Polygon shapefiles attributed with morphometric information for barrier islands and spits located along the north coast of Alaska between Cape Beaufort and the U.S.-Canadian border, 1947 to 2019

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Hamilton, Anna I., Gibbs, Ann E., Erikson, Li H., and Engelstad, Anita C., 20210812, Polygon shapefiles attributed with morphometric information for barrier islands and spits located along the north coast of Alaska between Cape Beaufort and the U.S.-Canadian border, 1947 to 2019: data release DOI:10.5066/P90EQ1H7, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://www.sciencebase.gov/catalog/item/5f8f1b8582ce06b040efc901
   • https://doi.org/10.5066/P90EQ1H7

   This is part of the following larger work.
   Hamilton, Anna I., Gibbs, Ann E., Erikson, Li H., and Engelstad, Anita C., 20201231, Historical shorelines and morphological metrics for barrier islands and spits along the north coast of Alaska between Cape Beaufort and the U.S.-Canadian border, 1947 to 2019: data release DOI:10.5066/P90EQ1H7, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/P90EQ1H7

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -164.08213763
   East_Bounding_Coordinate: -140.489705466
   North_Bounding_Coordinate: 71.377552267
   South_Bounding_Coordinate: 69.080580846
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 01-Jul-1947

   Ending_Date: 20-Jun-2019

   Currentness_Reference:

   dates of source data used

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (747)
   2. What coordinate system is used to represent geographic features?
      The map projection used is NAD 1983 2011 Alaska Albers (ESRI Full Name: NAD_1983_2011_Alaska_Albers).
      

      Projection parameters:

      Standard_Parallel: 55.0
      Standard_Parallel: 65.0
      Longitude_of_Central_Meridian: -154.0
      Latitude_of_Projection_Origin: 50.0
      False_Easting: 0.0
      False_Northing: 0.0
      

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in Meter
      The horizontal datum used is D_NAD_1983_2011.
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      
7. How does the data set describe geographic features?

   Attribute Table

   Table containing attribute information associated with the data set. (Source: Producer defined)

   Barrier_ID

   Identification number of a single barrier island - randomly assigned (Source: Producer defined)

   Range of values
   Minimum:	1
   Maximum:	189

   BIChain_ID

   Barrier chain identification number (Source: Producer defined)

   Range of values
   Minimum:	1
   Maximum:	42

   Era

   Analysis era (Source: Producer defined)

   Value	Definition
   1950s	Shoreline year 1947 or 1949
   1980s	Shoreline year 1978 to 1987
   2000s	Shoreline year 1997 to 2007
   2010s	Shoreline year 2009 to 2016
   2020s	Shoreline year 2016 to 2019

   P_Year

   Predominant shoreline year, if more than one, used for classification of barrier polygon (Source: Producer defined)

   Range of values
   Minimum:	1947
   Maximum:	2019
   Units:	year
   Resolution:	1

   T_Years

   All shoreline years composing a barrier shoreline. Some polygons consist of shorelines from more than one year. (Source: Producer defined)

   Range of values
   Minimum:	1947
   Maximum:	2019
   Units:	year
   Resolution:	1

   Shoretype

   Type of barrier feature (Source: Producer defined)

   Value	Definition
   Barrier beach	Sand or gravel deposit extending across a body of water
   Barrier island	Offshore deposits of sand or sediment that run parallel to the coastline
   Barrier spit	Sand or gravel deposit extending from the mainland into a body of water

   Type

   Type of barrier (Source: Producer defined)

   Value	Definition
   Constructed	Constructed barrier, no tundra vegetation present
   N	Unable to determine barrier type
   Remnant	Relict tundra vegetation present

   Tundra

   Tundra vegetation present or absent as determined from the 1980s-era imagery (Source: Producer defined)

   Value	Definition
   {Null Value / Empty Field Entry}	Tundra presence or absence was not determined for features of this Era
   A	Tundra vegetation in 1980s era imagery is absent
   P	Tundra vegetation in 1980s era imagery is present

   Veg_area

   Approximate percentage of total area covered by tundra vegetation, when present, as determined from 1980s-era imagery (Source: Producer defined)

   Value	Definition
   {Null Value / Empty Field Entry}	Tundra vegetation percent was not determined for for features of this Era
   0%	0 percent tundra vegetation present
   <25%	Less than 25 percent tundra vegetation present
   25% to 50%	25 to 50 percent tundra vegetation present
   50% to 75%	50 to 75 percent tundra vegetation present
   >75%	Greater than 75 percent tundra vegetation present

   Total_Isla

   Total number of islands in a barrier chain during the specified analysis era (Source: Producer defined)

   Range of values
   Minimum:	1
   Maximum:	21

   Recurv

   Presence, absence, and location of recurved features on the barrier (Source: Producer defined)

   Value	Definition
   0	No recurved feature
   1	Recurved feature on the east end of the barrier
   2	Recurved feature on the west end of the barrier
   3	Recurved feature on the north end of the barrier

   REast_term

   Total number of active termini on eastern end of barrier (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	9

   RWest_term

   Total number of active termini on western end of barrier (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	5

   Total_tran

   Total number of transects used in orientation data for each barrier (Source: Producer defined)

   Range of values
   Minimum:	26
   Maximum:	1517

   Area

   Area of barrier in square meters (Source: Producer defined)

   Range of values
   Minimum:	17.899
   Maximum:	9818190.555
   Units:	Square meters
   Resolution:	0.01

   Area_leng

   Area (square meters) per length (meters) of shorelines in barrier chain (Source: Producer defined)

   Range of values
   Minimum:	33.11
   Maximum:	412.57
   Units:	meters
   Resolution:	0.01

   Chain_Area

   Total area of all exposed barriers in a single barrier chain, in square meters (Source: Producer defined)

   Range of values
   Minimum:	8991.90
   Maximum:	13645176.60
   Units:	square meters
   Resolution:	0.01

   Chain_leng

   Total exposed barrier shoreline length within a single barrier chain, in meters (Source: Producer defined)

   Range of values
   Minimum:	1689.06
   Maximum:	52703.58
   Units:	meters
   Resolution:	0.01

   Perimeter

   Perimeter of barrier polygon in meters (Source: Producer defined)

   Range of values
   Minimum:	16.57
   Maximum:	1051615.69
   Units:	Meters
   Resolution:	0.01

   Shore_leng

   Length of exposed shoreline in meters; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	33.04
   Maximum:	32687.08
   Units:	meters
   Resolution:	0.01

   Cross_leng

   Cross shore/straight line length of shoreline in meters; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	28.09
   Maximum:	31441.42
   Units:	meters
   Resolution:	0.01

   Sinuosity

   Ratio between exposed shore length (shore_leng) and cross shore length (cross_leng), in meters; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	0.03
   Maximum:	2.73
   Units:	meters
   Resolution:	0.01

   Min_width

   Minimum width of barrier based on transects spaced at 50-meter intervals; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	0.12
   Maximum:	918.29
   Units:	meters
   Resolution:	0.01

   Max_width

   Maximum width of barrier based on transects spaced at 50-meter intervals; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	3.08
   Maximum:	1127.50
   Units:	meters
   Resolution:	0.01

   Avg_width

   Mean width of barrier based on transects spaced at 50-meter intervals; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	3.08
   Maximum:	927.34
   Units:	meters
   Resolution:	0.01

   P25_width

   25th percentile width of barrier based on transects spaced at 50-meter intervals; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	2.19
   Maximum:	920.83
   Units:	meters
   Resolution:	0.01

   P75_width

   75th percentile width of barrier based on transects spaced at 50-meter intervals; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	3.08
   Maximum:	933.58
   Units:	meters
   Resolution:	0.01

   Min_orient

   Minimum orientation angle of barriers in a chain (Source: Producer defined)

   Range of values
   Minimum:	90.00
   Maximum:	215.64
   Units:	cardinal degrees
   Resolution:	0.01

   Max_orient

   Maximum orientation angle of barriers in a chain (Source: Producer defined)

   Range of values
   Minimum:	119.05
   Maximum:	270.00
   Units:	cardinal degrees
   Resolution:	0.01

   Med_orient

   Median orientation angle of barriers in a chain (Source: Producer defined)

   Range of values
   Minimum:	104.80
   Maximum:	250.41
   Units:	cardinal degrees
   Resolution:	0.01

   Ave_orient

   Mean or average orientation angle of barriers in a chain (Source: Producer defined)

   Range of values
   Minimum:	105.53
   Maximum:	244.71
   Units:	cardinal degrees
   Resolution:	0.01

   Skw_orient

   Skewness of orientation angle of barrier chain (Source: Producer defined)

   Range of values
   Minimum:	-6.25
   Maximum:	10.32
   Units:	cardinal degrees
   Resolution:	0.01

   P25_orient

   25th percentile of barrier chain orientation (Source: Producer defined)

   Range of values
   Minimum:	96.05
   Maximum:	244.30
   Units:	cardinal degrees
   Resolution:	0.01

   P75_orient

   25th percentile of barrier chain orientation (Source: Producer defined)

   Range of values
   Minimum:	108.21
   Maximum:	264.28
   Units:	cardinal degrees
   Resolution:	0.01

   Min_elev

   Minimum 2010s-era barrier elevation; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	-1.00
   Maximum:	0.13
   Units:	meters relative to the experimental geoid xGEOID17b
   Resolution:	0.01

   Max_elev

   Maximum 2010s-era barrier elevation; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	0.13
   Maximum:	8.20
   Units:	meters relative to the experimental geoid xGEOID17b
   Resolution:	0.01

   Avg_elev

   Average 2010s-era barrier elevation; -9999 indicates the metric was not calculated (NoData) (Source: Producer defined)

   Range of values
   Minimum:	-0.26
   Maximum:	3.99
   Units:	meters relative to the experimental geoid xGEOID17b

   Entity_and_Attribute_Overview:

   The entity and attribute information provided here describes the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set.

   Entity_and_Attribute_Detail_Citation:

   The entity and attribute information were generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Anna I. Hamilton
   • Ann E. Gibbs
   • Li H. Erikson
   • Anita C. Engelstad
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   Attn: PCMSC Science Data Coordinator

   2885 Mission Street

   Santa Cruz, CA
   

   USA

   831-427-4747 (voice)

   pcmsc_data@usgs.gov

Why was the data set created?

These data accompany Hamilton and others (2021), a U.S. Geological Survey Open-File Report summarizing historical morphological change to barrier islands and spits located along the north-slope coast of Alaska between Cape Beaufort and the U.S.-Canadian border. The purpose of the study is to improve upon the understanding of barrier formation, evolution, and stability in a permafrost setting. The results can be used to advance an understanding of barrier island dynamics and better predict future barrier evolution and prevalence along Alaska’s coast.

How was the data set created?

1. From what previous works were the data drawn?

   Hamilton and others (2021) (source 1 of 5)

   Hamilton, Anna I., Gibbs, Ann E., Erikson, Li H., and Engelstad, Anita C., 2021, Historical shoreline vectors for barrier islands and spits along the north coast of Alaska between Cape Beaufort and the U.S.-Canadian border, 1947 to 2019: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/P90EQ1H7

   Type_of_Source_Media: Digital and/or Hardcopy Resources
   Source_Contribution:

   Source information used in support of the development of the data set.

   Gibbs and others (2017) (source 2 of 5)

   Gibbs, Ann E., Ohman, Karin A., Coppersmith, Ryan, and Richmond, Bruce M., 20170918, A GIS compilation of updated vector shorelines and associated shoreline change data for the north coast of Alaska, U.S. Canadian Border to Icy Cape: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/F72Z13N1

   Type_of_Source_Media: Digital and/or Hardcopy Resources
   Source_Contribution:

   Source information used in support of the development of the data set.

   Snyder and Gibbs, 2019 (source 3 of 5)

   Snyder, Alexander G., and Gibbs, Ann E., 20191227, National Assessment of Shoreline Change: A GIS compilation of vector shorelines and associated shoreline change data for the north coast of Alaska, Icy Cape to Cape Prince of Wales: U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/P9H1S1PV

   Type_of_Source_Media: Digital and/or Hardcopy Resources
   Source_Contribution:

   Source information used in support of the development of the data set.

   2010s barrier elevation dataset (source 4 of 5)

   U.S. Geological Survey, 2015, 2009 USGS Lidar: North Slope, Alaska: NOAA Digital Coast, online.

   Online Links:

   • https://coast.noaa.gov/digitalcoast/data/

   Type_of_Source_Media: Digital Resources
   Source_Contribution: Data were used as the source of barrier elevation.
   

   AHAP photomosaics (source 5 of 5)

   U.S. Fish and Wildlife Service, Arctic Landscape Conservation Cooperative, and University of Alaska, Fairbanks Alaska Satellite Facility and the Geographic Information Network of Alaska, 2012, Orthorectified 1:64,000-scale color-infrared Alaska High-Altitude Aerial Photography: Unpublished data, Unpublished data.

   Type_of_Source_Media: Digital Data (.tif)
   Source_Contribution:

   Alaska high altitude aerial photography was used to delineate the presence or absence of tundra vegetation.

2. How were the data generated, processed, and modified?

   Date: 2020 (process 1 of 1)

   Vector shapefiles of barrier shorelines from Hamilton and others (2020b) were converted to polygons using the Feature to Polygon tool in ArcGIS 10.7. Barrier polygons and polyline shorelines were used to calculate the following morphometrics of each barrier in each study era: number of islands (in each barrier chain), type (constructed or relict), area, perimeter length, exposed-shoreline length (length of the shoreline on the exposed coast), straight-line length (length between the western- and eastern-most points of the exposed shoreline), sinuosity (the ratio between exposed-shoreline length and straight-line length), width (mean, maximum, minimum, 25th and 75th percentiles), presence or absence of recurved features on either end of the island, presence and number of relict terminus features on either end of the island, presence of tundra vegetation, approximate vegetation cover (for 1980s-era only) and barrier chain orientation (maximum, minimum, mean, median, 25th and 75th percentiles). Elevation metrics, including mean, maximum, minimum, median elevations were extracted for all 2010s-era barrier polygons from 1-m resolution digital surface models derived from the 2010s barrier elevation dataset using the Zonal Statistics as Table tool in ArcMap. The number of barriers in each island chain, barrier area, and perimeter length were calculated from the polygon shapefiles in ArcMap 10.7. Exposed-shoreline and straight-line lengths were then calculated from vector shapefiles. Widths were calculated using transects created with the Digital Shoreline Analysis System (DSAS) v.5 tool (Himmelstoss and others, 2018). Transects were cast with 50-m spacing using existing baselines from Gibbs and others (2017) and Snyder and Gibbs (2019) and then clipped to the barrier perimeter boundary. Width statistics were calculated for each barrier chain and each individual barrier using MATLAB. Barrier chain orientation statistics were also calculated in MATLAB using the X and Y points of transect intersections along the exposed shoreline. Presence of recurved features on either end, as well as the number of relict termini, was visually identified. The presence or absence of tundra vegetation and the approximate percent coverage on individual barriers was determined visually from the 1980s-era, color-infrared AHAP photomosaics, because it was the only data set with a mostly complete and temporally consistent image data set for the study area. Tundra vegetation coverage was interpreted as quartile percentages (0 percent, less than 25 percent, 25-50 percent, 50-75 percent, and greater than 75 percent). For additional information about the data please see Hamilton and others (2020a).

3. What similar or related data should the user be aware of?
   Gibbs, Ann E., and Richmond, Bruce M., 2015, National assessment of shoreline change--Historical shoreline change along the north coast of Alaska, U.S.-Canadian border to Icy Cape.

   Online Links:

   • https://doi.org/10.3133/ofr20151048

   Other_Citation_Details:

   Gibbs, A.E., and Richmond, B.M., 2015, National assessment of shoreline change--Historical shoreline change along the north coast of Alaska, U.S.-Canadian border to Icy Cape: U.S. Geological Survey Open-File Report 2015-1048, 96 p.

   Gibbs, Ann E., and Richmond, Bruce M., 2017, National assessment of shoreline change--Summary statistics for updated vector shorelines and associated shoreline change data for the north coast of Alaska, U.S.-Canadian border to Icy Cape.

   Online Links:

   • https://doi.org/10.3133/ofr20171107

   Other_Citation_Details:

   Gibbs, A.E., and Richmond, B.M., 2017, National assessment of shoreline change--Summary statistics for updated vector shorelines and associated shoreline change data for the north coast of Alaska, U.S.-Canadian border to Icy Cape: U.S. Geological Survey Open-File Report 2017--1107, 21 p.

   Himmelstoss, Emily A., Henderson, Rachel E., Kratzmann, Meridith G., and Farris, Amy S., 2018, Digital Shoreline Analysis System (DSAS) version 5.0 user guide.

   Online Links:

   • https://doi.org/10.3133/ofr20181179

   Other_Citation_Details:

   Himmelstoss, E.A., Henderson, R.E., Kratzmann, M.G., and Farris, A.S., 2018, Digital Shoreline Analysis System (DSAS) version 5.0 user guide: U.S. Geological Survey Open-File Report 2018–1179, 110 p.

   Gibbs, Ann E., Snyder, Alexander G., and Richmond, Bruce M., 2019, National assessment of shoreline change--Historical shoreline change along the north coast of Alaska, Icy Cape to Cape Prince of Wales.

   Online Links:

   • https://doi.org/10.3133/ofr20191146

   Other_Citation_Details:

   Gibbs, A.E., Snyder, A.G., and Richmond, B.M., 2019, National assessment of shoreline change--Historical shoreline change along the north coast of Alaska, Icy Cape to Cape Prince of Wales: U.S. Geological Survey Open-File Report 2019-1146, 52 p.

   Hamilton, Anna I., Gibbs, Ann E., Erikson, Li H., and Engelstad, Anita C., 2021, Assessment of barrier island morphological change in northern Alaska.

   Online Links:

   • https://doi.org/10.3133/ofr2021-1074

   Other_Citation_Details:

   Hamilton, A.I., Gibbs, A.E., Erikson, L.H., and Engelstad, A.C., 2021, Assessment of barrier island morphological change in northern Alaska: U.S. Geological Survey Open-File Report 2021-1074

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

1. How well have the observations been checked?
   The attributes in this dataset record positional and measurement uncertainties calculated during the process of extracting morphological metrics from the data as described in the process steps.
2. How accurate are the geographic locations?
   A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The horizontal accuracy of shorelines compiled from 1947 to 2019 data varies with respect to the data source from which the shorelines were digitized and the time period. Please visit the 'Estimation of Shoreline Position Uncertainty' section in Gibbs and Richmond (2015), Gibbs and Richmond (2017) and Gibbs and others (2019) for a complete explanation of the measurement uncertainties associated with these shorelines.
3. How accurate are the heights or depths?
   A formal accuracy assessment of the vertical positional information in the data set has either not been conducted or is not applicable.
4. Where are the gaps in the data? What is missing?
   This file is complete and contains all polygons used to calculate morphological metrics along sections of the specified Alaska coastal region where shoreline position data were available. These data adequately represented the shoreline position at the time of the survey. Remaining gaps in these data are a consequence of nonexisting data or existing data that did not meet quality assurance standards.
5. How consistent are the relationships among the observations, including topology?
   Adjacent polygons do not overlap across time periods. Polygons were quality checked for accuracy.

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:

USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.

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
   

   1-888-275-8747 (voice)

   sciencebase@usgs.gov
2. What's the catalog number I need to order this data set? These data are available in shapefile format contained in a single zip file, which also includes CSDGM FGDC-compliant metadata.
3. What legal disclaimers am I supposed to read?

   Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Zip file contains digitized shoreline position representing the land/water interface of barrier islands and spits on the northern coast of Alaska. in format Shapefile (version ArcGIS Desktop 10.7) Esri polygon shapefile Size: 3.1
     Network links:	https://www.sciencebase.gov/catalog/file/get/5f8f1b8582ce06b040efc901 https://www.sciencebase.gov/catalog/item/5f8f1b8582ce06b040efc901 https://doi.org/10.5066/P90EQ1H7

   • Cost to order the data: None.

5. What hardware or software do I need in order to use the data set?

   This zip file contains data available in Environmental Systems Research Institute (Esri) polygon shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.esri.com.

Who wrote the metadata?

Dates:

Last modified: 12-Aug-2021

Metadata author:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Attn: PCMSC Science Data Coordinator

2885 Mission Street

Santa Cruz, CA

831-427-4747 (voice)

pcmsc_data@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)