 14)
    Taylor, L.A., Eakins, B.W., Carignan, K.S., Warnken, R.R., Schoolcraft, D.C., and Sharman, G.F., 2008, Cape Hatteras, NC 1/3 arc-second MHW DEM: NOAA, NOAA National Geophysical Data Center Boulder, CO.

    Online Links:

    Other_Citation_Details:
    The vertical datum for the data is the mean height of water (MHW). The horizontal datum for the data is WGS 1984. The original cell-size is 1/3-arcsecond. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    The cape_hatteras data were used to replace se_atl_crm_v1 for an area outlined by a feature in DEM_artifacts.shp covering the upper Gulf of Maine in one feature south of Cape Hatteras, North Carolina.
    northern_gulf_coast_navd_88.grd (source 3 of 14)
    Love, M.R., Amante, C.J., Eakins, B.W., and Taylor, L.A., 2012, Northern Gulf Coast, LA/MS/FL/AL 1 arc-second NAVD 88 DEM: U.S. Dept. of Commerce, Boulder, CO.

    Online Links:

    Other_Citation_Details:
    The vertical datum for the data is NAVD 88. The horizontal datum for the data is WGS 1984. The original cell-size is 1-arcsecond.
    Type_of_Source_Media: Raster
    Source_Contribution:
    Full dataset was used to replace overlapping data in central_gom_crm_v1 except for areas in Vdatum_NGulfCoast indicated with type=Replace in DEM_artifacts.shp.
    gom03_v1_0.tif (source 4 of 14)
    Twomey, E.R., and Signell, R.P., 2013, Construction of a 3-Arcsecond Digital Elevation Model for the Gulf of Maine: U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Other_Citation_Details:
    The vertical datum for the data is NAVD 88. The horizontal datum for the data is NAD 1983. The original cell-size is 3-arcseconds.
    Type_of_Source_Media: Raster
    Source_Contribution:
    The gom03_v1_0.tif data were used to replace ne_atl_crm_v1 for areas outlined by two features in DEM_artifacts.shp covering the upper Gulf of Maine in one feature and Martha's Vinyard and Nantucket Islands in the other.
    ne_atl_crm_v1.flt (source 5 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Northeast Atlantic: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 3-arcseconds. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    All of the ne_atl_crm_v1 dataset was used for outlining artifacts in DEM_artfacts.shp. Only cells with an elevation equal to or less than 0 meters in the dataset datum were retained in the final topographic and bathymetry product. ne_atl_crm_v1 data were not directly used for areas with merging type artifacts or where other elevation data were used to replace ne_atl_crm_v1 data, outlined in DEM_artifacts.shp.
    se_atl_crm_v1.flt (source 6 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Southeast Atlantic: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 3-arcseconds. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    All of the se_atl_crm_v1 dataset was used for outlining artifacts in DEM_artfacts.shp. Only cells with an elevation equal to or less than 0 meters in the dataset datum were retained in the final topographic and bathymetry product. se_atl_crm_v1 data were not directly used for areas with merging type artifacts or where other elevation data were used to replace se_atl_crm_v1 data, outlined in DEM_artifacts.shp.
    fl_east_gom_crm_v1.flt (source 7 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Florida and Eastern Gulf of Mexico: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 3-arcseconds. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    No significant artifacts were found in fl_east_gom_crm_v1.flt. Only cells with an elevation equal to or less than 0 meters in the dataset datum were retained in the final topographic and bathymetry product.
    central_gom_crm_v1.flt (source 8 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Central Gulf of Mexico: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 3-arcseconds. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    All of the central_gom_crm_v1 dataset was used for outlining artifacts in DEM_artfacts.shp. Only cells with an elevation equal to or less than 0 meters in the dataset datum were retained in the final topographic and bathymetry product. central_gom_crm_v1 data were not directly used for areas with merging type artifacts or where other elevation data were used to replace central_gom_crm_v1 data, outlined in DEM_artifacts.shp.
    western_gom_crm_v1.flt (source 9 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Western Gulf of Mexico: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 3-arcseconds. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    All of the western_gom_crm_v1 dataset was used for outlining artifacts in DEM_artfacts.shp. Only cells with an elevation equal to or less than 0 meters in the dataset datum were retained in the final topographic and bathymetry product. western_gom_crm_v1 data were not directly used for areas with merging type artifacts or where other elevation data were used to replace western_gom_crm_v1 data, outlined in DEM_artifacts.shp.
    southern_calif_crm_v2_netcdf.zip (source 10 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Southern California Version 2: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 1-arcsecond. Note that the data files for this reference were a zipped directory containing .grd format rasters, but the linkage incorrectly indicated the data were in NetCDF format on the retrieval date. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    All of the .grd files in the .zip were merged into a topography and bathymetry product. Elevations less than or equal to 0 meters were used to create the final elevation model.
    central_pacific_crm_v1.flt (source 11 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Central Pacific: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 3-arcseconds. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    All of the central_pacific_crm_v1 dataset was used for outlining artifacts in DEM_artfacts.shp. Only cells with an elevation equal to or less than 0 meters in the dataset datum were retained in the final topographic and bathymetry product. central_pacific_crm_v1 data were not directly used for areas with merging or channel type artifacts nor where other elevation data were used to replace central_pacific_crm_v1 data, outlined in DEM_artifacts.shp.
    nw_pacific_crm_v1.flt (source 12 of 14)
    NOAA National Centers for Environmental Information, unknown, US Coastal Relief Model - Northwest Pacific: NOAA, National Oceanic and Atmospheric Administration National Centers for Environmental Information.

    Online Links:

    Other_Citation_Details:
    The vertical datum was not specified in the creation of the dataset from multiple bathymetric products with variable tidal datums. The large spatial resolution leads to cells that span elevations equivalient to the datum uncertainty introduced by the tidal range, making the specification of a vertical datum from a mean tidal position impossible. The horizontal datum is NAD 1983. The original cell size is 3-arcseconds. Original disclaimer: "THIS DATA IS NOT TO BE USED FOR NAVIGATION. Although these data are of high quality and useful for planning and modeling purposes, they do not necessarily reflect current conditions, nor do they depict data which is on a nautical chart. For navigation please refer to the NOS nautical chart series."
    Type_of_Source_Media: Raster
    Source_Contribution:
    All of the nw_pacific_crm_v1 dataset was used for outlining artifacts in DEM_artfacts.shp. Only cells with an elevation equal to or less than 0 meters in the dataset datum were retained in the final topographic and bathymetry product. nw_pacific_crm_v1 data were not directly used for areas with merging or channel type artifacts nor where other elevation data were used to replace nw_pacific_crm_v1 data, outlined in DEM_artifacts.shp.
    individual NED tiles (source 13 of 14)
    United States Geological Survey, 2013, U.S. Geological Survey national elevation dataset: U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: Raster
    Source_Contribution:
    1 by 1 degree seamless sections of the National Elevation Dataset (NED) were downloaded for U.S. coastal topography included within the potential area required for groundwater models of coastal areas. Elevations greater than 8 meters in the final product are all from NED data. Elevations between 8 and 0 meters may be NED values but the source depends on the availability of bathymetry for each grid cell.
    092G.bag (source 14 of 14)
    Service, Canadian Hydrographic, 2014, 500m Bathymetry: Fisheries and Oceans Canada, Canadian Hydrographic Service.

    Online Links:

    Other_Citation_Details:
    The horizontal datum for the dataset is global Mercator (Mercator_1SP,EPSG 9804). The vertical datum is "Unknown". The cell size is 500 meters. Additional information can be found in the dataset metadata (http://geoportal.gc.ca/data/500m_Bathymetry/092G_Metadata.xml). DISCLAIMER: "This product has been produced by or for the U.S. Geological Survey and includes data provided by the Canadian Hydrographic Service of the Department of Fisheries and Oceans. The incorporation of data sourced from the Canadian Hydrographic Service of the Department of Fisheries and Oceans within this product does NOT constitute an endorsement by the Canadian Hydrographic Service or the Department of Fisheries and Oceans of this product."
    Type_of_Source_Media: Raster
    Source_Contribution:
    This dataset was used to supply values where the merged CRM and NED datasets were missing bathymetry values.
  2. How were the data generated, processed, and modified?
    Date: 2016 (process 1 of 2)
    Manually outlined and delineated features where the DEMs in this analysis required additional steps to correct artifacts using ArcGIS 10.3. The elevations were checked primarily by using a color scheme that ranged from slightly below sea level to slightly above sea level to accentuate the elevations in the coastal zones. For the U.S. east coast, the range used was primarily -10 m to 10 m relative to zero in the datum of the source data. For the U.S. west coast, -20 m to 20 m and -10 m to 50 m were used to check both coastal zones and as well as deeply incised channels. Person who carried out this activity:
    Kevin M. Befus
    University of Wyoming
    University of Wyoming
    Laramie, WY
    USA

    307-766-2390 (voice)
    kbefus@uwyo.edu
    Contact_Instructions:
    Kevin is currently with the University of Wyoming as an Assistant Professor in the Civil and Architectural Engineering Department. His contact information has been updated to reflect this.
    Data sources produced in this process:
    • DEM_artifacts.shp
    Date: 07-Aug-2020 (process 2 of 2)
    Added keywords section with USGS persistent identifier as theme keyword. 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?

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

  1. How well have the observations been checked?
    Features were manually drawn. Many of the artifacts were lines (i.e., infinitely thin) that were delineated by polygonal features with a finite width. The drawn width does not represent an area for the artifact, but rather outlines the general location of the artifact.
  2. How accurate are the geographic locations?
    The horizontal accuracy of the features were dependent upon the horizontal accuracy of the source terrain models. The feature boundary locations were manually drawn and do not represent an exact position or boundaries of an artifact, but instead were meant to indicate the presence of an artifact within the area encompassed by the polygon feature.
  3. How accurate are the heights or depths?
    The shapfile has no vertical component.
  4. Where are the gaps in the data? What is missing?
    Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    The individual and merged elevation datasets were checked for accuracy in the coastal area using coloring schemes that highlighted elevations near sea level (e.g., -10 m to 10 m). These areas were delineated manually and at multiple scales. Features contained in this dataset do not locate all elevation artifacts.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. These data are not for navigational use.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    USA

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? DEM_artifacts.zip: ZIP file contains the shapefile and associated components for DEM_artifacts.shp, a browse thumbnail, and the associated FGDC metadata.
  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?

Who wrote the metadata?

Dates:
Last modified: 16-Nov-2021
Metadata author:
Kevin M. Befus
University of Wyoming
University of Wyoming
Laramie, WY
USA

307-766-2390 (voice)
whsc_data_contact@usgs.gov
Contact_Instructions:
Kevin is currently with the University of Wyoming as an Assistant Professor in the Civil and Architectural Engineering Department. His contact information has been updated to reflect this. The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS or the email is otherwise invalid.
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_F7W37TGK/DEM_artifacts.shp.faq.html>
Generated by mp version 2.9.50 on Tue Nov 16 10:06:28 2021