Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2015
Title:
Assateague Island Back-Island Shorelines Extracted from orthoimagery, 1989 - 2013
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: U.S. Geological Survey Data Series
Issue_Identification: 928
Publication_Information:
Publication_Place: St. Petersburg, Fla.
Publisher: U.S. Geological Survey
Online_Linkage:
Description:
Abstract:
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 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 (orthoaerial photography) dated from April 12, 1989 to September 5, 2013.
This data set consists of lines that were digitized at the intersection of the back-island shoreline and a set of transects spaced at 20-meter (m) intervals. The transects, asis_transects_ln_20m_utm18.shp, are included in this Data Series publication and can be accessed via the Data Download page. The lines falling between the transects do not follow the natural back-island shoreline. Only one back-island shoreline/transect intersection line vector was digitized per transect.
Orthoimagery of Assateague Island were acquired in digital format from U.S. Department of Agriculture (USDA), U.S. Geological Survey (USGS) and Virginia Geographic Information Network (VGIN) courtesy of the Commonwealth of Virginia.
The following list provides additional details about the orthoimagery used. The digitized back-island shorelines for all dates have been compiled into one data set (shapefile) named asis_bshrln_1989_2013_guided.shp. The orthoimage date for each line is included in the shapefile attribute table Date_ field.
Date State Type Source Resolution
198904129(1) MD DOQQ USGS 1 meter (m)
19940320 VA DOQQ USGS 1 m
20041105 VA NAIP USDA 2 m
20050608 VA NAIP USDA 2 m
20050615 MD NAIP USDA 1 m
20060528 VA NAIP USDA 2 m
20060701 MD NAIP USDA 2 m
20070622 MD NAIP USDA 1 m
20080525 VA NAIP USDA 1 m
20090626 MD NAIP USDA 1 m
20090726 VA NAIP USDA 1 m
20090807 VA NAIP USDA 1 m
20110530 VA NAIP USDA 1 m
20110602 MD NAIP USDA 1 m
20120512 VA NAIP USDA 1 m
20130315 VA VBMP VGIN(2) 1 m(3)
20130905 MD NAIP USDA 1 m
DOQQ Digital Orthophoto Quarter Quads
NAIP National Agriculture Imagery Program
VBMP Virginia Base Mapping Program
(1)Color Infrared orthoimagery; all others are natural color.
(2)Imagery courtesy of the Commonwealth of Virginia.
(3)Resampled from 1-foot resolution imagery.
Purpose:
These data were extracted from orthoimagery to document the changes in Assateague Island's back-island shoreline due to Hurricane Sandy and over time since 1989.
These data will aid in developing an assessment of the physical change in wetlands due to wave action and storm surge from Hurricane Sandy and in determining the resiliency of wetland systems that protect adjacent habitat and communities.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19890412
Ending_Date: 20130905
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.407358
East_Bounding_Coordinate: -75.096357
North_Bounding_Coordinate: 38.325681
South_Bounding_Coordinate: 37.865184
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:044685e3-64ec-4816-b239-a643bf14b070
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: aerial photography
Theme_Keyword: remote sensing
Theme_Keyword: orthoimagery
Theme_Keyword: orthophotography
Theme_Keyword: shoreline
Theme_Keyword: wetlands
Theme_Keyword: erosion
Theme:
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: LAND SURFACE > LAND USE/LAND COVER > LAND COVER
Theme_Keyword: OCEAN > COASTAL PROCESSES > BARRIER ISLANDS
Theme_Keyword: COASTAL PROCESSES > BEACHES
Theme_Keyword:
DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF INTERIOR
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Assateague Island
Place_Keyword: Maryland
Place_Keyword: Virginia
Place_Keyword: United States
Place_Keyword: National Seashore
Place_Keyword: Worcester
Place_Keyword: Accomack
Temporal:
Temporal_Keyword_Thesaurus: General
Temporal_Keyword: 1989
Temporal_Keyword: 1994
Temporal_Keyword: 2004
Temporal_Keyword: 2005
Temporal_Keyword: 2006
Temporal_Keyword: 2007
Temporal_Keyword: 2008
Temporal_Keyword: 2009
Temporal_Keyword: 2011
Temporal_Keyword: 2012
Temporal_Keyword: 2013
Access_Constraints: None.
Use_Constraints:
Variability in the quality of the imagery from one date to another, from one image to another taken on the same date, and from one part of an image to another part of the same image, exists due to many factors including variation in sun angle, atmospheric conditions, season, reflectivity of the earth surface, camera angle, camera lens, camera settings, film sensitivity, water turbidity, water depth, tide level, waves, and error in image rectification. No adjustments were made to account for tide level.
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Kristy Guy
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th St. S.
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727-502-8000
Contact_Facsimile_Telephone: 727-502-8181
Contact_Electronic_Mail_Address: kguy@usgs.gov
Hours_of_Service: Monday through Friday 9:00 AM to 5:00 PM (Eastern Time)
Data_Set_Credit:
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.
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552.
