Metadata for 1979 Chesapeake Bay SAV Coverage

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.

Table of Contents


Identification Information

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


  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

  Spatial_Data_Organization_Information:

    Direct_Spatial_Reference_Method: Vector

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 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

  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: Beds93#
        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: Beds93-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.
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_value: 1
            Enumerated_Domain_Definition: Conowingo Dam, MD.-PA.
            Enumerated_Domain_value: 2
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            Enumerated_Domain_value: 3
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            Enumerated_Domain_value: 4
            Enumerated_Domain_Definition: North East, MD.
            Enumerated_Domain_value: 5
            Enumerated_Domain_Definition: Elkton, MD.-DEL.
            Enumerated_Domain_value: 6
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            Enumerated_Domain_value: 7
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            Enumerated_Domain_value: 8
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            Enumerated_Domain_value: 9
            Enumerated_Domain_Definition: Spesutie, MD.
            Enumerated_Domain_value: 10
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            Enumerated_Domain_value: 12
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            Enumerated_Domain_value: 13
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            Enumerated_Domain_value: 14
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            Enumerated_Domain_Definition: Bacons Castle, VA.
            Enumerated_Domain_value: 145
            Enumerated_Domain_Definition: Mulberry Island, VA.
            Enumerated_Domain_value: 146
            Enumerated_Domain_Definition: Newport News North, VA.
            Enumerated_Domain_value: 147
            Enumerated_Domain_Definition: Hampton, VA.
            Enumerated_Domain_value: 148
            Enumerated_Domain_Definition: Benns Church, VA.
            Enumerated_Domain_value: 149
            Enumerated_Domain_Definition: Newport News South, VA.
            Enumerated_Domain_value: 150
            Enumerated_Domain_Definition: Norfolk North, VA.
            Enumerated_Domain_value: 151
            Enumerated_Domain_Definition: Little Creek, VA.
            Enumerated_Domain_value: 152
            Enumerated_Domain_Definition: Cape Henry, VA.
            Enumerated_Domain_value: 153
            Enumerated_Domain_Definition: Chuckatuck, VA.
            Enumerated_Domain_value: 154
            Enumerated_Domain_Definition: Bowers Hill, VA.
            Enumerated_Domain_value: 155
            Enumerated_Domain_Definition: Norfolk South, VA.
            Enumerated_Domain_value: 156
            Enumerated_Domain_Definition: Kempsville, VA.
            Enumerated_Domain_value: 157
            Enumerated_Domain_Definition: Princess Anne, VA.
            Enumerated_Domain_value: 158
            Enumerated_Domain_Definition: Wye Mills, MD.
            Enumerated_Domain_value: 159
            Enumerated_Domain_Definition: Bristol, MD.
            Enumerated_Domain_value: 160
            Enumerated_Domain_Definition: Fowling Creek, MD.
            Enumerated_Domain_value: 161
            Enumerated_Domain_Definition: Port Tobacco, MD.
            Enumerated_Domain_value: 162
            Enumerated_Domain_Definition: Charlotte Hall, MD.
            Enumerated_Domain_value: 163
            Enumerated_Domain_Definition: Mardela Springs, MD.
            Enumerated_Domain_value: 164
            Enumerated_Domain_Definition: Wetipquin, MD.
            Enumerated_Domain_value: 165
            Enumerated_Domain_Definition: Selbyville, MD.
            Enumerated_Domain_value: 166
            Enumerated_Domain_Definition: Assawoman Bay, MD.
            Enumerated_Domain_value: 167
            Enumerated_Domain_Definition: Berlin, MD.
            Enumerated_Domain_value: 168
            Enumerated_Domain_Definition: Ocean City, MD.
            Enumerated_Domain_value: 169
            Enumerated_Domain_Definition: Public Landing, MD.
            Enumerated_Domain_value: 170
            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

  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
    Standard_Order_Process:
      Digital_Form:
        Digital_Transfer_Information:
          Format_Name: ARCE
          Format_Version_Number: 7.0.2
          Format_Specification: Coverage
        Digital_Transfer_Option:
          Offline_Option:
            Offline_Media: 3.5" HD Diskette
            Recording_Format:
              ASCII
          Online_Option:
            Computer_Contact_Information:
              Network_Address:
                Network_Resource_Name:
                   (unix tar.Z format)
                   URL ftp://ftp.vims.edu/pub/data/sav/beds79.tar.Z
                   (pkzip format)
                   URL ftp://ftp.vims.edu/pub/data/sav/beds79.zip
    

Metadata Reference Information

  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
Last modified 6/28/99.
Please send us your comments.