Originator: U.S. Geological Survey
Offshore baselines for Assateague Island, Maryland and Virginia (projected, UTM Zone 18 (NAD83))
Geospatial_Data_Presentation_Form: vector digital data
Series_Name: U.S. Geological Survey Data Series
Publication_Place: St. Petersburg, Fla.
Publisher: U.S. Geological Survey
Assessing the physical change to shorelines and wetlands is critical in determining the resiliency of wetland systems that protect adjacent habitat and communities. The wetland and back-barrier shorelines of Assateague Island, located in Maryland and Virginia, changed as a result of wave action and storm surge that occurred during Hurricane Sandy, which made landfall on October 29, 2012. The impact of Hurricane Sandy will be assessed and placed in its historical context to understand the future vulnerability of wetland systems.
Making these assessments will rely on data extracted from current and historical resources such as maps, aerial photographs, satellite imagery, and lidar elevation data, which document physical changes over time.
This USGS Data Series publication includes includes several open-ocean shorelines, back-island shorelines, back-island shoreline points, sand area polygons, and sand lines for Assateague Island that were extracted from orthoimagery (ortho aerial photography)dated from April 12, 1989 to September 5, 2013.
This dataset consists of off-shore reference baselines that approximate the trend of the open-ocean shoreline of Assateague Island, Md. and Va. The baselines were drawn using ArcGIS 10.1 and then used in Digital Shoreline Analysis System (DSAS) software (USGS Open-File Report 2008-1278)to create digital transect lines perpendicular to the baselines and across Assateague Island at 20 meter (m) intervals. The back-island shorelines and shoreline points included in this data series publication are based on the intersect of back-island shorelines and transects lines. These baselines are suitable for use in DSAS or other software packages to produce other transect lines.
Currentness_Reference: publication date
Maintenance_and_Update_Frequency: None planned
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: unconsolidated deposits
Theme_Keyword: field inventory and monitoring
Theme_Keyword: coastal processes
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: OCEAN > COASTAL PROCESSES > BARRIER ISLANDS
Theme_Keyword: COASTAL PROCESSES > BEACHES
DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF INTERIOR
Place_Keyword_Thesaurus: Geogrphic Names Information System
Place_Keyword: Assateague Island
Place_Keyword: United States
Place_Keyword: National Seashore
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Coastal and Marine Geology Program as the originator of these data in future products or derivative research.
Contact_Organization: U.S. Geological Survey
Contact_Person: Kristy Guy
Address_Type: mailing and physical
Hours_of_Service: Monday through Friday 9:00 AM to 5:00 PM (Eastern Time)
Address: 600 4th St. S.
City: St. Petersburg
Acknowledgment of the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Coastal and Marine Geology Program as a data source would be appreciated in products developed from these data, and such acknowledgment as 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. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552.