Bias feature containing proxy-datum bias information to be used in the Digital Shoreline Analysis System for the northern coast of North Carolina from the Virginia border to Cape Hatteras (NCnorth)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Rachel E. Henderson
Originator: Amy S. Farris
Publication_Date: 20231023
Title:
Bias feature containing proxy-datum bias information to be used in the Digital Shoreline Analysis System for the northern coast of North Carolina from the Virginia border to Cape Hatteras (NCnorth)
Edition: 1.0
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: data release
Issue_Identification: doi:10.5066/P9HYNUNV
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/P9HYNUNV
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Marie K. Bartlett
Originator: Amy S. Farris
Originator: Kathryn M. Weber
Originator: Rachel E. Henderson
Publication_Date: 2023
Title:
USGS National Shoreline Change — 2017 lidar-derived mean high water shoreline and associated shoreline change data for coastal North Carolina
Edition: 1
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: data release
Issue_Identification: doi:10.5066/P9HYNUNV
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Bartlett, M.K., Farris, A.S., Weber, K.M., and Henderson, R.E., 2023, USGS National Shoreline Change — 2017 lidar-derived mean high water shoreline and associated shoreline change data for coastal North Carolina: U.S. Geological Survey data release, https://doi.org/P9HYNUNV.
Online_Linkage: https://doi.org/10.5066/P9HYNUNV
Online_Linkage:
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 one new mean high water (MHW) shoreline extracted from lidar data collected in 2017 for the entire coastal region of North Carolina which is divided into four subregions: northern North Carolina (NCnorth), central North Carolina (NCcentral), southern North Carolina (NCsouth), and western North Carolina (NCwest). Previously published historical shorelines for North Carolina (Kratzmann and others, 2017) were combined with the new lidar shoreline to calculate long-term (up to 169 years) and short-term (up to 20 years) rates of change. 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 documents the proxy-datum bias (PDB) value and the uncertainty in the PDB. The "bias feature" is a shapefile representation the proxy-datum bias (PDB) data previously published in tabular format (Himmelstoss and others, 2010, Himmelstoss and others, 2018). These PDB data are used to shift older proxy-based shorelines so that they can be directly compared to newer datum-based shorelines and accurate rates can be calculated.
Supplemental_Information:
Cross-referenced citations are applicable to the dataset as a whole. Additional citations are located within individual process steps that pertain specifically to the method described in that step.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2018
Currentness_Reference: ground condition at the time of elevation source data
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.868682
East_Bounding_Coordinate: -75.460050
North_Bounding_Coordinate: 36.557632
South_Bounding_Coordinate: 35.216388
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: National Oceanic and Atmospheric Administration
Theme_Keyword: NOAA
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: Coastal Services Center
Theme_Keyword: CSC
Theme_Keyword: USGS National Shoreline Change Project
Theme_Keyword: Digital Shoreline Analysis System
Theme_Keyword: DSAS
Theme_Keyword: proxy-datum bias
Theme_Keyword: PDB
Theme_Keyword: mean high water
Theme_Keyword: MHW
Theme_Keyword: high water line
Theme_Keyword: HWL
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geospatial datasets
Theme_Keyword: coastal processes
Theme_Keyword: erosion
Theme_Keyword: shoreline accretion
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:64dfb34ad34e5f6cd553bf4c
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: Atlantic Coast
Place_Keyword: North Carolina
Access_Constraints: None
Use_Constraints:
These data were generated for use within the Digital Shoreline Analysis System (DSAS) v5.1 software, with shoreline data that has both mean high water (MHW) and high water line (HWL) data types present. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. These data should not be used for any purpose other than that for which they are intended. The United States Geological Survey does not guarantee its validity. Assumptions, analyses, opinions, and actual outcomes may vary. The user should always verify actual data and exercise their own professional judgment when interpreting any outcomes. 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_Organization_Primary:
Contact_Organization: Rachel E. Henderson
Contact_Address:
Address_Type: mailing and physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: US
Contact_Voice_Telephone: 508-548-8700
Contact_Facsimile_Telephone: 508-547-2310
Contact_Electronic_Mail_Address: rehenderson@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description: Map view of the bias dataset for the region.
Browse_Graphic_File_Type: PNG
Native_Data_Set_Environment: Microsoft Windows 10, Esri ArcGIS 10.7.1
Cross_Reference:
Citation_Information:
Originator: Cheryl J. Hapke
Originator: Emily A. Himmelstoss
Originator: Meredith G. Kratzmann
Originator: Jeffrey List
Originator: E. Robert Thieler
Publication_Date: 20100101
Title:
National Assessment of Shoreline Change: Historical Shoreline Change along the New England and Mid-Atlantic Coasts
Series_Information:
Series_Name: open file report
Issue_Identification: 2010-1118
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: : U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: https://doi.org/10.3133/ofr20101118
Online_Linkage: http://pubs.usgs.gov/of/2010/1118/
Cross_Reference:
Citation_Information:
Originator: Meredith G. Kratzmann
Originator: Emily A. Himmelstoss
Originator: E. Robert Thieler
Publication_Date: 2017
Title:
National assessment of shoreline change – A GIS compilation of updated vector shorelines and associated shoreline change data for the Southeast Atlantic Coast
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: data release
Issue_Identification: doi:10.5066/F74X55X7
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F74X55X7
Cross_Reference:
Citation_Information:
Originator: Emily A. Himmelstoss
Originator: Meredith G. Kratzmann
Originator: E. Robert Thieler
Publication_Date: 2017
Title:
National assessment of shoreline change—Summary statistics for updated vector shorelines and associated shoreline change data for the Gulf of Mexico and Southeast Atlantic coasts
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2017-1015
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.3133/ofr20171015
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: 2018
Title:
Digital Shoreline Analysis System (version 5.1): U.S. Geological Survey Software
Geospatial_Data_Presentation_Form: software
Series_Information:
Series_Name: Software
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 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:
Cross_Reference:
Citation_Information:
Originator: Emily A. Himmelstoss
Originator: Rachel E. Henderson
Originator: Meredith G. Kratzmann
Originator: Amy S. Farris
Publication_Date: 2021
Title: Digital Shoreline Analysis System (DSAS) Version 5.1 User Guide
Geospatial_Data_Presentation_Form: Open-File Report
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:
Use the first two links to access the user guide. The third link directs to the DSAS project page.
Online_Linkage: https://doi.org/10.3133/ofr20211091
Online_Linkage: https://pubs.er.usgs.gov/publication/ofr20211091
Online_Linkage:
Cross_Reference:
Citation_Information:
Originator: Hillary F. Stockdon
Originator: Asbury H. Sallenger
Originator: Jeffrey H. List
Originator: Rob A. Holman
Publication_Date: 2002
Title:
Estimation of shoreline position and change using airborne topographic lidar data
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: Journal of Coastal Research
Issue_Identification: vol. 18
Publication_Information:
Publication_Place: Charlotte, NC
Publisher: Coastal Education and Research Foundation
Other_Citation_Details:
Suggested citation: Stockdon, H.F., Sallenger, A.H., List, J.H., and Holman, R.A., 2002, Estimation of shoreline position and change using airborne topographic lidar data:  Journal of Coastal Research, v.18, no. 3, p. 502-513., https://www.jstor.org/stable/4299097
Online_Linkage: https://www.jstor.org/stable/4299097
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: Charlotte, NC
Publisher: Coastal Education and Research Foundation
Other_Citation_Details: ppg. 1069-1081
Online_Linkage: https://doi.org/10.2112/08-1051.1
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The attributes in this feature class document the positional and measurement uncertainties and datum offsets calculated from averaged slope data (2010-2018) and local wave data. The field names are based on the requirements for use within the Digital Shoreline Analysis System (DSAS) software (Himmelstoss and others, 2018).
Logical_Consistency_Report:
Each line segment is a copy of the polyline baseline data for the area (which is also available in this data release). The proxy-datum bias and bias uncertainty for each line segment are calculated using the slope data from available lidar surveys for the area (see process steps for details). Attributes populated include numerical values for adjusted bias (bias) and bias uncertainty (bias_uncy).
Completeness_Report:
The feature contains bias and uncertainty data where lidar data was available for the area. Adjustments were made where necessary after a visual inspection of the coastal shoreline type using high resolution digital imagery. Areas where bias is applied include open ocean sandy shorelines. Areas where bias was not applied include areas in close proximity to inlets, back barrier or marsh areas, rocky headlands and shoreline protection structures. In some cases, the bias was adjusted to match adjacent bias values with similar morphology.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The horizontal location of the bias feature is coincident with the DSAS baseline. The baseline serves as a reference point for transects cast by the DSAS software. The baseline and bias feature do not correspond to any real-world feature.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information
Publication_Date: 20181105
Title: U.S. Wave Information Study
Edition: DSI-9787
Geospatial_Data_Presentation_Form: historical digital dataset
Publication_Information:
Publication_Place: 151 Patton Avenue, Asheville, NC
Publisher: User Engagement and Services Branch
Other_Citation_Details: Data downloaded in 2005 for comuptation of regional average
Online_Linkage: https://wis.erdc.dren.mil/index.html
Type_of_Source_Media: Digital
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19900101
Ending_Date: 20000101
Source_Currentness_Reference: range of dates used to determine historical average
Source_Citation_Abbreviation: WIS wave data
Source_Contribution:
Multiple WIS stations closet to the location of interest were used to generate an average wave height value
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA Office for Coastal Management (NOAA/OCM)
Publication_Date: 2023
Title: National Data Buoy Center
Publication_Information:
Publication_Place: Charleston, SC
Publisher: Office for Coastal Management
Other_Citation_Details: Data downloaded in 2005 for comuptation of regional average
Online_Linkage: https://www.ndbc.noaa.gov/
Type_of_Source_Media: Digital
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2023
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: buoy data
Source_Contribution:
Mulitiple bouy locations near the region of interest were used to calculate average deep water wave length.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA Office for Coastal Management (NOAA/OCM)
Publication_Date: 20000101
Title:
1997 Fall East Coast NOAA/USGS/NASA Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for the US Coastline
Edition: 1.0
Geospatial_Data_Presentation_Form: LAS data
Publication_Information:
Publication_Place: Charleston, SC
Publisher: Office for Coastal Management
Other_Citation_Details: Data acccessed/downloaded in 2022
Online_Linkage: https://www.fisheries.noaa.gov/inport/item/48148
Online_Linkage: Online_Linkage:
Type_of_Source_Media: Digital and/or Hardcopy
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19970915
Ending_Date: 19971002
Source_Currentness_Reference: ground condition at the time of survey
Source_Citation_Abbreviation: 1997 NC Lidar
Source_Contribution:
Point cloud data used to extract the 1997 MHW shoreline position and calculate slope around MHW along a profile.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA Office for Coastal Management (NOAA/OCM)
Publication_Date: 20131030
Title:
2010 US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX) Southeast Lidar: Florida, Georgia, South Carolina, North Carolina
Edition: 1
Geospatial_Data_Presentation_Form: LAS data
Publication_Information:
Publication_Place: Charleston, SC
Publisher: Office for Coastal Management
Other_Citation_Details: Data acccessed/downloaded in 2022
Online_Linkage: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1070
Online_Linkage:
Type_of_Source_Media: Digital and/or Hardcopy
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100504
Ending_Date: 20100616
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 2010 NC Lidar
Source_Contribution:
Point cloud data used to extract the 2010 MHW shoreline position and calculate slope around MHW along a profile.
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA Office for Coastal Management (NOAA/OCM)
Publication_Date: 20220809
Title:
2017 USACE NCMP Topobathy Lidar: East Coast (NY, NJ, DE, MD, VA, NC, SC, GA)
Edition: 1
Geospatial_Data_Presentation_Form: LAS data
Publication_Information:
Publication_Place: Charleston, SC
Publisher: Office for Coastal Management
Other_Citation_Details: Data acccessed/downloaded in 2022
Online_Linkage: https://www.fisheries.noaa.gov/inport/item/52444
Online_Linkage:
Type_of_Source_Media: Digital
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20170609
Ending_Date: 20170907
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 2017 NC Lidar
Source_Contribution:
Point cloud data used to extract the 2017 MHW shoreline position and calculate slope around MHW along a profile.
Process_Step:
Process_Description:
Step 1: The proxy-datum bias calculation uses data acquired in the processing for the profile method of shoreline extraction to determine the slope (and uncertainty) around the shoreline position. Similar to the method developed by Stockdon and others (2002) an elevation-based shoreline is extracted from point cloud lidar data using a Matlab-based approach (Matlab version 2015b). Using a coast-following reference line with 20 m spaced cross shore profiles, lidar data is analyzed within a two-meter swath around each shore-perpendicular profile. This method is used to extract the mean high water (MHW) shoreline, as well as slope and uncertainty information. For North Carolina, the slope and uncertainty information at each profile was averaged over time using data from the years 1997, 2010 and 2017 where available.
Stockdon, H.F., Sallenger, A.H., List, J.H., and Holman, R.A., 2002, Estimation of shoreline position and change using airborne topographic lidar data:  Journal of Coastal Research, v.18, no. 3, p. 502-513. [Also available at https://www.jstor.org/stable/4299097]
Source_Used_Citation_Abbreviation: 1997 NC Lidar
Source_Used_Citation_Abbreviation: 2010 NC Lidar
Source_Used_Citation_Abbreviation: 2017 NC Lidar
Process_Date: 2022
Source_Produced_Citation_Abbreviation: avg slope data
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Amy S. Farris
Contact_Position: Oceanographer
Contact_Address:
Address_Type: mailing and physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: US
Contact_Voice_Telephone: 508-548-8700 x2344
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: afarris@usgs.gov
Process_Step:
Process_Description:
Step 2: There is a known horizontal offset between the datum-based lidar MHW shoreline and the proxy-based historical shorelines on open-ocean sandy beaches that nearly always acts in one direction (Ruggiero and List, 2009). This bias is called the proxy-datum bias (PDB). The PDB is primarily due to wave run-up and thus is affected by the slope of the foreshore and the movement of water (waves, tides) onto the foreshore, see equation for the PDB and the PDB uncertainty in Ruggiero and List, 2009. These equations require beach slope and wave data. Ideally data collected at the time the proxy-based shoreline was collected would be used. For our purposes the PDB is estimated by averaging all available slope data (described in step 1) and averaging at least 10 years of historical wave data to determine 1) the average deep water wavelengh for the region (from bouy data - https://www.ndbc.noaa.gov/) and 2) the average wave height for the region (from the U.S. Wave Information Study - https://wis.erdc.dren.mil/index.html) The resulting values for PDB and PDB uncertainty are stored to a point shapefile at the intersection of the each profile with the coast-following reference line.
Ruggiero, P., and List, J.H., 2009, Improving accuracy and statistical reliability of shoreline position and change rate estimates: Journal of Coastal Research, v. 25, no. 5, p. 1069-1081. [Also available at https://www.jstor.org/stable/27752753]
National Data Buoy Center, National Oceanic and Atmospheric Administration (NOAA) Stennis Space Center, MS 39529 https://www.ndbc.noaa.gov/
U.S. Wave Information Study, DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce, https://wis.erdc.dren.mil/index.html
Source_Used_Citation_Abbreviation: avg slope data
Source_Used_Citation_Abbreviation: buoy data
Source_Used_Citation_Abbreviation: WIS wave data
Process_Date: 2022
Source_Produced_Citation_Abbreviation: bias point data
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Amy S. Farris
Contact_Position: Oceanographer
Contact_Address:
Address_Type: mailing and physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: US
Contact_Voice_Telephone: 508-548-8700 x2344
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: afarris@usgs.gov
Process_Step:
Process_Description:
Step 3: To be used with DSAS, the data from the bias points must be connected to a shapefile that is near or adjacent to the DSAS baseline. However, the resulting bias points from the lidar shoreline extraction do not always fall near the baseline. The following steps (Step 4 - Step 9) detail how a series of transects are created to connect the point bias data to a coast following polyline feature. The following process steps were performed by the same person, Rachel E. Henderson.
Process_Date: 2022
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Rachel E. Henderson
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2600
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: rhenderson@usgs.gov
Process_Step:
Process_Description:
Step 4. A personal geodatabase was created and the baseline and sample shorelines for the project area were added (see larger work citation for data). Using DSAS v5.1, the default parameters were set for midshore baseline. Transects were cast using 20-meter spacing, a search distance of 1000 meters, and smoothing distance of 2000 meters. Once cast, the transects were evaluated with the original bias points to ensure the transects overlapped with the bias points and baseline. If needed, the transects were recast with a larger search distance.
Process_Date: 2022
Source_Produced_Citation_Abbreviation: transects
Process_Step:
Process_Description:
Step 5. The data from the original bias points (created in step 2) are transferred to the transects, using the ArcTool “Spatial Join”. The resulting Bias_transect contains all the original bias information. The Bias_transect is then converted to a midpoint using the ArcTool "Feature Vertices to Points" and selecting the midpoint option. As the transects were cast with the midshore baseline options, the midpoint will intersect the baseline. The resulting Bias_midpoint, contains all the original bias information.
Source_Used_Citation_Abbreviation: bias point data
Source_Used_Citation_Abbreviation: transects
Process_Date: 2022
Source_Produced_Citation_Abbreviation: Bias_midpoint
Process_Step:
Process_Description:
Step 6. A copy of the baseline is created, and split into 20-meter increments, to match the spacing and detail of the bias_midpoint feature. Points spaced at 20 meters along the original baseline were created using the ArcTool "Generate Points along Lines" at a distance of 20 meters. Then the ArcTool "Split Line at Point" was used with the copy of the baseline, to generate a new feature that has 20 meter segments: Feature_20m.
Source_Used_Citation_Abbreviation: Bias_midpoint
Process_Date: 2022
Source_Produced_Citation_Abbreviation: Feature_20m
Process_Step:
Process_Description:
Step 7. The data from Bias_midpoint are transferred to the new baseline Feature_20m, using the ArcTool “Spatial Join” resulting in a new polyline feature (Feature_wbias) containing all the original bias information, at 20 meter increments.
Source_Used_Citation_Abbreviation: bias point data
Process_Date: 2022
Source_Produced_Citation_Abbreviation: Feature_wbias
Process_Step:
Process_Description:
Step 8. The ArcTool "Unsplit Line" was used to reconnect any adjacent 20 meter segment with the same bias, and bias uncertainty values, reducing the number of small segments of bias feature. The final bias feature shapefile holds the bias and the bias uncertainty. These components are used by DSAS v5.1 to apply the proxy-datum bias correction to shoreline change calculations.
Source_Used_Citation_Abbreviation: Feature_wbias
Process_Date: 2022
Source_Produced_Citation_Abbreviation: Bias_Feature
Process_Step:
Process_Description:
Step 9. The Bias_Feature was imported into a personal geodatabase in ArcCatalog v10.7 by right-clicking on the geodatabase > Import > Feature class (single). The feature class is used with the Digital Shoreline Analysis System (DSAS) v5.1 software to apply the proxy-datum bias to rate calculations.
Process_Date: 2022
Process_Step:
Process_Description:
Step 10. The bias_feature was exported from a personal geodatabase in ArcCatalog v10.5 by right-clicking on the geodatabase > Export > Feature class (single). Coordinate System: UTM Zone 18N (WGS84)
Process_Date: 2022
Process_Step:
Process_Description:
Step 11. The bias_feature was split into four regions along the NC coastline as follows: from the Virginia border to Cape Hatteras (NCnorth), from Cape Hatteras to Cape Lookout (NCcentral), from Cape Lookout to Cape Fear (NCsouth), and from Cape Fear to the South Carolina border (NCwest)
Source_Used_Citation_Abbreviation: Bias_Feature
Process_Date: 2022
Source_Produced_Citation_Abbreviation: NCnorth_Bias_Feature
Source_Produced_Citation_Abbreviation: NCcentral_Bias_Feature
Source_Produced_Citation_Abbreviation: NCsouth_Bias_Feature
Source_Produced_Citation_Abbreviation: NCwest_Bias_Feature
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 164
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: -81.0
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: NCnorth_bias_feature
Entity_Type_Definition:
Table containing attribute information associated with the data set.
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. The feature is a polyline shapefile.
Attribute:
Attribute_Label: OBJECTID
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: bias
Attribute_Definition:
This field heading is case-sensitive and name specific. The field contains a proxy-datum bias value describing the unidirectional horizontal offset (in meters) between the MHW elevation of the lidar data and HWL shoreline positions. Values of 0.001 represent areas where no bias was applied. For details on the components that make up the proxy-datum bias, refer to the Methods section of USGS Open-File Report 2010-1118 cross-referenced in the metadata
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 8.463
Range_Domain_Maximum: 13.441
Attribute:
Attribute_Label: bias_uncy
Attribute_Definition:
The field contains the plus/minus horizontal uncertainty (meters) in the lidar shoreline position at each cross-shore beach profile. Values of 0.001 represent areas where no bias was applied. For details on the components that make up this uncertainty, refer to the Methods section of USGS Open-File report 2010-1118 cross-referenced in the metadata.
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.639
Range_Domain_Maximum: 6.974
Attribute:
Attribute_Label: Shape_Leng
Attribute_Definition: Length of feature in meter units (WGS 1984 UTM Zone 18N)
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 19.999
Range_Domain_Maximum: 1160.00
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: USGS ScienceBase
Contact_Address:
Address_Type: mailing and physical
Address: Federal Center, Building 810, MS 302
City: Denver
State_or_Province: CO
Postal_Code: 88025
Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description:
The dataset contains the polyline shapefile of the proxy-datum bias and its uncertainty, (NCnorth_bias_feature.shp and other shapefile components), browse graphic (NCnorth_bias_feature_browse.PNG), 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. 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 polyline 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: 0.14
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
The first link is to the USGS publication page, the second link downloads all the data on the landing page, and the third link is to the dataset landing page.
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20231023
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Marie K. Bartlett
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
Country: US
Contact_Voice_Telephone: 508-548-8700 x 2306
Contact_Electronic_Mail_Address: 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.
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9HYNUNV/NCnorth_bias_feature.html>
Generated by mp version 2.9.51 on Mon Oct 23 17:02:50 2023