These metadata describe the 1979 Submerged Aquatic Vegetation (SAV) coverage dataset that was produced at the Virginia Institute of Marine Science from aerial photography flown in 1979. It is a portion of the full SAV dataset that extends back to 1971.
Identification_Information:
Citation:
Citation_Information:
Originator:
Virginia Institute of Marine Science
Publication_Date:
December 1995
Title: 1979 Chesapeake Bay SAV Coverage
Publication_Information:
Publication_Place: Gloucester Point, Virginia
Publisher: Virginia Institute of Marine Science
Description:
Abstract:
The 1986 Chesapeake Bay SAV Coverage was mapped from 1:24,000
aerial photography to access water quality in the Bay. Each
area of SAV was traced onto 1:24,000 USGS quadrangles. The SAV
beds were then digitized and converted into an Arc/Info GIS
coverage using the procedures documented below.
Purpose:
The annual SAV aerial photographic monitoring program provides
a comprehensive and accurate measure of change in SAV relative
abundance that has been used to link improving water quality to
increases in Bay living resources.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1979
Ending_Date: 1979
Currentness_Reference: Ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.154
East_Bounding_Coordinate: -75.825
North_Bounding_Coordinate: 39.599
South_Bounding_Coordinate: 37.904
Keywords:
Theme:
Theme_Keyword_Thesaurus: None.
Theme_Keyword: vegetative surface cover
Theme_Keyword: SAV
Theme_Keyword: submerged aquatic vegetation
Place:
Place_Keyword_Thesaurus: None
U.S. Department of Commerce, 1977, Countries, dependencies,
areas of special sovereignty, and their principal administrative
divisions (Federal Information Processing Standard 10-3):Washington,
D.C., National Institute of Standards and Technology.
Place_Keyword: US
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the identification
of the States, the District of Columbia and the outlying areas of
The United States, and associated areas
(Federal Information Processing Standard 5-2):Washington ,D. C.,
National Institute of Standards and Technology.
Place_Keyword: 10
Place_Keyword: 24
Place_Keyword: 51
Place_Keyword_Thesaurus: U.S. Postal State Abbreviations
Place_Keyword: VA
Place_Keyword: MD
Place_Keyword: DE
Place_Keyword_Thesaurus: None
Place_Keyword: Chesapeake Bay
Access_Constraints: None
Use_Constraints None.
Point_of_Contact:
Contact_Position: SAV Data Administrator
Contact_Organization: Virginia Institute of Marine Science
Contact_Address: Gloucester Point, Virginia 23062
Contact_Phone: 804/684-7088
Contact_email: savadmin@vims.edu
Data_Set_Credit: SAV Mapping Lab, Virginia Institute of Marine Science
Data_Quality_Information
Attribute_Accuracy:
Logical_Consistency_Report:
The coverage contains full Arc/Info polygon topology. There are no
unlabeled polygons, no intersections, no unattached lines and all lines
have both left and right polygons identified.
Completeness_Report:
The dataset covers only a small set of quadrangles:
Havre de Grace, Md.
Middle River, Md.
Gunpowder Neck, Md.
Swan Point, Md.
Round Bay, Md.
Gibson Island, Md.
Langford Creek, Md.
Centreville, Md.
Kent Island, Md.
Queenstown, Md.
St. Michaels, Md.
Oxford, Md.
Church Creek, Md.
Cambridge, Md.
Nanjemoy, Md.
Mathias Point, Md.- Va.
Barren Island, Md.
Honga, Md.
Terrapin Sand Point, Md.
Marion, Md.
Great Fox Island, Va.- Md.
Crisfield, Md.- Va.
Some of these quadrangles may not have been fully mapped. In
addition, Some small beds, particularly along narrow tributaries
may not have been distinguishable on the aerial photography.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy is based upon the use of USGS
source quadrangles which are compiled to meet National Map
Accuracy Standards (NMAS). The aerial photographs were
manually overlaid on mylar USGS base material during the
photo interpretation process.
Lineage:
Source_Information:
Source_Citation: 1979 SAV 1:24,000 N. Bay Aerial Photography
Source_Scale_Denominator: 24000
Type_of_Source_Media: 9x9 inch negatives
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1979
Ending_Date: 1979
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 1979_PHOTOS
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation: Mylar USGS quadrangles with photointerpreted SAV beds
Source_Scale_Denominator: 24000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1979
Ending_Date: 1979
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 1979_MAPS
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Chesapeake Bay Program Segments adjusted to include land areas
Source_Scale_Denominator: none
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19950614
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: CBPSEGS
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
New Chesapeake Bay Program Segments adjusted to include land areas
Source_Scale_Denominator: none
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19980915
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: CBPSEGS98
Source_Contribution: spatial and attribute information
Process_Step:
Process_Description:
Identification and delineation of SAV beds by
photointerpretation by a U.S. EPA contractor.
Source_Used_Citation_Abbreviation: 1979_PHOTOS, 1979_MAPS
Process_Date: 1980.
Process_Step:
Process_Description:
The perimeters of all SAV beds for Maryland, mapped from the
aerial photography onto the diazo mylar quadrangles, were
digitized by a U.S. EPA contractor.
Source_Used_Citation_Abbreviation: 1979_MAPS
Process_Step:
Process_Description:
Computer Sciences Corporation converted these files into a
separate ARC/INFO format coverage for each quadrangle.
Process_Step:
Process_Description:
Originals were not located. Therefore all map sheets were
plotted by VIMS staff and overlayed on USGS quadrangles to
check for obvious errors.
Process_Date: 19951206.
Process_Step:
Process_Description:
All map sheets were joined into a single file by VIMS staff.
The quadrangle edges were scanned to ensure that the SAV
polygons were consistent on both sides of the border.
Inconsistencies were resolved by checking the diazo maps and
re-interpreting the photography if necessary.
Source_Used_Citation_Abbreviation: 1979_PHOTOS
Process_Date: 19951206.
Process_Step:
Process_Description:
The bay segments were overlayed on the dataset by VIMS staff,
dividing any beds that fell into multiple segments.
Source_Used_Citation_Abbreviation: CBPSEGS
Process_Date: 19950913.
Process_Step:
Process_Description:
The coverage was dissolved on the density item and then
unioned with the new 1998 segment, quadrangle, and state coverages.
Source_Used_Citation_Abbreviation: CBPSEGS98
Process_Date: 19980915.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
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 W
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.875
Ordinate_Resolution: 0.875
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum 1983
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The SAV polygon attributes are used to identify each SAV bed or
portion of an SAV bed, classify it by density and assign into a
geographic or political region.
Detailed_Description:
Entity_Type:
Entity_Type_Label: SAV bed
Entity_Type_Definition: A GT-polygon representing a portion of
an SAV bed or an area completely surrounded by SAV that does
not contain SAV.
Entity_Type_Definition_Source: 1979_MAPS
Attribute:
Attribute_Label: Area
Attribute_Definition: Area of the GT-polygon
Attribute_Definition_Source: Arc/INFO calculation
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 999999999.999
Attribute_Units_of_Measurement: Meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: Perimeter
Attribute_Definition: Perimeter of the GT-polygon
Attribute_Definition_Source: Arc/INFO calculation
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 999999999.999
Attribute_Units_of_Measurement: Meters
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: Beds79#
Attribute_Definition: Internal GT-polygon number
Attribute_Definition_Source: Arc/INFO calculation
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: Beds79-id
Attribute_Definition: User GT-polygon number
Attribute_Definition_Source: Arc/INFO calculation
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: BedID
Attribute_Definition: Two-letter SAV bed identifier. A NULL VALUE IN
THIS FIELD SIGNIFIES A LAND AREA OR ANY OTHER NON-SAV AREA THAT IS
COMPLETELY SURROUNDED BY SAV. THESE POLYGONS SHOULD BE EXCLUDED FROM
SAV AREA COMPUTATIONS.
Attribute_Definition_Source: 1979_MAPS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: AA
Range_Domain_Maximum: ZZ
Attribute:
Attribute_Label: Density
Attribute_Definition: SAV bed density classification
Attribute_Definition_Source: 1979_MAPS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_value: -1
Enumerated_Domain_Definition: Density not determined
Enumerated_Domain_value: 0
Enumerated_Domain_Definition: No SAV
Enumerated_Domain_value: 1
Enumerated_Domain_Definition: 0 - 10% cover (very sparse)
Enumerated_Domain_value: 2
Enumerated_Domain_Definition: 10 - 40% cover (sparse)
Enumerated_Domain_value: 3
Enumerated_Domain_Definition: 40 - 70% cover (moderate)
Enumerated_Domain_value: 4
Enumerated_Domain_Definition: 70 - 100% cover (dense)
Attribute:
Attribute_Label: ContigBed
Attribute_Definition: Two-letter identifier for a larger, multiple-
density bed of which this is a portion.
Attribute_Definition_Source: 1979_MAPS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: AA
Range_Domain_Maximum: ZZ
Attribute:
Attribute_Label: QuadID
Attribute_Definition: Identification number of USGS quads that contains
the SAV bed
Attribute_Definition_Source: 1992 Distribution of SAV in the
Chesapeake Bay, Final Report to U.S. EPA, Chesapeake Bay Program.
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Enumerated_Domain_Definition: Chuckatuck, VA.
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Enumerated_Domain_Definition: Kempsville, VA.
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Enumerated_Domain_Definition: Fowling Creek, MD.
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Enumerated_Domain_Definition: Tingles Island, MD.
Enumerated_Domain_value: 171
Enumerated_Domain_Definition: Girdle Tree, MD.-VA.
Enumerated_Domain_value: 172
Enumerated_Domain_Definition: Boxiron, MD.-VA.
Enumerated_Domain_value: 173
Enumerated_Domain_Definition: Whittington Point, MD.-VA.
Enumerated_Domain_value: 174
Enumerated_Domain_Definition: Chincoteague West, VA.
Enumerated_Domain_value: 175
Enumerated_Domain_Definition: Chincoteague East, VA.
Enumerated_Domain_value: 176
Enumerated_Domain_Definition: Anacostia, D.C.-MD.
Enumerated_Domain_value: 177
Enumerated_Domain_Definition: East of New Point, VA.
Enumerated_Domain_value: 179
Enumerated_Domain_Definition: Goose Island, VA.
Attribute:
Attribute_Label: CBPSEG
Attribute_Definition: Chesapeake Bay Program segment which contains
the SAV bed
Attribute_Definition_Source: CBPSEGS
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Chesapeake Bay Program Segment abbreviations ("CHI"
has been added to identify Chincoteague Bay)
Codeset_Source: Chesapeake Bay Program
Attribute:
Attribute_Label: STATE
Attribute_Definition: U.S. State which contains the SAV bed
(currently blank)
Attribute:
Attribute_Label: County
Attribute_Definition: County which contains the SAV bed
(currently blank)
Attribute:
Attribute_Label: Zone
Attribute_Definition: Bay zone which contains the the SAV bed
Attribute_Definition_Source: CBPSEGS98
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_value: 1
Enumerated_Domain_Definition: CB1TF, NORTF, ELKOH, C&DOH,
BOHOH, SASOH, CB2OH, CB3MH, BSHOH, GUNOH, MIDOH, BACOH,
PATMH, CHSMH, CHSOH, CHSTF, MAGMH (Upper Bay)
Enumerated_Domain_value: 2
Enumerated_Domain_Definition: SEVMH, SOUMH, RHDMH, WSTMH,
EASMH, CB4MH, CHOMH1, CHOMH2, CHOOH, CHOTF, LCHMH, PAXMH,
PAXOH, PAXTF, HNGMH, FSBMH, NANMH, NANOH, NANTF, WICMH,
MANMH, BIGMH, POCMH, POCOH, POCTF, TANMH, POTMH, POTOH,
POTTF, MATTF, PISTF, CB5MH (Middle Bay)
Enumerated_Domain_value: 3
Enumerated_Domain_Definition: RPPMH, CRRMH, RPPOH, RPPTF,
PIAMH, CB6PH, CB7PH, MOBPH, YRKMH, YRKPH, MPNOH, MPNTF,
PMKOH, PMKTF, JMSPH, ELIPH, SBEMH, JMSMH, JMSOH, CHKOH,
JMSTF, APPTF, LYNPH, CB8PH (Lower Bay)
Enumerated_Domain_value: 4
Enumerated_Domain_Definition: CHIPH (Chincoteague Bay)
Attribute:
Attribute_Label: Surveyed
Attribute_Definition: Indicates whether the polygon was covered by the
annual survey.
Enumerated_Domain:
Enumerated_Domain_value: T
Enumerated_Domain_Definition: Included in the area surveyed
Enumerated_Domain_value: F
Enumerated_Domain_Definition: Not included in the area surveyed
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Virginia Institute of Marine Science
Contact_Position: SAV Data Administrator
Contact_Address: Gloucester Point, Virginia 23062
Contact_Phone: 804/684-7088
Contact_Email: savadmin@vims.edu
Resource_Description: 1979 Chesapeake Bay SAV Coverage Shapefile
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SHP
Format_Version_Number: 10.0
Format_Specification: Shapefile
Digital_Transfer_Option:
Offline_Option:
Offline_Media: 3.5" HD Diskette
Recording_Format:
ASCII
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
(pkzip format)
URL https://mobjack.vims.edu/sav/gisdata/beds79.zip
Metadata_Reference_Information:
Metadata_Date: 19990628
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Virginia Institute of Marine Science
Contact_Position: SAV Data Administrator
Contact_Address: Gloucester Point, Virginia 23062
Contact_Phone: 804/684-7088
Contact_Email: savadmin@vims.edu
VIMS SAV Mapping Lab