Metadata: Identification_Information: 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: https://pubs.usgs.gov/ds/0928/downloads/back_island_shorelines.zip 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. Data_Quality_Information: Logical_Consistency_Report: Assateague Island was divided into five sections and data were extracted by sections and later put together. This may have resulted in small gaps between sections. None of the orthoimagery data sets covered the entire island and inconsistencies due to differences in image quality should be expected. No adjustments were made for varying tide levels. The lines were digitized at a scale of approximately 1:2,000. Completeness_Report: Complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The horizontal accuracy of the data is unknown. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: USGS Publication_Date: 2014 Title: USGS DOQQ Orthoimagery Geospatial_Data_Presentation_Form: orthophotography Publication_Information: Publication_Place: http://earthexplorer.usgs.gov/ Publisher: USGS Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19890412 Ending_Date: 19940320 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: USGS Orthoimagery Source_Contribution: This data source was used to hand-digitize back-island shorelines. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Department of Agriculture (USDA) Publication_Date: 2014 Title: USDA NAIP Orthoimagery Geospatial_Data_Presentation_Form: orthophotography Publication_Information: Publication_Place: http://datagateway.nrcs.usda.gov/GDGOrder.aspx Publisher: USDA Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20050608 Ending_Date: 20130905 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: USDA Orthoimagery Source_Contribution: This data source was used to hand-digitize back-island shorelines. Source_Information: Source_Citation: Citation_Information: Originator: Virginia Geographic Information Network (VGIN) Publication_Date: 2013 Title: VGIN Orthoimagery Geospatial_Data_Presentation_Form: orthophotography Publication_Information: Publication_Place: Richmond, VA Publisher: VGIN Type_of_Source_Media: digital hard drive Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20130315 Ending_Date: 20130315 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: VGIN Orthoimagery Source_Contribution: This data source was used to hand-digitize a back-island shoreline. Process_Step: Process_Description: Using ArcMap 10.1 and a scale of approximately 1:2000, shore-normal transects lines spaced 20 m apart were laid over the orthoimages. A line was hand-digitized at the intersections of the apparent back-island shoreline and the transect lines. Only one back-island shoreline/transect line intersection was digitized per transect line. The orthoimagery date was added to the Date_ field in the shapefile attribute table. Source_Used_Citation_Abbreviation: USGS Orthoimagery Source_Used_Citation_Abbreviation: USDA Orthoimagery Source_Used_Citation_Abbreviation: VGIN Orthoimagery Process_Date: 2014 Source_Produced_Citation_Abbreviation: asis_bshrln_1989_2013_transect_guided.shp Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS 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 Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Eastern Time) Contact_Instructions: If unable to reach the contact by telephone, please leave a voice message. Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20201013 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine 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 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@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: 801 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: meter Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: asis_bshrln_1989_2013_transect_guided.shp Entity_Type_Definition: Back-island shorelines hand-digitized at the intersection of 20-m spaced transect lines and the apparent back-island shorelines as seen in orthoimagery. 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: Date_ Attribute_Definition: Date of orthoimage source. Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Date in month, day, year that the image was collected. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Kristy Guy Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, Fla. Contact_Position: GIS/RS Analyst Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Hours_of_Service: Monday-Friday, 9:00-5:00 Eastern Time Resource_Description: DS 928 Distribution_Liability: Although these data were processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product 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: ArcGIS shapefile Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://pubs.usgs.gov/ds/0928/downloads/back_island_shorelines.zip Fees: None if obtained online; otherwise prices vary. Ordering_Instructions: Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, e-mail: infoservices@usgs.gov). Metadata_Reference_Information: Metadata_Date: 20201013 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Contact_Person: Kristy Guy Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South 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) Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None. Metadata_Use_Constraints: None. Metadata_Security_Information: Metadata_Security_Classification_System: None. Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: NONE