U.S. Geological Survey
20210831
Intersects for the southern coast of Cape Cod, Massachusetts, generated to calculate shoreline change rates using the Digital Shoreline Analysis System version 5.1
1.0
vector digital data
data release
doi:10.5066/P9YGIYFX
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.5066/P9YGIYFX
https://www.sciencebase.gov/catalog/item/610a9ce0d34ef8d70568927c
Marie K. Bartlett
Rachel E. Henderson
Amy S. Farris
Emily A. Himmelstoss
2021
Massachusetts Shoreline Change Project, 2021 Update: A GIS Compilation of Shoreline Change Rates Calculated Using Digital Shoreline Analysis System Version 5.1, With Supplementary Intersects and Baselines for Massachusetts
1.0
vector digital data
data release
doi:10.5066/P9YGIYFX
Reston, VA
U.S. Geological Survey
suggested citation: Bartlett, M.K., Henderson, R. E., Farris, A.S., and Himmelstoss, E.A., 2021, Massachusetts shoreline change project, 2021 update–A GIS compilation of shoreline change rates calculated using Digital Shoreline Analysis System version 5.1, with supplementary intersects and baselines for Massachusetts: U.S. Geological Survey data release. https://doi.org/10.5066/P9YGIYFX
https://www.sciencebase.gov/catalog/item/60ff22dad34e3ccd830d62aa
https://doi.org/10.5066/P9YGIYFX
The Massachusetts Office of Coastal Zone Management launched the Shoreline Change Project in 1989 to identify erosion-prone areas of the coast and support local land-use decisions. Trends of shoreline position over long and short-term timescales provide information to landowners, managers, and potential buyers about possible future impacts to coastal resources and infrastructure. In 2001, a 1994 shoreline was added to calculate both long- and short-term shoreline change rates along ocean-facing sections of the Massachusetts coast. In 2013 two oceanfront shorelines for Massachusetts were added using 2008-2009 color aerial orthoimagery and 2007 topographic lidar datasets obtained from NOAA's Ocean Service, Coastal Services Center. In 2018, two new mean high water (MHW) shorelines for the Massachusetts coast extracted from lidar data between 2010-2014 were added to the dataset. This 2021 data release includes rates that incorporate one new shoreline from lidar data extracted in 2018 by the U.S. Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX), added to the existing database of all historical shorelines (1844-2014), for the North Shore, South Shore, Cape Cod Bay, Outer Cape, Buzzard’s Bay, South Cape, Nantucket, and Martha’s Vineyard. 2018 lidar data did not cover the Boston or Elizabeth Islands regions. Included in this data release is a proxy-datum bias reference line that accounts for the positional difference in a proxy shoreline (the high water Line shoreline) and a datum shoreline (the mean high water shoreline. This issue is explained further in Ruggiero and List (2009) and in the process steps of the metadata associated with the rates. This release includes both long-term (~150+ years) and short term (~30 years) rates. Files associated with the long-term rates have “LT” in their names, files associated with short-term rates have "ST” in their names.
This dataset consists of point data which are created by the Digital Shoreline Analysis System (DSAS) version v5.1 at the intersection of shoreline and transect locations. Rate calculations were computed within a GIS using the Digital Shoreline Analysis System (DSAS) version 5.1, an ArcGIS extension developed by the U.S. Geological Survey. Measurement transects are cast by DSAS from the baseline to intersect shoreline vectors, and the intersect data provide location and time information used to calculate rates of change. These point data contain identification information related to the DSAS transect (TransectID, TransOrder) as well as the shoreline (ShorelineID, Uncertainty) and proxy-datum bias data (if applicable).
2021
publication date
None planned
-70.654468
-69.983701
41.672702
41.517954
ISO 19115 Topic Category
oceans
environment
geoscientificInformation
None
Intersects
Shoreline
Shoreline Change
Digital Shoreline Analysis System
DSAS
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Coastal and Marine Science Center
WHCMSC
USGS Thesaurus
geospatial datasets
coastal processes
USGS Metadata Identifier
USGS:610a9ce0d34ef8d70568927c
None
Atlantic Coast
United States
North America
Massachusetts
Cape Cod
South Cape
None.
These data were automatically generated using the DSAS v5.1 software application. 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 to be used for navigation.
U.S. Geological Survey
Marie K. Bartlett
mailing and physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
508-548-8700 x 2306
508-457-2310
mbartlett@usgs.gov
https://www.sciencebase.gov/catalog/file/get/610a9ce0d34ef8d70568927c?name=SouthCape_intersects_browse.PNG
Map view of data
png
Microsoft Windows 10 Version 6.2 (Build 1909) Esri ArcGIS 10.7.1.11595
Emily A. Himmelstoss
Amy S. Farris
Rachel E. Henderson
Meredith G. Kratzmann
Ayhan Ergul
Ouya Zhang
Jessica L. Zichichi
2018
Digital Shoreline Analysis System (version 5.0): U.S. Geological Survey Software
1
publication
software release
version 5.0
Reston, VA
U.S. Geological Survey
https://code.usgs.gov/cch/dsas/
https://doi.org/10.5066/P9VW42I0
https://woodshole.er.usgs.gov/project-pages/DSAS/
Emily A. Himmelstoss
Rachel E. Henderson
Meredith G. Kratzmann
Amy S. Farris
2018
DSAS v5.0 user guide
publication
Open-File Report
2018-1179
Reston, VA
U.S. Geological Survey
Suggested citation: Himmelstoss, E.A., Henderson, R.E., Kratzmann, M, Farris, A., 2018, DSAS version 5.0 user guide. U.S. Geological Survey report 2018-1179, https://doi.org/10.3133/ofr20181179
https://doi.org/10.3133/ofr20181179
https://www.usgs.gov/centers/whcmsc/science/digital-shoreline-analysis-system-dsas
Emily A. Himmelstoss
Amy S. Farris
Kathryn M. Weber
2018
Massachusetts Shoreline Change Project: A GIS Compilation of Vector Shorelines for the 2018 update
DOI:10.5066/P9O7S72B
data release
DOI:10.5066/P9O7S72B
Reston, VA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.5066/P9O7S72B
https://www.sciencebase.gov/catalog/item/5bcde5dce4b0f0758fc178d0
https://www.sciencebase.gov/catalog/file/get/5bcde5dce4b0f0758fc178d0
Peter Ruggiero
Jeffrey H. List
200909
Improving Accuracy and Statistical Reliability of Shoreline Position and Change Rate Estimates
publication
Journal of Coastal Research
vol. 255
n/a
Coastal Education and Research Foundation
ppg. 1069-1081
https://doi.org/10.2112/08-1051.1
Emily A. Himmelstoss
Amy S. Farris
Kathryn M. Weber
2019
Massachusetts Shoreline Change Project, 2018 Update: A GIS Compilation of Shoreline Change Rates Calculated Using Digital Shoreline Analysis System Version 5.0, With Supplementary Intersects and Baselines for Massachusetts
1
publication
Data release
DOI:10.5066/P9RRBEYK
Reston, VA
U.S. Geological Survey
https://doi.org/10.5066/P9RRBEYK
https://www.sciencebase.gov/catalog/item/5be5857ce4b0b3fc5cf8c6ca
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 intersects layer.
These data were generated using DSAS, an automated software program, which does not perform checks for fidelity of the input features. Following generation of the rates and intersects by the DSAS software a visual inspection of the intersects was performed in map view to determine that no unwanted measurements were included in the desired (long- or short-term) shoreline change analysis.
This dataset contains all the shoreline/transect intersects used to compute rates in the DSAS v5.1 software application.
The intersection points represent the location where transects cast by the Digital Shoreline Analysis System (DSAS) software crosses a historical shoreline position. They can be used to visually display which shorelines were used in the rate calculations and capture details on the shoreline represented by the intersection. The distances between the reference baseline and each shoreline intersection along a transect are used by the DSAS software to compute the shoreline change metrics. The positional uncertainties associated with the shoreline and intersection points are captured in the shoreline attribute table.
Marie K. Bartlett
Amy S. Farris
Kathryn M. Weber
Emily A. Himmelstoss
2021
Massachusetts Shoreline Change Project: A GIS Compilation of Vector Shorelines (1844-2018)
1
vector digital data
data release
doi:10.5066/P9O8QA8N
Reston, VA
U.S. Geological Survey
Suggested citation: Bartlett, M.K., Farris, A.S., and Weber, K.M., Himmelstoss, E.A., 2021, Massachusetts shoreline change project—A GIS compilation of vector shorelines (1844-2018): U.S. Geological Survey data release
https://doi.org/10.5066/P9O8QA8N
vector digital data
1844
2018
ground condition
MA 1844 - 2018 Shorelines
Shorelines published as part of the Massachusetts Shoreline Change Project, 2021 Update were compiled for shoreline change analysis with DSAS v5.1
Marie K. Bartlett
Rachel E. Henderson
Amy S. Farris
Emily A. Himmelstoss
2021
Baseline for the southern coast of Cape Cod, Massachusetts, generated to calculate shoreline change rates using the Digital Shoreline Analysis System version 5.1
1
vector digital data
data release product
doi:10.5066/P9YGIYFX
Reston, VA
U.S. Geological Survey
https://doi.org/10.5066/P9YGIYFX
vector digital data
2021
ground condition
SouthCape_baseline
Baseline files for region published as part of the Massachusetts Shoreline Change Project, 2021 Update used for shoreline change analysis with DSAS v5.1
Explanation of the methods used to calculate shoreline change rates as part of the 2021 update for the Massachusetts Office of Coastal Zone Management Shoreline Change Project: This data release consists of intersect point shapefiles that hold the data necessary to calculate long- and short-term rates of shoreline change. Depending on the available data, the shorelines used for analysis may include those referenced to mean high water (MHW) or a proxy-based high water line (HWL).Transects with both MHW and HWL shorelines will have the proxy-datum bias applied. Shoreline data from the 2021 data release (historical and 2018), were merged into a single feature class (MA_shorelines_LT) for the long-term shoreline change. For this completed shoreline compilation, shoreline data were extracted for the last 30 years and merged into a feature class (MA_shorelines_ST) to calculate short-term shoreline change. All files were projected to UTM zone 19N coordinates and confirmed to have the same attribute names needed for use in DSAS. Note the range of shoreline dates will vary by location. Please check the intersect file attributes for a record of the exact dates used.
This process step and all subsequent process steps were performed by the same person: Marie K. Bartlett
MA 1844 - 2018 Shorelines
2020
MA_shorelines_LT
MA_shorelines_ST
Marie K. Bartlett
U.S. Geological Survey
Geologist
mailing and physical
384 Woods Hole Road
Woods Hole
MA
02543
USA
508-548-8700 x2306
mbartlett@usgs.gov
Transect features generated in a personal geodatabase using DSAS v5.1.2020.0720.0030. Parameters Used: baseline layer= SouthCape_baseline, baseline group field=DSAS_group, transect spacing=50 meters, search distance=200 meters, land direction=left, shoreline intersection=seaward, File produced = SouthCape_transects_LT. For additional details on these parameters, please see the DSAS help file distributed with the DSAS software, or visit the USGS website at: https://www.usgs.gov/centers/whcmsc/science/digital-shoreline-analysis-system-dsas. Some transects were manually edited for length, moved, or deleted in an edit session using standard editing tools in ArcMap v10.7.1
MA_shorelines_LT
SouthCape_baseline
2020
SouthCape_transects_LT
Shoreline intersects and rate calculations performed for long-term rates with and without bias. Parameters Used: shoreline layer= MA_shorelines_LT, shoreline date field=Date_, shoreline uncertainty field name=Uncy, the default accuracy=10 meters, shoreline intersection=seaward, stats calculations=[SCE, NSM, LRR], shoreline threshold=3, confidence interval=90%. Files produced = SouthCape_trans_LT_rates_20210706_135410, SouthCape_intersects_LT_20210706_135410.
NOTE: All shorelines have an uncertainty value listed in the attribute table that provides the horizontal uncertainty associated with the shoreline, regardless of the method used. The shoreline database contains both MHW and HWL shorelines. Therefore, a proxy-datum bias (PDB), stored as a line feature class appended to the reference baseline, is applied during rate calculation. For more information about the origin of the proxy-datum bias, see Ruggiero and List (2009). Rate statistics are presented with both the PDB applied, and with the bias omitted, in which case the attribute field will show “NB_” or “No bias”. The bias uncertainty values are stored within the bias feature attribute table.
MA_shorelines_LT
SouthCape_transects_LT
2021
SouthCape_trans_rates_LT
SouthCape_intersects_LT
Transect features generated in a personal geodatabase using DSAS v5.1.2020.0720.0030. Parameters Used: baseline layer= SouthCape_baseline, baseline group field=DSAS_group, transect spacing=50 meters, search distance=200 meters, land direction=left, shoreline intersection=seaward, File produced = SouthCape_transects_ST. For additional details on these parameters, please see the DSAS help file distributed with the DSAS software, or visit the USGS website at: https://www.usgs.gov/centers/whcmsc/science/digital-shoreline-analysis-system-dsas Some transects were manually edited for length, moved, or deleted in an edit session using standard editing tools in ArcMap v10.7.1.
MA_shorelines_ST
SouthCape_baseline
2021
SouthCape_transects_ST
Shoreline intersects and rate calculations performed for long-term rates with and without bias. Parameters Used: shoreline layer= MA_shorelines_ST, shoreline date field=Date_, shoreline uncertainty field name=Uncy, the default accuracy=5.1 meters, shoreline intersection=seaward, stats calculations=[SCE, NSM, EPR LRR], shoreline threshold=2, confidence interval=90%. Files produced = SouthCape_trans_rates_ST_20210706_141639, SouthCape_intersects_ST_20210706_141639. NOTE: All shorelines have an uncertainty value listed in the attribute table that provides the horizontal uncertainty associated with the shoreline, regardless of the method used. The shoreline database contains both MHW and HWL shorelines thus a proxy-datum bias (PDB), stored as a line feature class appended to the reference baseline, is applied during rate calculation. For more information about the origin of the proxy-datum bias, see Ruggiero and List (2009). Rate statistics are presented with both the PDB applied, and with the bias omitted, in which case the attribute field will show “NB_” or “No bias”. The bias uncertainty values are stored within the bias feature attribute table.
MA_shorelines_ST
SouthCape_transects_ST
2021
SouthCape_trans_rates_ST
SouthCape_intersects_ST
The intersect feature classes were exported to shapefiles in ArcMap v10.7.1 by right-clicking the transect layer > Data > Export data.
2021
The exported intersect shapefiles were projected in Esri's ArcToolbox (v10.7.1) > Data Management Tools > Projections and Transformations > Project. Parameters: input projection = UTM zone 19N (WGS84); output projection = geographic coordinates (WGS84); transformation = none.
SouthCape_intersects_LT
SouthCape_intersects_ST
2021
SouthCape_intersects_LT
SouthCape_intersects_ST
Vector
String
0.0197414479
0.0262710586
Decimal seconds
WGS_1984
WGS_1984
6378137.000000
298.257224
SouthCape_intersects_LT.shp
The intersection points are generated by DSAS where each DSAS generated transect crosses a shoreline. These intersections represent the shoreline position, and contain the data necessary for DSAS to compute long-term rates, with and without the proxy-datum bias. Point Object Count: 10512
USGS
FID
Internal feature number used as a unique identifier of an object within a table primarily used in shapefiles.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
The geometry field (shape) is automatically created and maintained by ArcGIS. It provides a definition of the feature type (point, line, polygon).
ESRI
Coordinates defining the features.
TransectID
The TransectID relates directly to the original transect file Object Identifier, ObjectID or OID
USGS
1
unlimited
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.
USGS
0
unlimited
BaselineID
Values in this field correlate to the baseline attribute field ID and are assigned by DSAS to identify the baseline segment used to generate the measurement transect. Baseline segments assigned an ID = 0 are ignored by DSAS and no transects will be cast along those line segments.
USGS
1
unlimited
ShorelineI
Date of shoreline position; date of survey as determined from shoreline layer.
USGS
Date of the shoreline in mm/dd/yyyy
Distance
The distance in meters between the DSAS reference baseline and the shoreline intersection point along a DSAS transect.
USGS
Decimal values may be positive or negative, which is used to indicate landward (negative) or seaward (positive) direction from baseline origin.
IntersectX
The X-coordinate location in eastings of the intersect point in WGS84 UTM19N.
USGS
361949.455423
418120.624476
IntersectY
The Y-coordinate location in northings of the intersect point in WGS84 UTM19N.
USGS
4597579.023420
4613934.661340
Uncertaint
The uncertainty of the shoreline intersect point as defined by the positional-uncertainty value (DSAS_uncy) of the shoreline (ShorelineID).
USGS
0
unlimited
Bias_Dista
The distance in meters between the DSAS reference baseline and the shoreline intersection point along a DSAS transect with the proxy-datum bias applied. May be positive or negative depending on the orientation of the baseline.
USGS
-183.177033
207.029730
BIAS
The estimated unidirectional horizontal offset between the MHW elevation of the lidar data and the HWL shoreline position.
USGS
0
unlimited
BIAS_X
The X-coordinate location of the intersect point with the bias applied.
USGS
361949.456400
418120.623984
BIAS_Y
The Y-coordinate location of the intersect point with the bias applied.
USGS
4597579.023210
4613934.661340
Bias_Uncer
This is an estimate of the uncertainty of the bias corrected shoreline. It is the shoreline uncertainty and the bias uncertainty added in quadrature.
USGS
0
unlimited
SouthCape_intersects_ST.shp
The intersection points are generated by DSAS where each DSAS generated transect crosses a shoreline. These intersections represent the shoreline position, and contain the data necessary for DSAS to compute short-term rates, with and without the proxy-datum bias. Point Object Count: 7417
USGS
FID
Internal feature number used as a unique identifier of an object within a table primarily used in shapefiles.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
The geometry field (shape) is automatically created and maintained by ArcGIS. It provides a definition of the feature type (point, line, polygon).
ESRI
Coordinates defining the features.
TransectID
The TransectID relates directly to the original transect file Object Identifier, ObjectID or OID
USGS
1
unlimited
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.
USGS
0
unlimited
BaselineID
Values in this field correlate to the baseline attribute field ID and are assigned by DSAS to identify the baseline segment used to generate the measurement transect. Baseline segments assigned an ID = 0 are ignored by DSAS and no transects will be cast along those line segments.
USGS
1
unlimited
ShorelineI
Date of shoreline position; date of survey as determined from shoreline layer.
USGS
Date of the shoreline in mm/dd/yyyy
Distance
The distance in meters between the DSAS reference baseline and the shoreline intersection point along a DSAS transect.
USGS
Decimal values may be positive or negative, which is used to indicate landward (negative) or seaward (positive) direction from baseline origin.
IntersectX
The X-coordinate location in eastings of the intersect point in WGS84 UTM19N.
USGS
361949.455423
418070.293821
IntersectY
The Y-coordinate location in northings of the intersect point in WGS84 UTM19N.
USGS
4597581.785320
4613934.661340
Uncertaint
The uncertainty of the shoreline intersect point as defined by the positional-uncertainty value (DSAS_uncy) of the shoreline (ShorelineID).
USGS
0
unlimited
Bias_Dista
The distance in meters between the DSAS reference baseline and the shoreline intersection point along a DSAS transect with the proxy-datum bias applied. May be positive or negative depending on the orientation of the baseline.
USGS
-183.177033
108.443292
BIAS
The estimated unidirectional horizontal offset between the MHW elevation of the lidar data and the HWL shoreline position.
USGS
0
unlimited
BIAS_X
The X-coordinate location of the intersect point with the bias applied.
USGS
361949.456400
418070.293328
BIAS_Y
The Y-coordinate location of the intersect point with the bias applied.
USGS
4597581.785100
4613934.661340
Bias_Uncer
This is an estimate of the uncertainty of the bias corrected shoreline. It is the shoreline uncertainty and the bias uncertainty added in quadrature.
USGS
0
unlimited
The entity and attribute information provided here describes the tabular data associated with the intersects needed to calculate long-term (greater than 50 years, and typically closer to 100 years) and short-term (approximately 30 years) shoreline change rates. Please review the individual attribute descriptions for detailed information. All calculations for length are in meter units and were based on the UTM zone 19N WGS 84 projection. This region has two shapefiles describing intersects, long-term and short-term.
U.S. Geological Survey-ScienceBase
U.S. Geological Survey - GS ScienceBase
mailing and physical address
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
United States
1-888-275-8747
sciencebase@usgs.gov
The dataset contains the point intersections used for the analysis of shoreline data, (SHP and other shapefile components), browse graphic, and the FGDC CSDGM metadata in XML format.
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. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), and have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Shapefile
ArcGIS 10.7.1
Esri point shapefile
These files (.cpg, .dbf, .prj, .sbn, .sbx, .shp, .shp., and .shx) are a collection of files with a common filename prefix and must be downloaded and stored in the same directory. Together they are the components of the shapefile and include FGDC CSDGM-compliant metadata.
no compression applied
1
https://www.sciencebase.gov/catalog/file/get/610a9ce0d34ef8d70568927c
https://www.sciencebase.gov/catalog/item/610a9ce0d34ef8d70568927c
https://doi.org/10.5066/P9YGIYFX
The first link downloads all the files on the dataset landing page. The second link is to the dataset landing page where individual files can be viewed and downloaded. The third link is to the data release main landing page.
None
These data are available in a point shapefile format. The user must have software to read and process the data components of a shapefile.
20210831
Marie K. Bartlett
U.S. Geological Survey
mailing and physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
508-548-8700 x2306
508-547-2310
mbartlett@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time