Metadata: Identification_Information: Citation: Citation_Information: Originator: Marie K. Bartlett Publication_Date: 20230526 Title: Intersects for coastal region of Virginia generated to calculate short-term shoreline change rates using the Digital Shoreline Analysis System version 5.1 Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: data release Issue_Identification: doi:10.5066/P9DHOFXU Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program Online_Linkage: https://doi.org/10.5066/P9DHOFXU Online_Linkage: https://www.sciencebase.gov/catalog/item/641c681fd34e807d39b643b9 Larger_Work_Citation: Citation_Information: Originator: Marie K. Bartlett Originator: Rachel E. Henderson Originator: Amy S. Farris Publication_Date: 2023 Title: USGS National Shoreline Change — A GIS Compilation of Vector Shorelines and Associated Shoreline Change Data for Coastal Virginia from the 1840s to 2010s Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: data release Issue_Identification: doi:10.5066/P9DHOFXU Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Bartlett, M.K., Henderson R.E., and Farris, A.S., 2023, USGS National Shoreline Change—A GIS compilation of vector shorelines and associated shoreline change data for coastal Virginia from the 1840s to 2010s: U.S. Geological Survey data release, https://doi.org/10.5066/P9DHOFXU. Online_Linkage: https://doi.org/10.5066/P9DHOFXU Online_Linkage: https://www.sciencebase.gov/catalog/item/641b186fd34e4c337f0c1de3 Description: Abstract: The U.S. Geological Survey (USGS) has compiled national shoreline data for more than 20 years to document coastal change and serve the needs of research, management, and the public. Maintaining a record of historical shoreline positions is an effective method to monitor national shoreline evolution over time, enabling scientists to identify areas most susceptible to erosion or accretion. These data can help coastal managers and planners understand which areas of the coast are vulnerable to change. This data release includes a compilation of previously published historical shoreline positions for Virginia spanning 148 years (1849-1997), and two new mean high water (MHW) shorelines extracted from lidar data collected in 2010 and 2017. These data provide a standardized shoreline database for the state. This release includes both long-term (up to 168 years) and short term (~20 years) rates. Files associated with the long-term and short-term rates are appended with "LT" and "ST", respectively. A proxy-datum bias reference line that accounts for the positional difference in a proxy shoreline (e.g. High Water Line (HWL) shoreline) and a datum shoreline (e.g. MHW shoreline) is also included in this release. Purpose: 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. 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 (TransOrder) as well as the shoreline (ShorelineID, Uncertainty) and proxy-datum bias data (if applicable). 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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1997 Ending_Date: 2017 Currentness_Reference: ground condition at the time of shoreline source data Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -76.0322 East_Bounding_Coordinate: -75.4158 North_Bounding_Coordinate: 37.8757 South_Bounding_Coordinate: 36.5504 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: environment Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Baseline Theme_Keyword: Shoreline Theme_Keyword: Shoreline Change Theme_Keyword: Digital Shoreline Analysis System Theme_Keyword: DSAS Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: long-term change Theme_Keyword: North America Theme_Keyword: Mid-Atlantic Theme_Keyword: short-term change Theme_Keyword: erosion Theme_Keyword: accretion Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: coastal processes Theme_Keyword: geospatial datasets Theme_Keyword: erosion Theme_Keyword: shoreline accretion Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:641c681fd34e807d39b643b9 Place: Place_Keyword_Thesaurus: None Place_Keyword: Atlantic Coast Place_Keyword: Virginia Place_Keyword: United States Access_Constraints: None. Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. These data are not to be used for navigation. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Marie K. Bartlett Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing Address: 384 Woods Hole Rd City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-457-8700 x2306 Contact_Electronic_Mail_Address: mbartlett@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/641c681fd34e807d39b643b9?name=VA_intersects_ST_browse.JPG Browse_Graphic_File_Description: Map view of dataset Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Microsoft Windows 10 Esri ArcGIS 10.7.1 Cross_Reference: Citation_Information: Originator: Emily A. Himmelstoss Originator: Amy S. Farris Originator: Rachel E. Henderson Originator: Meredith G. Kratzmann Originator: Ayhan Ergul Originator: Ouya Zhang Originator: Jessica L. Zichichi Originator: E. Robert Thieler Publication_Date: 2021 Title: Digital Shoreline Analysis System (version 5.1): U.S. Geological Survey Software Geospatial_Data_Presentation_Form: publication Series_Information: Series_Name: software release Issue_Identification: version 5.1 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Use the first two links to access the software. The third link directs to the DSAS project page. Current version of software at time of use was 5.1. Online_Linkage: https://doi.org/10.5066/P9VW42I0 Online_Linkage: https://code.usgs.gov/cch/dsas/ Online_Linkage: https://woodshole.er.usgs.gov/project-pages/DSAS/ Cross_Reference: Citation_Information: Originator: Emily A. Himmelstoss Originator: Rachel E. Henderson Originator: Meredith G. Kratzmann Originator: Amy S. Farris Publication_Date: 20211019 Title: Digital Shoreline Analysis System (version 5.1) User Guide Geospatial_Data_Presentation_Form: publication Series_Information: Series_Name: Open-File Report Issue_Identification: 2021-1091 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Refer to the DSAS user guide for more information about attribute requirements, accuracy reports, and feature creation. Online_Linkage: https://doi.org/10.3133/ofr20211091 Online_Linkage: https://woodshole.er.usgs.gov/project-pages/DSAS/ Cross_Reference: Citation_Information: Originator: Peter Ruggiero Originator: Jeffrey H. List Publication_Date: 200909 Title: Improving Accuracy and Statistical Reliability of Shoreline Position and Change Rate Estimates Geospatial_Data_Presentation_Form: publication Series_Information: Series_Name: Journal of Coastal Research Issue_Identification: vol. 255 Publication_Information: Publication_Place: n/a Publisher: Coastal Education and Research Foundation Other_Citation_Details: ppg. 1069-1081 Online_Linkage: https://doi.org/10.2112/08-1051.1 Cross_Reference: Citation_Information: Originator: Cheryl J. Hapke Originator: Emily A. Himmelstoss Originator: Meredith G. Kraztmann Originator: Jeffrey H. List Originator: E. Robert Thieler Publication_Date: 20120423 Title: National Assessment of Shoreline Change: Historical Shoreline Change along the New England and Mid-Atlantic Coasts Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 2010-1118 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://pubs.usgs.gov/of/2010/1118/ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 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. Logical_Consistency_Report: These data were generated using DSAS v5.1, 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-term (LT) or short-term (ST) shoreline change analysis. It is possible that a small (centimeter-scale) offset may occur when projecting from outside of the spatial reference system used for analysis (UTM Zone 18N WGS84). This is an ArcGIS projection issue; rate data are unaffected. Completeness_Report: This dataset contains the transects automatically generated by the DSAS software application that were used to calculate shoreline change rates for the region. Additional transects may have been generated but did not intersect the minimum requirement of three shorelines. Shoreline change rates data are provided where there are available shorelines to compute change metrics. Gaps in the lidar coverage may mean not every transect intersects each shoreline date, resulting in gaps in the rates. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The intersection points represent the location where transects cast by the Digital Shoreline Analysis System (DSAS) software crosses a historical shoreline position. The positional uncertainties associated with the shoreline and intersection points are captured in the shoreline attribute table. Lineage: Process_Step: Process_Description: A polyline, midshore baseline was constructed using standard feature creation tools in Esri's ArcMap v10.7.1. The baseline was positioned to follow to the overall orientation of the shorelines alongshore (see larger work citation, VA_baseline.shp, VA_shorelines.shp). This was done so that the transects, which are generated by the Digital Shoreline Analysis System and extend from the baseline, would intersect roughly perpendicular to the general trend of the shorelines. The baseline was constructed in UTM zone 18N (WGS 84) coordinate system. This process step and all subsequent process steps were performed by the same person - Marie K. Bartlett Process_Date: 2022 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Marie K. Bartlett Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x 2306 Contact_Electronic_Mail_Address: mbartlett@usgs.gov Process_Step: Process_Description: To calculate short-term rates, only lidar-based, MHW shorelines (1997-2017) were used for transect generation. This subset of shorelines was exported from VA_shorelines and renamed VA_shorelines_ST. Short-term transect features were generated in a personal geodatabase using DSAS v5.1.2020.0720.0030. Parameters Used: baseline layer = VA_baseline, shoreline layer = VA_shorelines_ST, baseline group field = NULL, transect spacing=50 meters, search distance = 1000 meters, land direction = right, shoreline intersection = seaward, File produced = VA_transects_ST. Some transects were manually edited for length, moved, or deleted in an edit session using standard editing tools in ArcMap v10.7.1. 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/ Process_Date: 2022 Process_Step: Process_Description: Shoreline intersects and rate calculations were performed for short-term rates without bias. Parameters Used: shoreline layer = VA_shorelines_ST shoreline date field = Date_, shoreline uncertainty field name = Uncy, the default accuracy = 5.1 meters, shoreline intersection = seaward, stats calculations = [LRR], shoreline threshold = 2, confidence interval = 90%. Files produced = VA_trans_ST_rates_20221208_145953, VA_trans_ST_intersect_20221208_145953. Note: Only MHW shorelines were used in analysis (1997-2017) so the proxy-datum bias was not applied. Process_Date: 2022 Process_Step: Process_Description: The intersect feature classes were exported to shapefiles in ArcMap v10.7.1 by right-clicking the transect layer > data > export data. Coordinate System: UTM Zone 18N (WGS84) Process_Date: 2023 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 4560 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 18 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -75.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.6096 Ordinate_Resolution: 0.6096 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: WGS_1984 Ellipsoid_Name: WGS_84 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: VA_intersects_ST.shp Attribute Table Entity_Type_Definition: 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. Because only modern, MHW lidar shorelines were used to calculate short-term rates, the proxy-datum bias calculation does not apply. Entity_Type_Definition_Source: U.S. Geological Survey (USGS) Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Feature geometry. Intersects are point shapefiles. Attribute: Attribute_Label: TransOrder Attribute_Definition: 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. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 494 Range_Domain_Maximum: 3360 Attribute: Attribute_Label: BaselineID Attribute_Definition: 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. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2 Range_Domain_Maximum: 14 Attribute: Attribute_Label: ShorelineI Attribute_Definition: Date of shoreline position; date of survey as determined from shoreline layer. Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Date of the shoreline in mm/dd/yyyy Attribute: Attribute_Label: Distance Attribute_Definition: The distance in meters between the DSAS reference baseline and the shoreline intersection point along a DSAS transect. Decimal values may be positive or negative, which is used to indicate landward (negative) or seaward (positive) direction from baseline origin. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -996.629 Range_Domain_Maximum: 638.589 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: IntersectX Attribute_Definition: The easting or X-coordinate location of the intersect point in WGS84 UTM18N. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 409220.948 Range_Domain_Maximum: 462788.999 Attribute: Attribute_Label: IntersectY Attribute_Definition: The northing or Y-coordinate location of the intersect point in WGS84 UTM18N. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4045475.673 Range_Domain_Maximum: 4192105.297 Attribute: Attribute_Label: Uncertaint Attribute_Definition: The uncertainty of the shoreline intersect point as defined by the positional-uncertainty value (Uncy_) of the shoreline (ShorelineID) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.662 Range_Domain_Maximum: 16.327 Overview_Description: Entity_and_Attribute_Overview: The entity and attribute information provided here describes the tabular data associated with the intersects needed to calculate short-term (approximately 20 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 18N WGS 84 projection. This region has two shapefiles describing intersects, long-term (LT) and short-term (ST). Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: GS ScienceBase Contact_Address: Address_Type: mailing address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: United States Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: The dataset contains the point data representing the intersection of Virgina shorelines and transect data (VA_intersects_ST.shp and other shapefile components), browse graphic (VA_intersects_ST_browse.JPG), and the FGDC CSDGM metadata in XML format. Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile Format_Version_Number: ArcGIS 10.7.1 Format_Specification: Esri Point Shapefile Format_Information_Content: These files (.cpg, .dbf, .prj, .sbn, .sbx, .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. Additional files of the same name included are FGDC CSDGM-compliant metadata in XML format. Transfer_Size: 0.21 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/item/641c681fd34e807d39b643b9 Fees: None. Metadata_Reference_Information: Metadata_Date: 20230526 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Marie K. Bartlett Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical Address: 384 Woods Hole Rd City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2306 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998