Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 20170616 Title: Baseline_OpenOcean.shp - Baseline Along the Open-Ocean (South-Facing) Coast of Dauphin Island, Alabama, Generated to Calculate Shoreline Change Rates. Edition: First. Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Data Release Issue_Identification: doi:10.5066/F7T43RB5 Publication_Information: Publication_Place: St. Petersburg, Florida Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Other_Citation_Details: None. Online_Linkage: https://doi.org/10.5066/F7T43RB5 Description: Abstract: Analysis of shoreline change for Dauphin Island, Alabama was conducted using the U.S. Geological Survey (USGS) Digital Shoreline Analysis System (DSAS) v.4.3 for ArcMap (Thieler and others, 2009) and vector shorelines derived from air photos and lidar elevation surveys. DSAS-generated transects were cast at 100-meter intervals along a user defined shore-parallel baseline. The intersections of transects with the mean high water (MHW) shoreline positions are identified by intercept points. The rate of shoreline change was determined by measuring the differences in the distance to each historical shoreline position from the baseline along each transect. Three analyses of change rates were conducted using a combination of shorelines derived from different data sources. Shoreline change rates from the wet dry line (WDL) shoreline were derived from 10 sets of air photos from 1940 - 2015. Rates of change were also calculated using MHW shorelines extracted from 14 lidar datasets from 1998 - 2014. A final change analysis was conducted using a combination of all WDL (aerial) and MHW (lidar) shorelines, from 1940 - 2015. Purpose: This dataset includes a reference baseline to be used with the DSAS to calculate shoreline change statistics for the back-barrier (north-facing) coast of Dauphin Island, Alabama. This baseline shapefile serves as the starting point for transects cast by the DSAS application. The transects are cast perpendicular to the baseline, and parallel to the general shoreline trend, and intersect each shoreline to establish measurement points, which are used to generate rates of shoreline change. Rates of shoreline change were generated in ArcGIS version 10.0 using the DSAS, version 4.3 (Theiler and other, 2009). Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20170616 Currentness_Reference: Publication date. Status: Progress: Complete Maintenance_and_Update_Frequency: None. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -88.347879 East_Bounding_Coordinate: -88.070565 North_Bounding_Coordinate: 30.222423 South_Bounding_Coordinate: 30.236274 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: oceans and coastal Theme_Keyword: oceans and estuaries Theme_Keyword: Baseline Theme_Keyword: Shoreline Change Theme_Keyword: Digital Shoreline Analysis System Theme_Keyword: DSAS Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: St. Petersburg Coastal and Marine Science Center Theme_Keyword: SPCMSC Theme_Keyword: Open ocean Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: environment Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: coastal processes Theme_Keyword: marine geology Theme_Keyword: geomorphology Theme_Keyword: marine geology Theme_Keyword: geomorphology Theme_Keyword: remote sensing Theme_Keyword: unconsolidated deposits Place: Place_Keyword_Thesaurus: None Place_Keyword: Alabama Place_Keyword: Gulf Coast Place_Keyword: Dauphin Island Place_Keyword: United States Place_Keyword: North America 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 in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida Contact_Person: Rachel E. Henderson Contact_Address: Address_Type: mailing address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727)-502-8000 Contact_Electronic_Mail_Address: rehenderson@usgs.gov Data_Set_Credit: Acknowledgment of the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgment is standard for citation and legal practices. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Native_Data_Set_Environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.0.4.4000 Cross_Reference: Citation_Information: Originator: E.R. Thieler Originator: E.A. Himmelstoss Originator: J.L. Zichichi Originator: A. Ergul Publication_Date: 2009 Title: Digital Shoreline Analysis System (DSAS) version 4.3 - An ArcGIS extension for calculating shoreline change Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Other_Citation_Details: Current version of software at time of use was 4.3 Online_Linkage: https://pubs.er.usgs.gov/publication/ofr20081278 Online_Linkage: https://woodshole.er.usgs.gov/project-pages/DSAS/ Online_Linkage: https://woodshole.er.usgs.gov/project-pages/DSAS/version4/index.html Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The attribute, "ID", in this layer is based on the requirements for use within the Digital Shoreline Analysis System (DSAS) software (USGS Open-File Report 2008-1278). The data have been quality checked. Logical_Consistency_Report: The single polyline has a unique identification attribute (ID) of 1. This field is used by the Digital Shoreline Analysis System (DSAS) to designate the alongshore order of baselines if there are more than one. Completeness_Report: This baseline file is complete and contains one baseline segment used to cast transects along the open ocean (south-facing) coast of Dauphin Island , Alabama where lidar shoreline position data were available and additional shoreline data are present to calculate either a short- or long-term rate of change. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The baseline serves as a reference point for transects cast by the Digital Shoreline Analysis System (DSAS) software. It does not correspond to any real-world feature. Lineage: Process_Step: Process_Description: A feature class was created in a personal geodatabase and was used to construct a baseline offshore from the time series of shoreline positions, using standard editing tools in ArcMap v10.0. The baseline was positioned to conform to changes in the combined alongshore orientation of historical (MHW [lidar] and WDL [aerial]) shorelines. This was done so the transects, which are generated by the Digital Shoreline Analysis System v4.3 from the baseline, would intersect perpendicular to the general trend of the shorelines. The baseline feature was constructed along the open-ocean (south-facing) coast of the island, to capture change to this sandy shoreline. Process_Date: 20160801 Source_Produced_Citation_Abbreviation: Baseline_OpenOcean.shp Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida Contact_Person: Rachel E. Henderson Contact_Address: Address_Type: mailing address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727)-502-8000 Contact_Electronic_Mail_Address: rehenderson@usgs.gov Process_Step: Process_Description: The baseline feature class was exported from a personal geodatabase to a shapefile in ArcCatalog (v.10.0) by performing a right-mouse click on the data layer > export > to shapefile (single). Process_Date: 20170301 Source_Produced_Citation_Abbreviation: Baseline_OpenOcean.shp Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida Contact_Person: Rachel E. Henderson Contact_Address: Address_Type: mailing address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727)-502-8000 Contact_Electronic_Mail_Address: rehenderson@usgs.gov 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: 2 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -87.0 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: Meter Geodetic_Model: Horizontal_Datum_Name: D_North_American_1983 Ellipsoid_Name: GRS_1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Baseline_OpenOcean.shp Entity_Type_Definition: Reference baseline used by the Digital Shoreline Analysis System (DSAS) to calculate rate-of-change statistics. Entity_Type_Definition_Source: 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: Coordinates defining the features. Attribute: Attribute_Label: ID Attribute_Definition: Field required by the Digital Shoreline Analysis System (DSAS) software. DSAS uses this value to determine the ordering sequence of transects when the baseline feature contains multiple segments. Individual segments are numbered sequentially alongshore. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 1 Attribute: Attribute_Label: SHAPE_Leng Attribute_Definition: Length of feature in meters units (UTM zone 19N, WGS 84) Attribute_Definition_Source: Esri Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 34161.85878 Range_Domain_Maximum: 34161.85878 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: Florida Postal_Code: 33701 Country: US Contact_Voice_Telephone: (727)-502-8000 Contact_Electronic_Mail_Address: rehenderson@usgs.gov Resource_Description: Baseline_OpenOcean.shp 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: WinZip Format_Version_Number: 9.0 Format_Specification: Esri polyline shapefile Format_Information_Content: This WinZip file contains the baseline shapefile needed for generating shore-normal transects within the Digital Shoreline Analysis System for Dauphin Island, Alabama. File_Decompression_Technique: Use WinZip or pkUnzip Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-F7T43RB5 /data/Baseline_OpeanOcean.zip Fees: None Technical_Prerequisites: This zip file contains data available in Environmental Systems Research Institute (Esri) polyline shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.Esri.com. Metadata_Reference_Information: Metadata_Date: 20170616 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Rachel Henderson Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: Florida Postal_Code: 33701 Country: US Contact_Voice_Telephone: (727)-502-8000 Contact_Electronic_Mail_Address: rehenderson@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time