GPS Shorelines of Assateague Island National Seashore, Dec. 1994 - Dec. 2006

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: ASIS Cartographic Technician
Publication_Date: 200701
Title:
GPS Shorelines of Assateague Island National Seashore, Dec. 1994 - Dec. 2006
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: http://science.nature.nps.gov/nrdata
Description:
Abstract:
These data represent a series of mean high water shorelines collected on Assateague Island National Seashore (ASIS), appended into one shapefile. The shoreline surveys are collected using an Trimble ProXR GPS mounted on an ATV, and range in dates from December of 1994 to the most recent updated survey of December, 2006. Depending on the time of year and intended purpose, some surveys contain ocean, inlet and bay shorelines, while some surveys only contain ocean shorelines. Additionally, some surveys contain all of ASIS, while some contain only shorelines in the Maryland district.
Purpose:
The dynamic nature of coastal barriers such as Assateague Island is a defining characteristic, influencing nearly every aspect of their ecology. Fundamentally disturbance driven systems, barrier islands and their endemic biota are continually shaped by physical forces on a time scale vastly accelerated in comparison to mainland systems. Because of the rapid pace and scope of change, long term monitoring is crucial towards understanding natural barrier island conditions as well as anthropogenic influences. This appended shoreline dataset was created to aid in data use and distribution. Shorelines are also stored and available as individual line shapefiles, which are available through contacting ASIS (asis_gis@nps.gov).
Supplemental_Information:
These shorelines are also stored as individual line shapefiles, which contain more detailed positional information and specific time and date attributes. These data can be available through contacting ASIS (asis_gis@nps.gov).
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 199412
Ending_Date: 200612
Currentness_Reference:
ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Quarterly
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.415360
East_Bounding_Coordinate: -75.091404
North_Bounding_Coordinate: 38.325713
South_Bounding_Coordinate: 37.851768
Keywords:
Theme:
Theme_Keyword_Thesaurus: Assateague Island National Seashore Keyword Thesaurus
Theme_Keyword: Geomorphology
Theme_Keyword: Beaches
Theme_Keyword: Beach Dynamics
Theme_Keyword: Coastal Dynamics
Theme_Keyword: Erosion
Theme_Keyword: Shoreline
Theme_Keyword: Shoreline Change
Theme_Keyword: Storms
Theme:
Theme_Keyword_Thesaurus: National Park Service Theme Category Thesaurus
Theme_Keyword: Geology
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Place:
Place_Keyword_Thesaurus: USPS Abbreviations
Place_Keyword: Assateague Island National Seashore
Place_Keyword: Northeast Region
Place_Keyword: Sinepuxent District
Place_Keyword: Tom's Cove District
Place_Keyword: Maryland
Place_Keyword: Virginia
Place_Keyword: MD
Place_Keyword: VA
Place:
Place_Keyword_Thesaurus: National Park System Unit Name Thesaurus
Place_Keyword: Assateague Island National Seashore
Place:
Place_Keyword_Thesaurus: National Park System Unit Code Thesaurus
Place_Keyword: ASIS
Access_Constraints: None
Use_Constraints:
None
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: MD
Postal_Code: 21811
Country: USA
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: Mon thru Fri 0900 - 1600
Data_Set_Credit:
ASIS
Security_Information:
Security_Classification_System: none
Security_Classification: Unclassified
Security_Handling_Description: none
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535
Cross_Reference:
Citation_Information:
Originator: GIS Specialist, ASIS
Publication_Date: 200701
Title:
Metadata for GPS Shorelines of Assateague Island National Seashore, Dec. 1994 - Dec. 2006
Online_Linkage: http://nrdata.nps.gov/ASIS/ASISdata/asis_shorelines.xml
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attributes are accurate as recorded by the Trimble ProXR GPS and TSC1 handheld data-logger.
Logical_Consistency_Report:
Most of the data in this file were checked at 1:2000 for topological inconsistency in the line, and all inconsistent topology was amended.  Some gaps are present and have not been amended.  Multiple data points were deleted.
Completeness_Report:
This dataset includes surveys that cover the following extents: the entire ocean shoreline of Assateague Island; the ocean shoreline within the Maryland portion of Assateague Island; the ocean shoreline of the northern most 10 kilometers of Assateague Island; the northern 10 kilometers of the bayside shoreline of Assateague Island; and the southern most 6-8 km of bay shoreline, in the Virginia portion of Assateague Island.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal precision was reported as sub-meter.  All positions were post-processed and points where 68% precisions exceeded 1 meter were not exported.  Positions with a PDOP of 6.0 or greater were not exported.  60 of 14645 positions were filtered out because PDOP was over 6.0.  Positions were collected at known reference points during each survey.  These positions were compared with the published coordinates of the reference points and did not vary more than 1 meter horizontal distance from the published location.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 1m
Horizontal_Positional_Accuracy_Explanation:
see report
Lineage:
Process_Step:
Process_Description:
Surveys along the ocean shoreline were accomplished by driving a 4 wheel ATV at a relatively constant speed along the identified high tide line. For the purposes of this monitoring program, the actual ocean "shoreline" was defined as the average position of the most recent high tide, evidenced by the obvious wet/dry sand line or deposited wrack.  The GPS receiver was configured to record positions at a very short interval (1 position every 1 seconds) for the best representation of the shoreline position.  This survey (Ocean and Bayside) was conducted shortly after the daily high tide at the Lewes Delaware Water Level Station (8557380). (20061116: 4.58 ft at 00530; 20061117: 4.40 at 0542; 20061120: 5.13 at 0806; 20061121: 5.28 at 0836)  Mean normal high tide at Lewes Delaware is 4.08 feet.  

Logical consistency was checked in ArcMap v 9.1.  The antenna was mounted on the left side of the ATV above the front left wheel.  

The Maryland bay shoreline was collected by walking along the water line from the inlet to km4.25 after high tide on 20061120 and from  km 4.25 to km 8.5 on 20061121.

The Virginia Toms Cove bay shoreline was collected by walking along the water line from the old Coast Guard Station to the beginning of marsh near the Toms Cove Visitors Center.

All data was real-time differentially corrected using beacon signals from Annapolis, MD or Driver, VA.  Data was also differentially post-processed using data from the VIMS (Wachapreague, VA) and Horn Point, MD CORS stations.
Process_Date: 20061206
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: MD
Postal_Code: 21811
Country: USA
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Hours_of_Service: Mon thru Fri 0900 - 1600
Process_Step:
Process_Description:
After data collection, each survey is manipulated in ArcGIS so it can be appended into this master database of ASIS GPS shorelines (asis_shorelines.shp).  Line features are split between shoreline types  (Bay, Inlet, Mudflat, Ocean, etc.) so that no features contain more than on type of shoreline.  The features with the same shoreline type are then merged together, resulting in one unique feature for each type of shoreline, per survey.  These features now represent multiple GPS events and dates, so the GPS specific fields are deleted from the survey attribute table, and the following fields are added and filled in:  Type (shoreline type), Year, Month, Day, Season (all of which represent the final date of shoreline collection for the associated feature), and Comments.  The survey is then simply appended to the master dataset using the 'Append' tool in ArcToolbox.
Process_Date: 200701
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Organization: Assateague Island National Seashore, Resource Management GIS
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: MD
Postal_Code: 21811
Country: USA
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: Mon - Fri; 9:00am - 4:00pm
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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: 103
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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: 0.999600
Longitude_of_Central_Meridian: -75.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000128
Ordinate_Resolution: 0.000128
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: asis_shorelines
Entity_Type_Definition:
attribute table for the shapefile containing all ASIS shoreline surveys
Entity_Type_Definition_Source:
ASIS
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: TYPE
Attribute_Definition:
Type of water body providing prevailing processes on the stretch of shoreline.
Attribute_Definition_Source:
ASIS Resource Management
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Bay
Enumerated_Domain_Value_Definition:
Shoreline borders a bay.
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Enumerated_Domain:
Enumerated_Domain_Value: Ocean
Enumerated_Domain_Value_Definition:
Shoreline borders an ocean.
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Enumerated_Domain:
Enumerated_Domain_Value: Inlet
Enumerated_Domain_Value_Definition:
Shoreline borders an inlet.
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Enumerated_Domain:
Enumerated_Domain_Value: Mudflat
Enumerated_Domain_Value_Definition:
Shoreline borders a mudflat.
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Attribute:
Attribute_Label: YEAR
Attribute_Definition:
Year of data collection
Attribute_Definition_Source:
ASIS Resource Management
Attribute_Domain_Values:
Unrepresentable_Domain:
Calendar year during which data collection occurred
Attribute:
Attribute_Label: MONTH
Attribute_Definition:
Month of the year during which data collection occurred
Attribute_Definition_Source:
ASIS Resource Management
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition:
January
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition:
February
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition:
March
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
April
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition:
May
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition:
June
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition:
July
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition:
August
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 9
Enumerated_Domain_Value_Definition:
September
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition:
October
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition:
November
Enumerated_Domain_Value_Definition_Source:
Calendar
Enumerated_Domain:
Enumerated_Domain_Value: 12
Enumerated_Domain_Value_Definition:
December
Enumerated_Domain_Value_Definition_Source:
Calendar
Attribute:
Attribute_Label: DAY
Attribute_Definition:
One of the numbered 24-hour periods into which a week, month, or year is divided.
Attribute_Definition_Source:
The American Heritage Dictionary
Attribute_Domain_Values:
Unrepresentable_Domain:
The values for this field represent the day of the month on which data were collected.
Attribute:
Attribute_Label: SEASON
Attribute_Definition:
Season of data collection.
Attribute_Definition_Source:
ASIS Resource Management
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Winter
Enumerated_Domain_Value_Definition:
Months of December, January, and February.
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Enumerated_Domain:
Enumerated_Domain_Value: Spring
Enumerated_Domain_Value_Definition:
Months of March, April, and May
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Enumerated_Domain:
Enumerated_Domain_Value: Summer
Enumerated_Domain_Value_Definition:
Months of June, July, and August
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Enumerated_Domain:
Enumerated_Domain_Value: Fall
Enumerated_Domain_Value_Definition:
Months of September, October, and November
Enumerated_Domain_Value_Definition_Source:
ASIS Resource Management
Attribute:
Attribute_Label: COMMENTS
Attribute_Definition:
comments recorded during data collection and/or data processing
Attribute_Definition_Source:
ASIS Resource Management
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: MD
Postal_Code: 21811
Country: USA
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: Mon thru Fri 0900 - 1600
Resource_Description: The mean high-tide ocean-side shoreline from the Ocean City Inlet in Maryland to the Hook at the southern terminus of Assateague Island in Virginia and the bayside shoreline from the Ocean City Inlet in Maryland to km 8.5 on the North End and the bayside shoreline of Toms Cove in Virginia.
Distribution_Liability:
The National Park Service shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics (i.e. "GIF or JPG" format files) are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they are derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data; it is not appropriate to use the related graphics as data. The National Park Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from an NPS server and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on computer systems at the National Park Service, no warranty expressed or implied is made regarding the utility of the data on other systems for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SHP
Format_Version_Number: ArcGIS 9.1
Transfer_Size: 0.191
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://nrdata.nps.gov/ASIS/ASISdata/asis_shorelines.zip
Fees: none
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200701
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Metadata_Reference_Information:
Metadata_Date: 20070320
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: MD
Postal_Code: 21811
Country: USA
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: Mon thru Fri 0900 - 1600
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: none
Metadata_Use_Constraints:
none
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: http://nrdata.nps.gov/profiles/nps_profile.xml
Profile_Name: NPS Metadata Profile
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
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