Rehoboth Bay, Delaware Shoreline Structures

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Title: Rehoboth Bay, Delaware Shoreline Structures
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Gloucester Point, Virginia
Publisher: Virgina Institute of Marine Science (VIMS)
Online_Linkage:
<http://ccrm.vims.edu/gis_data_maps/shoreline_inventories/index.html>
Description:
Abstract:
Shoreline Situation Reports (SSR) were first generated by VIMS in the 1970's to report the condition and status of the shore lands. The SSR series were published in hardcopy on a county by county basis for each of the Tidewater Virginia localities. The reports were intended to assist planners, managers, and regulators in decisions pertaining to management of coastal areas and natural resources therein. This is the first Shoreline Inventory Report for the Rehoboth Bay section of Delaware. Data collected describes conditions in the immediate riparian zone, the bank, and along the shore.
Purpose: To inventory Rehoboth Bays tidal shoreline conditions.
Supplemental_Information:
There are three shapefiles that are part of the 2012 Rehoboth Bay, Delaware Shoreline Inventory database: Rehoboth_lubc, Rehoboth_sstru, and Rehoboth_astru. Rehoboth_lubc (land use and bank cover for Rehoboth Bay) is a linear shapefile containing data about land use, tree fringe, canopy overhang, bank height, bank cover, erosion, presence of Phragmites australis, marsh and beach status along the shoreline. Rehoboth_sstru (Rehoboth Bay shoreline structures) is a linear shapefile delineating hard structures in place at the shoreline (bulkhead, dilapidated bulkhead, riprap, wharf, unconventional, debris, marina < 50 slips, marina > 50 slips, jetty, marsh toe revetment, groinfield and breakwaters). Rehoboth_astru (Rehoboth Bay access structures) is a point shapefile with locations of docks, dilapidated docks, boathouses, and private and public boat ramps.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 10/15/2012
Single_Date/Time:
Calendar_Date: 10/16/2012
Single_Date/Time:
Calendar_Date: 10/17/2012
Single_Date/Time:
Calendar_Date: 10/18/2012
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.188750
East_Bounding_Coordinate: -75.065596
North_Bounding_Coordinate: 38.776525
South_Bounding_Coordinate: 38.612066
Keywords:
Theme:
Theme_Keyword: Shoreline Inventory
Theme_Keyword: Shoreline structures
Theme_Keyword: Access structures
Theme_Keyword: Land use
Theme_Keyword: Bank cover
Place:
Place_Keyword: Rehobeth Bay
Place_Keyword: Rehobeth Canal
Place_Keyword: Lewes Canal
Place_Keyword: Love Creek
Place_Keyword: Herring Creek
Place_Keyword: Delaware
Access_Constraints: none
Use_Constraints:
These data should not be used for jurisdictional permit determinations beyond providing general shoreline condition or status information. These data have not been surveyed to property boundaries.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Marcia Berman
Contact_Organization: Virginia Institute of Marine Science (VIMS)
Contact_Position: Director Comprehensive Coastal Inventory Program
Contact_Address:
Address_Type: mailing and physical address
Address: P.O. Box 1346 Greate Road
City: Gloucester Point
State_or_Province: Virginia
Postal_Code: 23062
Country: USA
Contact_Voice_Telephone: 804-684-7188
Contact_Facsimile_Telephone: 804-684-7179
Contact_Electronic_Mail_Address: marcia@vims.edu
Native_Data_Set_Environment:
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.3500
Data_Quality_Information:
Completeness_Report:
This inventory targets tidal shoreline only. Access by boat is required for field surveys. Remote sensing techniques are used in areas where water depths are too shallow for access or where unmanaged, undeveloped shoreline persists along very long reaches. This would include headwaters of tidal creeks, and natural areas along park and conservation lands.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Shoreline attributes recorded with a GPS unit as the boat moves along the shoreline has a horizontal accuracy of +/- 5 meters. Data was transferred from the GPS boat track to an existing digital shoreline coverage by projecting data to the shoreline at a 90 degree angle from the boat track. Rectified imagery were used as a background coverage to aid in data positioning. Land use features were placed along the shore so changes in land use were coincident with changes illustrated in the imagery. Positional accuracy for data that has been corrected with imagery which has a resolution of 2 meters or better. Accuracy limits of the field collected data, however, are set at 5 meters due to the short occupancy of GPS units. In many cases the image correction yields a final positional accuracy much closer to 2 meters or less, depending on image resolution.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Virginia Geographic Information Network (VGIN)
Title: Virginia Base Mapping Program (VBMP)
Process_Step:
Process_Description:
Wherever possible, all field surveys are performed from a small shoal draft vessel navigating at slow speeds parallel to the shoreline. To the extent possible, surveys take place on a rising tide allowing the boat to be as close to the shore as possible. The field crew consists of a boat operator and one data collector.
Process_Step:
Process_Description:
Data is logged using a geo-referenced video camera. The Red Hen System provides hardware and software to collect geo-referenced video and photo data in the field. A standard video camera (sony ACC-HDV7) is interfaced with a GPS antennae via the Red Hen hardware device - VMS 300. VMS 300 converts GPS data into audio signals, which are sent to a video camera through its microphone input connector. As the video is recorded, GPS data are transmitted once per second to the video camera by VMS 300. Each GPS location is linked with a time code on the video. Therefore, the survey is a set of videos containing geographically referenced shoreline data.
Process_Step:
Process_Description:
For tributaries surveyed in the field using GPS referenced videography, the proprietary software associated with the Red Hen System is used for post processing: Pixpoint and GeoVideo for GIS. The PixPoint software package is used to generate a point shapefile containing points representing locations of geo-referenced still photos taken during the survey. GeoVideo software package is an ArcGIS extension. It is a desktop mapping application that brings the geo-referenced video directly into the ArcGIS environment. This software enables users to digitally map videos using GPS coordinates. After the videos are downloaded to the computer, the GeoVideo software is used to generate a point shapefile which is geotagged to the precise track of the video survey. This shapefile is a representation of the survey track. Along with the video link, it enables GIS personnel to code the shoreline conditions in ArcMap based on what is viewed in the video.
Process_Step:
Process_Description:
Areas that are coded remotely used the most current imagery available as background.
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sharon Killeen
Contact_Organization:
Comprehensive Coastal Inventory Program, Viginia Institute of Marine Science (VIMS)
Contact_Position: GIS Programmer/Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: P.O. Box 1346 Greate Road
City: Gloucester Point
State_or_Province: Virginia
Postal_Code: 23062
Country: USA
Contact_Voice_Telephone: 804-684-7534
Contact_Facsimile_Telephone: 804-684-7179
Contact_Electronic_Mail_Address: sharon@vims.edu
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: 919
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: 0.000000
Ordinate_Resolution: 0.000000
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
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Resolution: 0.000100
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Rehoboth_sstru
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: Shape_Leng
Attribute:
Attribute_Label: Structure
Attribute_Definition:
Groinfield, marina less than or greater than 50 slips, jetty, breakwater, debris, unconventional, bulkhead, dilapidated bulkhead, marsh toe revetment, riprap, and wharf
Attribute:
Attribute_Label: Remote
Attribute_Definition:
not field checked but coded using available imagery sources in the lab
Attribute:
Attribute_Label: Field_day
Attribute_Definition: date of data collection
Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.639
Metadata_Reference_Information:
Metadata_Date: 20130408
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sharon Killeen
Contact_Organization: Virginia Institute of Marine Science (VIMS)
Contact_Position: GIS Programmer/Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: P.O. Box 1346 Greate Road
City: Gloucester Point
State_or_Province: Virginia
Postal_Code: 23062
Country: USA
Contact_Voice_Telephone: 804-684-7534
Contact_Facsimile_Telephone: 804-684-7179
Contact_Electronic_Mail_Address: sharon@vims.edu
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.6 on Mon Apr 08 15:40:18 2013