Intersects for Nantucket, Massachusetts, generated to calculate shoreline change rates using the Digital Shoreline Analysis System version 5.0

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?
   U.S. Geological Survey, 2019, Intersects for Nantucket, Massachusetts, generated to calculate shoreline change rates using the Digital Shoreline Analysis System version 5.0: data release DOI:10.5066/P9RRBEYK, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

   Online Links:

   • https://doi.org/10.5066/P9RRBEYK
   • https://www.sciencebase.gov/catalog/item/5c65ab2be4b0fe48cb38ff4e

   This is part of the following larger work.
   Himmelstoss, Emily A., Farris, Amy S., Weber, Kathryn M., and Henderson, Rachel E., 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: data release DOI:10.5066/P9RRBEYK, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.5066/P9RRBEYK
   • https://www.sciencebase.gov/catalog/item/5be5857ce4b0b3fc5cf8c6ca

   Other_Citation_Details:

   suggested citation: Himmelstoss, E.A., Farris, A.S., Weber, K.M., and Henderson, R.E., 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 (ver. 2.0, August 2019): U.S. Geological Survey data release, https://doi.org/10.5066/P9RRBEYK

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -70.319516
   East_Bounding_Coordinate: -69.959170
   North_Bounding_Coordinate: 41.391267
   South_Bounding_Coordinate: 41.237358
   

3. What does it look like?

   https://www.sciencebase.gov/catalog/file/get/5c65ab2be4b0fe48cb38ff4e/?name=Nantucket_intersects_browse.png (png)

   Map view of data

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 2019

   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?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (7870)
   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 0.0000001. Longitudes are given to the nearest 0.0000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      
7. How does the data set describe geographic features?

   Nantucket_south_PDB_LT_intersects.shp

   The intersection points are generated by DSAS where each DSAS generated transect crosses a shoreline. These intersections represent the shorelines used to compute long-term rates where the proxy-datum bias correction has been applied. (Source: U.S. Geological Survey)

   FID

   Internal feature number used as a unique identifier of an object within a table primarily used in shapefiles. (Source: 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). (Source: Esri) Coordinates defining the features.

   TransectID

   The TransectID relates directly to the original transect file Object Identifier, ObjectID or OID (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1
   Maximum:	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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1
   Maximum:	unlimited

   ShorelineI

   Date of shoreline position; date of survey as determined from shoreline layer. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	322800
   Maximum:	422900

   IntersectY

   The Y-coordinate location in northings of the intersect point in WGS84 UTM19N. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	4565600
   Maximum:	4748600

   Uncertaint

   The uncertainty of the shoreline intersect point as defined by the positional-uncertainty value (DSAS_uncy) of the shoreline (ShorelineID). (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   BIAS

   The estimated unidirectional horizontal offset between the MHW elevation of the lidar data and the HWL shoreline position. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   BIAS_X

   The X-coordinate location of the intersect point with the bias applied. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	322800
   Maximum:	422900

   BIAS_Y

   The Y-coordinate location of the intersect point with the bias applied. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	4565600
   Maximum:	4748600

   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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   Nantucket_north_NB_LT_intersects.shp

   The intersection points are generated by DSAS where each DSAS generated transect crosses a shoreline. These intersections represent the shorelines used to compute long-term rates where the proxy-datum bias correction has not been applied. (Source: U.S. Geological Survey)

   FID

   Internal feature number used as a unique identifier of an object within a table primarily used in shapefiles. (Source: Esri) Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: Esri) Coordinates defining the features.

   TransectID

   The TransectID relates directly to the original transect file Object Identifier, ObjectID or OID (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimitted

   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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimitted

   ShorelineI

   Date of shoreline position; date of survey as determined from shoreline layer. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	322800
   Maximum:	422900

   IntersectY

   The Y-coordinate location in northings of the intersect point in WGS84 UTM19N. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	4565600
   Maximum:	4748600

   Uncertaint

   The uncertainty of the shoreline position at the intersect point, as defined by the positional uncertainty attribute value (DSAS_uncy) of the shoreline. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   Nantucket_south_PDB_ST_intersects.shp

   The intersection points are generated by DSAS where each DSAS generated transect crosses a shoreline. These intersections represent the shorelines used to compute short-term rates where the proxy-datum bias correction has been applied. (Source: U.S. Geological Survey)

   FID

   Internal feature number used as a unique identifier of an object within a table primarily used in shapefiles. (Source: 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). (Source: Esri) Coordinates defining the features.

   TransectID

   The TransectID relates directly to the original transect file Object Identifier, ObjectID or OID (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1
   Maximum:	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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	1
   Maximum:	unlimited

   ShorelineI

   Date of shoreline position; date of survey as determined from shoreline layer. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	322800
   Maximum:	422900

   IntersectY

   The Y-coordinate location in northings of the intersect point in WGS84 UTM19N. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	4565600
   Maximum:	4748600

   Uncertaint

   The uncertainty of the shoreline intersect point as defined by the positional-uncertainty value (DSAS_uncy) of the shoreline (ShorelineID). (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   BIAS

   The estimated unidirectional horizontal offset between the MHW elevation of the lidar data and the HWL shoreline position. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   BIAS_X

   The X-coordinate location of the intersect point with the bias applied. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	322800
   Maximum:	422900

   BIAS_Y

   The Y-coordinate location of the intersect point with the bias applied. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	4565600
   Maximum:	4748600

   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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   Nantucket_north_NB_ST_intersects.shp

   The intersection points are generated by DSAS where each DSAS generated transect crosses a shoreline. These intersections represent the shorelines used to compute short-term rates where the proxy-datum bias correction has not been applied. (Source: U.S. Geological Survey)

   FID

   Internal feature number used as a unique identifier of an object within a table primarily used in shapefiles. (Source: Esri) Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: Esri) Coordinates defining the features.

   TransectID

   The TransectID relates directly to the original transect file Object Identifier, ObjectID or OID (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimitted

   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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimitted

   ShorelineI

   Date of shoreline position; date of survey as determined from shoreline layer. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey) 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. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	322800
   Maximum:	422900

   IntersectY

   The Y-coordinate location in northings of the intersect point in WGS84 UTM19N. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	4565600
   Maximum:	4748600

   Uncertaint

   The uncertainty of the shoreline position at the intersect point, as defined by the positional uncertainty attribute value (DSAS_uncy) of the shoreline. (Source: U.S. Geological Survey)

   Range of values
   Minimum:	0
   Maximum:	unlimited

   Entity_and_Attribute_Overview:

   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, as well as intersects that incorporate the known unidirectional offset between proxy-based high water line features and datum-based mean high water line features (the proxy-datum bias), and intersects that did not have the necessary information to correct for this offset (no bias). 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 four shapefiles describing intersects; long-term with bias, long-term without bias, short-term with bias, and short-term without bias.

   Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
   

Who produced the data set?

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

   Attn: Emily A. Himmelstoss

   384 Woods Hole Road

   Woods Hole, MA
   

   USA

   508-548-8700 x 2262 (voice)

   508-457-2310 (FAX)

   ehimmelstoss@usgs.gov

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?

   Date: 2018 (process 1 of 14)

   Process_Description: Transect features generated in a personal geodatabase using DSAS v5.0.20180906.1125. Parameters Used: baseline layer=Nantucket_north_baseline, baseline group field=NULL, transect spacing=50 meters, search distance=1000 meters, land direction=right, shoreline intersection=seaward, File produced = Nantucket_north_transect. For additional details on these parameters, please see the DSAS help file distributed with the DSAS software, or visit the USGS website at: https://woodshole.er.usgs.gov/project-pages/DSAS/.
   This process step and all subsequent process steps were performed by the same person - Emily A. Himmelstoss. Person who carried out this activity:
   

   Emily A. Himmelstoss

   U.S. Geological Survey

   384 Woods Hole Road

   Woods Hole, MA
   

   USA

   508-548-8700 x 2262 (voice)

   508-457-2310 (FAX)

   ehimmelstoss@usgs.gov

   Date: 2018 (process 2 of 14)

   Process_Description: Transect features generated in a personal geodatabase using DSAS v5.0.20180906.1125. Parameters Used: baseline layer=Nantucket_south_baseline, baseline group field=NULL, transect spacing=50 meters, search distance=1000 meters, land direction=right, shoreline intersection=seaward, File produced = Nantucket_south_transect.

   Date: 2018 (process 3 of 14)

   Some transects were manually edited for length, moved, or deleted in an edit session using standard editing tools in ArcMap v10.5.1

   Date: 2018 (process 4 of 14)

   Shoreline intersects and rate calculations performed for long-term rates with bias. Parameters Used: shoreline layer=Nantucket_LT_shorelines, shoreline date field=DSAS_date, shoreline uncertainty field name=Uncy, the default accuracy=4.4 meters, shoreline intersection=seaward, stats calculations=[LRR], shoreline threshold=3, confidence interval=90%. Files produced = Nantucket_PDB_LT_rates_20180406_150209, Nantucket_PDB_LT_intersect_20180406_150209.

   Date: 2018 (process 5 of 14)

   Shoreline intersects and rate calculations performed for long-term rates without bias. Parameters Used: shoreline layer=Nantucket_LT_shorelines, shoreline date field=DSAS_date, shoreline uncertainty field name=Uncy, the default accuracy=10 meters, shoreline intersection=seaward, stats calculations=[LRR], shoreline threshold=3, confidence interval=90%. Files produced = Nantucket_NB_LT_rates_20180406_134610, Nantucket_NB_LT_intersect_20180406_134610.

   Date: 2018 (process 6 of 14)

   Shoreline intersects and rate calculations performed for short-term rates with bias. Parameters Used: shoreline layer=Nantucket_ST_shorelines, shoreline date field=DSAS_date, shoreline uncertainty field name=Uncy, the default accuracy=4.4 meters, shoreline intersection=seaward, stats calculations=[LRR], shoreline threshold=3, confidence interval=90%. Files produced = Nantucket_PDB_ST_rates_20180406_143249, Nantucket_PDB_ST_intersect_20180406_143249.

   Date: 2018 (process 7 of 14)

   Shoreline intersects and rate calculations performed for short-term rates without bias. Parameters Used: shoreline layer=Nantucket_ST_shorelines, shoreline date field=DSAS_date, shoreline uncertainty field name=Uncy, the default accuracy=4.4 meters, shoreline intersection=seaward, stats calculations=[LRR], shoreline threshold=3, confidence interval=90%. Files produced = Nantucket_NB_ST_rates_20180406_140128, Nantucket_NB_ST_intersect_20180406_140128.

   Date: 2018 (process 8 of 14)

   The intersect feature classes were exported to shapefiles in ArcMap v10.5 by right-clicking the transect layer > data > export data.

   Date: 2018 (process 9 of 14)

   The exported intersect shapefiles were projected in Esri's ArcToolbox (v10.5) > Data Management Tools > Projections and Transformations > Project. Parameters: input projection - UTM zone 19N (WGS84); output projection - geographic coordinates (WGS84); transformation = none.

   Date: 22-May-2019 (process 10 of 14)

   After discovering that the 2013 was accidentally not used in the rate and intersects calculations for the north shore of Nantucket, the rates and intersects were recalculated using the 2013 shoreline. Shoreline intersects and rate calculations were recalculated for long-term rates without bias. Parameters Used: shoreline layer=Nantucket_LT_shorelines, shoreline date field=DSAS_date, shoreline uncertainty field name=Uncy, the default accuracy=10 meters, shoreline intersection=seaward, stats calculations=[LRR], shoreline threshold=3, confidence interval=90%. Files produced = Nantucket_NB_LT_rates_20190522_145813, Nantucket_NB_LT_intersect_20190522_145813.

   Date: 22-May-2019 (process 11 of 14)

   After discovering that the 2013 was accidentally not used in the rate and intersects calculations for the north shore of Nantucket, the rates and intersects were recalculated using the 2013 shoreline. Shoreline intersects and rate calculations were recalculated for short-term rates without bias. Parameters Used: shoreline layer=Nantucket_ST_shorelines, shoreline date field=DSAS_date, shoreline uncertainty field name=Uncy, the default accuracy=4.4 meters, shoreline intersection=seaward, stats calculations=[LRR], shoreline threshold=3, confidence interval=90%. Files produced = Nantucket_NB_ST_rates_20190522_145228, Nantucket_NB_ST_intersect_20190522_145228.

   Date: 22-May-2019 (process 12 of 14)

   The recalculated intersect feature classes were exported to shapefiles in ArcMap v10.5 by right-clicking the transect layer > data > export data.

   Date: 22-May-2019 (process 13 of 14)

   The recalculated exported intersect shapefiles were projected in Esri's ArcToolbox (v10.5) > Data Management Tools > Projections and Transformations > Project. Parameters: input projection - UTM zone 19N (WGS84); output projection - geographic coordinates (WGS84); transformation = none.

   Date: 10-Aug-2020 (process 14 of 14)

   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?
   Himmelstoss, Emily A., Farris, Amy S., Henderson, Rachel E., Kratzmann, Meredith G., Ergul, Ayhan, Zhang, Ouya, and Zichichi, Jessica L., 2018, Digital Shoreline Analysis System (version 5.0): U.S. Geological Survey Software: software release version 5.0, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://code.usgs.gov/cch/dsas/
   • https://doi.org/10.5066/P9VW42I0
   • https://woodshole.er.usgs.gov/project-pages/DSAS/

   Himmelstoss, Emily A., Henderson, Rachel E., Kratzmann, Meredith G., and Farris, Amy S., 2018, DSAS v5.0 user guide: Open-File Report 2018-1179, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.3133/ofr20181179
   • https://woodshole.er.usgs.gov/project-pages/DSAS/

   Himmelstoss, Emily A., Farris, Amy S., and Weber, Kathryn M., 2018, Massachusetts Shoreline Change Project: A GIS Compilation of Vector Shorelines for the 2018 update: data release DOI:10.5066/P9O7S72B, U.S. Geological Survey, Coastal and Marine Geology Program, Reston, VA.

   Online Links:

   • https://doi.org/10.5066/P9O7S72B
   • https://www.sciencebase.gov/catalog/item/5bcde5dce4b0f0758fc178d0
   • https://www.sciencebase.gov/catalog/file/get/5bcde5dce4b0f0758fc178d0

   Ruggiero, Peter, and List, Jeffrey H., 200909, Improving Accuracy and Statistical Reliability of Shoreline Position and Change Rate Estimates: Journal of Coastal Research vol. 255, Coastal Education and Research Foundation, n/a.

   Online Links:

   • https://doi.org/10.2112/08-1051.1

   Other_Citation_Details: ppg. 1069-1081
   

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

1. How well have the observations been checked?
   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.
2. How accurate are the geographic locations?
   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. See https://doi.org/10.5066/P9O7S72B
3. How accurate are the heights or depths?
   
4. Where are the gaps in the data? What is missing?
   This dataset contains all the shoreline/transect intersects used to compute rates in the DSAS v5.0 software application.
5. How consistent are the relationships among the observations, including topology?
   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.

How can someone get a copy of the data set?

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
   

   United States

   1-888-275-8747 (voice)

   sciencebase@usgs.gov
2. What's the catalog number I need to order this data set? 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 and TEXT format.
3. What legal disclaimers am I supposed to read?
   Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. 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.
4. How can I download or order the data?
   • Availability in digital form:

     Data format:	These files (.cpg, .dbf, .prj, .sbn, .sbx, .shp, .shp., xml, 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. in format Shapefile (version ArcGIS 10.5) Esri point shapefile Size: 2
     Network links:	https://www.sciencebase.gov/catalog/file/get/5c65ab2be4b0fe48cb38ff4e https://www.sciencebase.gov/catalog/item/5c65ab2be4b0fe48cb38ff4e https://doi.org/10.5066/P9RRBEYK

     Data format:	WMS (version 1.3.0) Web Mapping Services 1.3.0
     Network links:	https://www.sciencebase.gov/catalogMaps/mapping/ows/5c65ab2be4b0fe48cb38ff4e?service=wms&request=getcapabilities&version=1.3.0 https://www.sciencebase.gov/catalog/item/5c65ab2be4b0fe48cb38ff4e https://doi.org/10.5066/P9RRBEYK

     Data format:	WFS (version 1.0.0) Web Feature Services 1.0.0
     Network links:	https://www.sciencebase.gov/catalogMaps/mapping/ows/5c65ab2be4b0fe48cb38ff4e?service=wfs&request=getcapabilities&version=1.0.0 https://www.sciencebase.gov/catalog/item/5c65ab2be4b0fe48cb38ff4e https://doi.org/10.5066/P9RRBEYK

   • Cost to order the data: None

5. What hardware or software do I need in order to use the data set?
   These data are available in a point shapefile format. The user must have software to read and process the data components of a shapefile.

Who wrote the metadata?

Dates:

Last modified: 19-Mar-2024

Metadata author:

Emily A. Himmelstoss

U.S. Geological Survey

384 Woods Hole Road

Woods Hole, MA

USA

508-548-8700 x2262 (voice)

508-547-2310 (FAX)

whsc_data_contact@usgs.gov

Contact_Instructions:

The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240319)

Metadata standard:

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