Gibbs, Ann E.
Ohman, Karin A.
Coppersmith, Ryan
Richmond, Bruce M.
2017
Digital Shoreline Analysis System (DSAS) version 4.3 Transects with Short-Term Linear Regression Rate Calculations for the Exposed Central Beaufort Sea coast of Alaska between the Hulahula River and the Colville River
vector digital data (polyline)
data release
10.5066/F72Z13N1
U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.5066/F72Z13N1
https://www.sciencebase.gov/catalog/file/get/5949c4c7e4b062508e359c08
Gibbs, Ann E.
Ohman, Karin A.
Coppersmith, Ryan
Richmond, Bruce M.
2017
National Assessment of Shoreline Change: 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
data release
10.5066/F72Z13N1
Reston, VA
U.S. Geological Survey
https://doi.org/10.5066/F72Z13N1
This dataset consists of short-term (~31 years) shoreline change rates for the north coast of Alaska between the Hulahula River and the Colville River. Rate calculations were computed within a GIS using the Digital Shoreline Analysis System (DSAS) version 4.3, an ArcGIS extension developed by the U.S. Geological Survey. Short-term rates of shoreline change were calculated using a linear regression rate-of-change method based on available shoreline data between 1979 and 2010. A reference baseline was used as the originating point for the orthogonal transects cast by the DSAS software. The transects intersect each shoreline establishing measurement points, which are then used to calculate short-term rates.
The Arctic Coastal Plain of northern Alaska is an area of strategic economic importance to the United States, is home to remote Native American communities, and encompasses unique habitats of global significance. Coastal erosion along the north coast of Alaska is chronic, widespread, may be accelerating, and is threatening defense and energy-related infrastructure, natural shoreline habitats, and Native Alaskan communities. There is an increased demand for accurate information regarding past and present shoreline changes across the United States. To meet these national needs, the Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) is compiling existing reliable historical shoreline data along sandy shores of the conterminous United States and parts of Alaska and Hawaii under the National Assessment of Shoreline Change project.
There is no widely accepted standard for analyzing shoreline change. Existing shoreline data measurements and rate calculation methods vary from study to study and prevent combining results into state-wide or regional assessments. The impetus behind the National Assessment project was to develop a standardized method of measuring changes in shoreline position that is consistent from coast to coast. The goal was to facilitate the process of periodically and systematically updating the results in an internally consistent manner.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
1979
2010
ground condition
None planned
-150.210539562
-144.291315247
70.5659879023
69.9538205247
North coast of Alaska between the Hulahula River and the Colville River
USGS Metadata Identifier
USGS:5949c4c7e4b062508e359c08
None
Shoreline
Shoreline Change
Digital Shoreline Analysis System
DSAS
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Pacific Coastal and Marine Science Center
PCMSC
National Assessment of Shoreline Change Project
National Assessment of Coastal Change Hazards
ISO 19115 Topic Category
oceans
environment
geoscientificInformation
USGS Thesaurus
coastal processes
Data Categories for Marine Planning
Habitat
Marine Realms Information Bank (MRIB) keywords
shoreline accretion
shoreline erosion
Geographic Names Information System (GNIS)
North Slope
Beaufort Sea
Staines River
Sagavanirktok River
Colville River
Kuparuk River
Harrison Bay
Prudhoe Bay
Arctic National Wildlife Refuge
Canning River
State of Alaska
United States of America
None
Arctic
ANWR
None
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.
Ann E. Gibbs
U.S. Geological Survey, Pacific Coastal and Marine Science Center
mailing and physical address
2885 Mission Street
Santa Cruz
CA
95060-5792
USA
831-460-7540
831-427-4748
agibbs@usgs.gov
CentralBeaufortExtent.jpg
Map of the Central Beaufort subregion of the north coast of Alaska shoreline change assessment area.
JPEG
U.S. Geological Survey
Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1 (Build 4959) Service Pack N/A (Build N/A)
Gibbs, A.E.
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
Open-File Report
2017-1107
Reston, VA
U.S. Geological Survey
https://doi.org/10.3133/ofr20171107
Ann E. Gibbs
Bruce M. Richmond
2015
National Assessment of Shoreline Change: Historical Shoreline Change along the North Coast of Alaska, U.S.--Canadian Border to Icy Cape
Open-File Report
2015-1048
Reston, VA
U.S. Geological Survey
https://dx.doi.org/10.3133/ofr20151048
E.R. Thieler
E.A. Himmelstoss
J.L. Zichichi
A. Ergul
2009
Digital Shoreline Analysis System (DSAS) version 4.0 - An ArcGIS extension for calculating shoreline change
Open-File Report
2008-1278
Reston, VA
U.S. Geological Survey
Current version at time of use was 4.3
https://woodshole.er.usgs.gov/project-pages/DSAS/version4/index.html
https://woodshole.er.usgs.gov/project-pages/DSAS/
The attributes of this dataset are based on the field requirements of the Digital Shoreline Analysis System and were automatically generated by the software during the generation of the transect layer or during the calculation of shoreline change rates performed by the software.
These data were generated using DSAS v4.3, an automated software program which does not perform checks for fidelity of the input features. The transects were visually inspected and sometimes manually adjusted within a standard ArcMap edit session to adjust the position at which an individual transect intersected the shorelines.
This dataset contains the transects automatically generated by the DSAS software application that were used to calculate shoreline change rates along sections of the north coast of Alaska, between the U.S.-Canadian border and Icy Cape, where shoreline position data were available. Additional transects may have been generated but did not intersect the shoreline dates specified.
A formal accuracy assessment of the horizontal positional information in the data set has not been conducted.
A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable.
U.S. Geological Survey
2017
Offshore baseline for the exposed Central Beaufort Sea, Alaska coastal region (Hulahula River to the Colville River) generated to calculate shoreline change rates
shapefile
online
U.S. Geological Survey
https://www.sciencebase.gov/catalog/file/get/594314f5e4b062508e309c33
Digital Resources
Unknown
ground condition
DSAS baseline
DSAS baseline used for calculation of shoreline change rates.
U.S. Geological Survey
2017
Shorelines of the Central Beaufort Sea, Alaska coastal region (Hulahula River to the Colville River) used in shoreline change analysis
shapefile
online
U.S. Geological Survey
https://www.sciencebase.gov/catalog/file/get/594837a3e4b062508e344435
Digital Resources
1979
2012
ground condition
DSAS shoreline
DSAS shoreline file used for calculation of shoreline change rates.
Transect Features Generated using DSAS v4.3 in ArcMap v10.3. Parameters Used: baseline layer=UTMX_Baseline, transect spacing=50 meters, transect length=500m, cast direction=onshore, baseline location=offshore, cast method=smoothed, smoothing distance=50 meters. For additional details on these parameters, please see the DSAS help file distributed with the DSAS software.
2016
Some transects did not intersect all shorelines at the default transect length. These transects were manually lengthened in an edit session using standard editing tools in ArcMap v10.3. Some transects intersected the shorelines at an oblique angle. These transects were manually adjusted to a more shore-normal position in an edit session using standard editing tools in ArcMap v10.3.
2016
Rate calculations performed using DSAS v4.3 in ArcMap v10.3 on selected shoreline features. Parameters Used: shoreline layer= CentralBeaufort_shorelines, shoreline date field=DATE_, shoreline uncertainty field name=Uncy, the default accuracy= 0 meters, shoreline intersection parameters=nearest, stats calculations=[Linear Regression Rate (LRR)], shoreline threshold=4, confidence interval=90%,
2016
Shoreline change rates table was joined to the transect feature class in ArcMap v10.3 by right-clicking on the transect layer > joins and relates > join > join attributes from a table. Parameters: join field - ObjectID; field in table: TransectID; join options - keep only matching records.
2016
The joined transect feature class was exported to a shapefile in ArcMap v10.3 by right-clicking the transect layer > data > export data, permanently linking the joined rate fields to the transect attribute table.
2016
The exported transect shapefile was projected in Esri's ArcToolbox (v10.3) > Data Management Tools > Projections and Transformations > Feature > Project. Parameters: input projection - UTM zone XN (NAD83; where X is the corresponding UTM Zone); output projection - geographic coordinates (WGS84); transformation = WGS_1984_(ITRF00)_To_NAD_1983.
2016
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
20201019
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Vector
String
2637
0.0196106767
0.0558024800
Decimal seconds
D_WGS_1984
WGS_1984
6378137.0
298.257223563
Attribute Table
Table containing attribute information associated with the data set.
Producer defined
OBJECTID
Internal feature number generated for each row of the transect attribute table when stored as a feature class in a geodatabase. This value is the common attribute field when joining to the TransectID value in short-term results output table calculated by DSAS.
U.S. Geological Survey
34
4161
BaselineID
Unique identification number of the baseline segment. Used by DSAS to determine transect ordering alongshore if multiple baseline segments exist.
U.S. Geological Survey
2
32
Group_
Region ID as defined in Gibbs and Richmond (2017).
U.S. Geological Survey
2
Hulahula River to the Staines River region
Producer defined
3
Staines River to the Sagavanirktok River region
Producer defined
4
Sagavanirktok River to the Colville River region
Producer defined
TransOrder
Assigned by DSAS based on ordering of transects along the baseline. Used to allow user to sort transect data along the baseline from baseline start to baseline end.
U.S. Geological Survey
79
4163
ProcTime
Date and time (YYYY/MM/DD HH:MM:SS) a transect was processed. This value is automatically assigned by the DSAS extension.
U.S. Geological Survey
2012/05/02 12:28:16
2015/11/18 15:30:12
Autogen
Assigned by DSAS to indicate whether or not a transect was automatically created by DSAS (1= transect was auto generated by DSAS; 0=transect was not auto-generated).
U.S. Geological Survey
0
Transect was not auto-generated by DSAS
Producer defined
1
Transect was auto-generated by DSAS
Producer defined
StartX
Unknown
Producer defined
380778.48
603110.5
StartY
Unknown
Producer defined
7762579.07
7831525.65
EndX
Unknown
Producer defined
380922.38
603180.21
EndY
Unknown
Producer defined
7762029.59
7830976.59
Azimuth
Unknown
Producer defined
0.75
358.53
ShoreType
User defined shoreline type
U.S. Geological Survey
Exposed Barrier Island
Offshore deposits of sand or sediment that run parallel to the coastline.
Producer defined
Exposed Barrier Spit
Sand or gravel deposit extending from the mainland into a body of water.
Producer defined
Exposed Island
Portions of offshore islands exposed to direct wave energy.
Producer defined
Exposed Mainland
A large, continuous extent of land that does not include offshore islands or other detached territories.
Producer defined
Shape_Leng
Length of the transect created by DSAS
Producer defined
213.284502477
1005.01336909
TransectId
Same value as ObjectID. Used as a permanent and unique identification number for each transect in the output rates table calculated by DSAS. This attribute was used as the common field when joining the rates table (.dbf) to the transect feature class in a geodatabase.
U.S. Geological Survey
34
4161
TCD
Total cumulative distance in meters from start of baseline to transect location.
U.S. Geological Survey
5095.52
314983.32
LRR
A linear regression rate-of-change statistic was calculated by fitting a least-squares regression line to all shoreline points for a particular transect. The best-fit regression line is placed so that the sum of the squared residuals (determined by squaring the offset distance of each data point from the regression line and adding the squared residuals together) is minimized. The linear regression rate is the slope of the line. The rate is reported in meters per year with positive values indicating accretion and negative values indicating erosion.
U.S. Geological Survey
-18.74
20.55
LR2
The R-squared statistic, or coefficient of determination, is the percentage of variance in the data that is explained by a regression. It is a dimensionless index that ranges from 1.0 to 0.0 and measures how successfully the best-fit line accounts for variation in the data. The smaller the variability of the residual values around the regression line relative to the overall variability, the better the prediction (and closer the R-squared value is to 1.0).
U.S. Geological Survey
0
1
LSE
The predicted (or estimated) values of y (the distance from baseline in meters) are computed for each shoreline point by using the values of x (the shoreline date) and solving the equation for the best-fit regression line (y=mx+b). The standard error is also called the standard deviation.
U.S. Geological Survey
0
231.15
LCI90
The standard error of the slope with confidence interval describes the uncertainty of the reported rate. The LRR rates are determined by a best-fit regression line for the shoreline data at each transect. The slope of this line is the reported rate of change (in meters/year). The confidence interval (LCI) is calculated by multiplying the standard error (also called the standard deviation) of the slope by the two-tailed test statistic at the user-specified 90 percent confidence. This value is often reported in conjunction with the slope to describe the confidence of the reported rate. For example: LRR = 1.2 LCI90 = 0.7 could be reported as a rate of 1.2 (+/-) 0.7 meters/year.
U.S. Geological Survey
0
72.104
CalcEra
Decade (era) of shorelines used to calculate shoreline change rates.
U.S. Geological Survey
1980s, 2000s, 2010s
Unknown
Producer defined
All calculations for length are in meter units and were based on the coincident UTM zone WGS84
Unknown
U.S. Geological Survey - Science Base
mailing and physical address
CenterDenver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
CA
888-275-8747
sciencebase@usgs.gov
CentralBeaufort_exposed_STlrr_rates.shp
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.
Vector Digital Data Set (Polyline)
9.0
Esri polyline shapefile
This WinZip file contains the baseline shapefile for use generating transects within the Digital Shoreline Analysis System for the Central Beaufort Sea coast of Alaska and associated metadata.
Use WinZip or pkUnzip
240
https://www.sciencebase.gov/catalog/file/get/5949c4c7e4b062508e359c08
https://doi.org/10.5066/F72Z13N1
Data are downloadable via the World Wide Web (WWW).
None
This zip file contains data available in Environmental Systems Research Institute (Esri) polyline 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.
20201019
Ann E. Gibbs
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Geologist
mailing and physical address
2885 Mission Street
Santa Cruz
CA
95060-5792
USA
831-460-7540
831-427-4748
agibbs@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
local time