Metadata for 1978 Chesapeake Bay SAV Coverage

These metadata describe the 1978 Submerged Aquatic Vegetation (SAV) coverage dataset that was produced at the Virginia Institute of Marine Science from aerial photography flown in 1978. 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: 1978 Chesapeake Bay SAV Coverage
        Publication_Information:
          Publication_Place: Gloucester Point, Virginia
          Publisher: Virginia Institute of Marine Science
    Description:
      Abstract:
	The 1978 Chesapeake Bay SAV Coverage was mapped from 1:24,000
	black and white aerial photography to access water quality in
	the Bay.  Each area of SAV was traced onto 1:24,000 USGS
	quadrangles and (for the Southern Bay) classified into one of
	four density classes by the percentage of cover.  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: 19780611
          Ending_Date: 197810
      Currentness_Reference: Ground condition
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: Irregular
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -77.417
        East_Bounding_Coordinate: -74.875
        North_Bounding_Coordinate: 39.708
        South_Bounding_Coordinate: 36.625
    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:
      Attribute_Accuracy_Report:
	The density attribute for the Southern Bay has been checked by
	comparison with the source material.
    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 contains all SAV areas that were identified from the
      areas flown.  Some areas that are presumed to contain no SAV were
      not flown.  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: 1978 SAV 1:24,000 N. Bay Aerial Photography
        Source_Scale_Denominator: 24000
        Type_of_Source_Media: 9x9 inch black & white negatives
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 19780611
              Ending_Date: 197810
          Source_Currentness_Reference: ground condition
        Source_Citation_Abbreviation: 1978_PHOTOS_N
        Source_Contribution: spatial and attribute information
      Source_Information:
        Source_Citation: 1978 SAV 1:24,000 S. Bay Aerial Photography
        Source_Scale_Denominator: 24000
        Type_of_Source_Media: 9x9 inch color negatives
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 19780607
              Ending_Date: 19780706
          Source_Currentness_Reference: ground condition
        Source_Citation_Abbreviation: 1978_PHOTOS_S
        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: 19780607
              Ending_Date: 197810
          Source_Currentness_Reference: ground condition
        Source_Citation_Abbreviation: 1978_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 VIMS staff and American University
	  utilized all available information including: knowledge of
	  aquatic grass signatures on film, distribution of SAV in 1978
	  from aerial photography, 1978 ground survey information,
	  aerial site surveys, and low-level aerial inspection for the
	  Northen Bay.  USGS 7.5 minute quadrangle maps (1:24,000
	  scale) printed by the Mid-Continent Mapping Center of the
	  National Cartigraphic Information Center on stable
	  transparent mylar were used as base maps (1:12,000 scale maps
	  were produced and used as a base for the Potomac).  SAV beds
	  from the 1986 aerial photographs were then mapped onto these
	  diazo mylar copies of USGS 7.5 minute quadrangles.
	  Delineation of each SAV bed was facilitated by superimposing
	  the photographic print with the appropriate diazo mylar
	  quadrangle on a light table. SAV bed boundaries were then
	  traced directly onto the diazo mylar quadrangle with a
	  pencil. Where minor scale differences were evident between a
	  photograph and a quadrangle, or where significant shoreline
	  erosion or accretion had occurred since USGS publication of a
	  map, either a best fit was obtained or shoreline changes were
	  noted on the quadrangle.
	  In addition to delineating SAV bed boundaries for the
	  Southern Bay, an estimate of SAV density within each bed was
	  made by visually comparing each bed to an enlarged Crown
	  Density Scale similar to those developed for estimating
	  forest tree crown cover from aerial photography. Bed density
	  was categorized into one of four classes based on a
	  subjective comparison with the density scale. These were: 1,
	  very sparse (<10% coverage); 2, sparse (10-40%); 3, moderate
	  (40-70%); or 4, dense (70-100%). Either the entire bed or
	  subsections within the bed were assigned a bed density number
	  (1 to 4) corresponding to the above density classes.  Some
	  beds were subsectioned to delineate where variation in SAV
	  density ocurred. Additionally, each distinct SAV unit (bed or
	  bed subsection) was assigned an identifying two letter
	  designation unique to its map.  Subsections were futher
	  identified as contiguous beds by the addition of two letters
	  unique to that sequence.  These contiguous bed
	  identifications aid the tracking and analysis of single
	  natural bed units that were subsectioned due to variation in
	  SAV density. Coupled with the appropriate SAV map number and
	  year of photography, these two letter designations uniquely
	  identify each SAV bed in the data base.  In order to reduce
	  interobserver variability in th mapping processes, steps were
	  taken to ensure quality assurance.  Sections from several
	  areas in both Maryland and Virginia containing SAV were
	  independently mapped and assigned a density classification.
	  Results were compared for compatibility of the mapping
	  efforts.
        Source_Used_Citation_Abbreviation: 1978_PHOTOS_N, 1978_PHOTOS_S,
                                           1978_MAPS
        Process_Date: 1979.
      Process_Step:
        Process_Description:
	  The perimeters of all SAV beds for Virginia, mapped from the
	  aerial photography onto the diazo mylar quadrangles, were
	  digitized by VIMS staff in a clockwise direction using a
	  NUMONICS Model 2400/2200 DigiTablet Graphics Analysis System
	  with a resolution of 0.001 inches (0.00254 cm) and an
	  accuracy of 0.005 inches (0.0127 cm). All coordinates were
	  transmitted to a PRIME 9955 computer for data management and
	  analysis via software developed at VIMS.  The perimeter of
	  each SAV bed was defined by a polygon with a linear data
	  point density of 127 per chart inch (50 per cm, 5 meter
	  ground resolution).  The total number of points defining any
	  SAV bed is dependent on overall bed size. The SAV bed
	  perimeter was stored as X and Y coordinates in centimeters
	  from the quadrangle origin (lower left corner).  Any "island"
	  within a polygon (digitized SAV perimeter_ was disregarded as
	  long as a line was drawn from the outside of the polygon to
	  the "island" and the resulting polygon was digitized in a
	  clockwise direction.  THe line connecting the "island"
	  polygon to the larger surrounding polygon was drawn in by the
	  digitizer operator.  Prior and subsequent to each
	  digitization session, the NUMONICS instrument was checked
	  manually against a digitizing standard. This was accomplished
	  by securing a diazo mylar quadrangle to the digitizing
	  tablet. Then the mylar standard was secured to the same
	  quadrangle and digitized four times.  The information from
	  digitizing the standard was transmitted to the beginning of
	  the SAV bed perimeter file on the computer. The same
	  procedure was followed at the end of each digitizing session.
	  When this file was processed by the computer, the digitized
	  area of each standard was compared to the known area of the
	  standard. If a variation between the known and the mean of
	  the observed areas exceeded 1.0%, a warning was printed
	  advising the operator to check the digitizing system. In
	  addition, checks were made with respect to the absolute
	  location of the digitizing standard as secured to the map. A
	  comparison was made between the location of the standard
	  before and after the digitizing session. If the absolute
	  location differed by more than 0.10 cm another warning was
	  printed.  Any movement in absolute location can be indicative
	  of digitizer instrument drift or chart movement during the
	  digitization session.  These checks assure that the final
	  calculated bed locations are as accurate as possible.
	  Maximum accuracy was maintained by exclusively using mylar
	  quadrangles and standards rather that paper ones which can
	  change scale as a function of changes in air temperature and
	  humidity in the digitizer room.  A complete outline of the
	  digitization procedure can be found in Orth et al., "Quality
	  assurance project plan for the 1987 submerged aquatic
	  vegetation distribution and abundance survey of the
	  Chesapeake and Chincoteague Bays." Plan submited to U.S. EPA,
	  Cheapeake Bay Liason Office, Annapolis, MD.  Standard
	  operating procedures (SOPs) were developed to facilitate
	  orderly and efficient processing of the 1978 SAV maps and the
	  SAV bed perimeter computer files produced from them, and to
	  comply with the need for consistency, quality assurance, and
	  quality control. SOPs developed include: a detailed procedure
	  outlining 46 steps for digitization of SAV maps; a 47 step
	  checklist for editing SAV perimeter computer files to insure
	  completeness and accuracy; a digitizer log in which all
	  operations were recorded and dated, which was used to guide
	  and record editing operations; and a flow chart used to track
	  progress of all operations including changes in file names.
	  Part of the quality assurance/quality control program was
	  designed to isolate and remove anomolous data and to obtain
	  accurate and representative SAV bed polygons. Every SAV bed
	  mean area was the result of at least four independent
	  digitizations of the perimeter of each SAV bed. The computer
	  calculated area for each replication, and the three bed
	  perimeters most similar in terms of area were then used for
	  the calculation of a mean area. The three replicate areas
	  used in the mean area calcuation were required to be within
	  5% or less from than of the mean bed area. All replicates
	  whose areal differences were in excess of 5% of the mean bed
	  area were flagged by the VIMS quality assurance/quality
	  control computer program for additional error assesment. The
	  VIMS error rate was normally less that 1%. The replicate bed
	  perimeter whose area was most similar to the mean area was
	  identified as the "best bed" and chosen as representative of
	  that SAV bed.
	  The "best bed" perimeter coordinate points were then
	  converted by VIMS to latitude and longitude and a copy of
	  each on computer tape in MOSS format was then sent to the EPA
	  Chesapeake Bay Program Computer Center for incorporation into
	  the ARC/INFO GIS.  This was done via a three step two
	  dimensional linear interpolation between the four corner
	  points of every quadrangle. At the start of the digitization
	  of of every chart, the location of each corner point in X,Y
	  cm and in latitude and longitude is recorded at the head of
	  the data files. The corners are numbered: 1 = lower left
	  corner of chart origin, 2 = upper left corner, 3 = upper right
	  corner, 4 = lower right corner. These corner points are then
	  used to convert each individual X,Y perimeter point to
	  latitude and longitude. If additional files are needed for a
	  given chart, a new set of corner points are digitized and
	  stored at the head of these files.
        Source_Used_Citation_Abbreviation: 1978_MAPS
        Process_Date: 19870603.
      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: 1978_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:
	  All map sheets were plotted by VIMS staff and compared to the
	  original diazo quadrangles for attribute and positional
	  errors. Adjacent polygons of the same density were merged.
	  Beds with more than 0.5 hectares of contiguous area
	  between the plotted bed and the original map bed and beds
	  that are offset by at least 24 meters on their entire
	  perimeter were redigitized. After all errors had been
	  corrected, the map was replotted and the bed areas were
	  compared with those calculated on the PRIME.  A final check
	  was completed by a second person to ensure that all errors
	  had ben corrected and that any newly digitized beds were
	  within the guidelines.
        Source_Used_Citation_Abbreviation: 1978_MAPS, 1978_PHOTOS_S
        Process_Date: 19950726.
      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: 1978_PHOTOS_S, 1978_MAPS
        Process_Date: 19950913.
      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

  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: 1978_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: beds78#
        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: beds78-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:  1978_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:  1978_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:  1978_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
            Enumerated_Domain_Definition: Aberdeen, MD.
            Enumerated_Domain_value: 3
            Enumerated_Domain_Definition: Havre de Grace, MD.
            Enumerated_Domain_value: 4
            Enumerated_Domain_Definition: North East, MD.
            Enumerated_Domain_value: 5
            Enumerated_Domain_Definition: Elkton, MD.-DEL.
            Enumerated_Domain_value: 6
            Enumerated_Domain_Definition: White Marsh, MD.
            Enumerated_Domain_value: 7
            Enumerated_Domain_Definition: Edgewood, MD.
            Enumerated_Domain_value: 8
            Enumerated_Domain_Definition: Perryman, MD.
            Enumerated_Domain_value: 9
            Enumerated_Domain_Definition: Spesutie, MD.
            Enumerated_Domain_value: 10
            Enumerated_Domain_Definition: Earleville, MD.
            Enumerated_Domain_value: 11
            Enumerated_Domain_Definition: Cecilton, MD.
            Enumerated_Domain_value: 12
            Enumerated_Domain_Definition: Baltimore East, MD.
            Enumerated_Domain_value: 13
            Enumerated_Domain_Definition: Middle River, MD.
            Enumerated_Domain_value: 14
            Enumerated_Domain_Definition: Gunpowder Neck, MD.
            Enumerated_Domain_value: 15
            Enumerated_Domain_Definition: Hanesville, MD.
            Enumerated_Domain_value: 16
            Enumerated_Domain_Definition: Betterton, MD.
            Enumerated_Domain_value: 17
            Enumerated_Domain_Definition: Galena, MD.
            Enumerated_Domain_value: 18
            Enumerated_Domain_Definition: Curtis Bay, MD.
            Enumerated_Domain_value: 19
            Enumerated_Domain_Definition: Sparrows Point, MD.
            Enumerated_Domain_value: 20
            Enumerated_Domain_Definition: Swan Point, MD.
            Enumerated_Domain_value: 21
            Enumerated_Domain_Definition: Rock Hall, MD.
            Enumerated_Domain_value: 22
            Enumerated_Domain_Definition: Chestertown, MD.
            Enumerated_Domain_value: 23
            Enumerated_Domain_Definition: Round Bay, MD.
            Enumerated_Domain_value: 24
            Enumerated_Domain_Definition: Gibson Island, MD.
            Enumerated_Domain_value: 25
            Enumerated_Domain_Definition: Love Point, MD.
            Enumerated_Domain_value: 26
            Enumerated_Domain_Definition: Langford Creek, MD.
            Enumerated_Domain_value: 27
            Enumerated_Domain_Definition: Centreville, MD.
            Enumerated_Domain_value: 28
            Enumerated_Domain_Definition: Washington West, MD.-D.C.-VA.
            Enumerated_Domain_value: 29
            Enumerated_Domain_Definition: Washington East, D.C.-MD.
            Enumerated_Domain_value: 30
            Enumerated_Domain_Definition: South River, MD.
            Enumerated_Domain_value: 31
            Enumerated_Domain_Definition: Annapolis, MD.
            Enumerated_Domain_value: 32
            Enumerated_Domain_Definition: Kent Island, MD.
            Enumerated_Domain_value: 33
            Enumerated_Domain_Definition: Queenstown, MD.
            Enumerated_Domain_value: 34
            Enumerated_Domain_Definition: Alexandria, VA.-D.C.-MD.
            Enumerated_Domain_value: 35
            Enumerated_Domain_Definition: Deale, MD.
            Enumerated_Domain_value: 36
            Enumerated_Domain_Definition: Claiborne, MD.
            Enumerated_Domain_value: 37
            Enumerated_Domain_Definition: St. Michaels, MD.
            Enumerated_Domain_value: 38
            Enumerated_Domain_Definition: Easton, MD.
            Enumerated_Domain_value: 39
            Enumerated_Domain_Definition: Fort Belvoir, VA.-MD.
            Enumerated_Domain_value: 40
            Enumerated_Domain_Definition: Mt. Vernon, VA.-MD.
            Enumerated_Domain_value: 41
            Enumerated_Domain_Definition: Lower Marlboro, MD.
            Enumerated_Domain_value: 42
            Enumerated_Domain_Definition: North Beach, MD.
            Enumerated_Domain_value: 43
            Enumerated_Domain_Definition: Tilghman, MD.
            Enumerated_Domain_value: 44
            Enumerated_Domain_Definition: Oxford, MD.
            Enumerated_Domain_value: 45
            Enumerated_Domain_Definition: Trappe, MD.
            Enumerated_Domain_value: 46
            Enumerated_Domain_Definition: Preston, MD.
            Enumerated_Domain_value: 47
            Enumerated_Domain_Definition: Quantico, VA.-MD.
            Enumerated_Domain_value: 48
            Enumerated_Domain_Definition: Indian Head, MD.- VA.
            Enumerated_Domain_value: 49
            Enumerated_Domain_Definition: Benedict, MD.
            Enumerated_Domain_value: 50
            Enumerated_Domain_Definition: Prince Frederick, MD.
            Enumerated_Domain_value: 51
            Enumerated_Domain_Definition: Hudson, MD.
            Enumerated_Domain_value: 52
            Enumerated_Domain_Definition: Church Creek, MD.
            Enumerated_Domain_value: 53
            Enumerated_Domain_Definition: Cambridge, MD.
            Enumerated_Domain_value: 54
            Enumerated_Domain_Definition: East New Market, MD.
            Enumerated_Domain_value: 55
            Enumerated_Domain_Definition: Widewater, VA.-MD.
            Enumerated_Domain_value: 56
            Enumerated_Domain_Definition: Nanjemoy, MD.
            Enumerated_Domain_value: 57
            Enumerated_Domain_Definition: Mathias Point, MD.-VA.
            Enumerated_Domain_value: 58
            Enumerated_Domain_Definition: Popes Creek, MD.
            Enumerated_Domain_value: 59
            Enumerated_Domain_Definition: Mechanicsville, MD.
            Enumerated_Domain_value: 60
            Enumerated_Domain_Definition: Broomes Island, MD.
            Enumerated_Domain_value: 61
            Enumerated_Domain_Definition: Cove Point, MD.
            Enumerated_Domain_value: 62
            Enumerated_Domain_Definition: Taylors Island, MD.
            Enumerated_Domain_value: 63
            Enumerated_Domain_Definition: Golden Hill, MD.
            Enumerated_Domain_value: 64
            Enumerated_Domain_Definition: Passapatanzy, MD.-VA.
            Enumerated_Domain_value: 65
            Enumerated_Domain_Definition: King George, VA.-MD.
            Enumerated_Domain_value: 66
            Enumerated_Domain_Definition: Dahlgren, VA.-MD.
            Enumerated_Domain_value: 67
            Enumerated_Domain_Definition: Colonial Beach North, VA.-MD.
            Enumerated_Domain_value: 68
            Enumerated_Domain_Definition: Rock Point, MD.
            Enumerated_Domain_value: 69
            Enumerated_Domain_Definition: Leonardtown, MD.
            Enumerated_Domain_value: 70
            Enumerated_Domain_Definition: Hollywood, MD.
            Enumerated_Domain_value: 71
            Enumerated_Domain_Definition: Solomons Island, MD.
            Enumerated_Domain_value: 72
            Enumerated_Domain_Definition: Barren Island, MD.
            Enumerated_Domain_value: 73
            Enumerated_Domain_Definition: Honga, MD.
            Enumerated_Domain_value: 74
            Enumerated_Domain_Definition: Wingate, MD.
            Enumerated_Domain_value: 75
            Enumerated_Domain_Definition: Nanticoke, MD.
            Enumerated_Domain_value: 76
            Enumerated_Domain_Definition: Colonial Beach South, VA.-MD.
            Enumerated_Domain_value: 77
            Enumerated_Domain_Definition: Stratford Hall, VA.-MD.
            Enumerated_Domain_value: 78
            Enumerated_Domain_Definition: St. Clements Island, VA.-MD.
            Enumerated_Domain_value: 79
            Enumerated_Domain_Definition: Piney Point, MD.-VA.
            Enumerated_Domain_value: 80
            Enumerated_Domain_Definition: St. Mary's City, MD.
            Enumerated_Domain_value: 81
            Enumerated_Domain_Definition: Point No Point, MD.
            Enumerated_Domain_value: 82
            Enumerated_Domain_Definition: Richland Point, MD.
            Enumerated_Domain_value: 83
            Enumerated_Domain_Definition: Bloodsworth Island, MD.
            Enumerated_Domain_value: 84
            Enumerated_Domain_Definition: Deal Island, MD.
            Enumerated_Domain_value: 85
            Enumerated_Domain_Definition: Monie, MD.
            Enumerated_Domain_value: 86
            Enumerated_Domain_Definition: Champlain, VA.
            Enumerated_Domain_value: 87
            Enumerated_Domain_Definition: Machodoc, VA.
            Enumerated_Domain_value: 88
            Enumerated_Domain_Definition: Kinsale, VA.-MD.
            Enumerated_Domain_value: 89
            Enumerated_Domain_Definition: St. George Island, MD.-VA.
            Enumerated_Domain_value: 90
            Enumerated_Domain_Definition: Point Lookout, MD.
            Enumerated_Domain_value: 91
            Enumerated_Domain_Definition: Kedges Straits, MD.
            Enumerated_Domain_value: 92
            Enumerated_Domain_Definition: Terrapin Sand Point, MD.
            Enumerated_Domain_value: 93
            Enumerated_Domain_Definition: Marion, MD.
            Enumerated_Domain_value: 94
            Enumerated_Domain_Definition: Mount Landing, VA.
            Enumerated_Domain_value: 95
            Enumerated_Domain_Definition: Tappahannock, VA.
            Enumerated_Domain_value: 96
            Enumerated_Domain_Definition: Lottsburg, VA.
            Enumerated_Domain_value: 97
            Enumerated_Domain_Definition: Heathsville, VA.-MD.
            Enumerated_Domain_value: 98
            Enumerated_Domain_Definition: Burgess, VA.-MD.
            Enumerated_Domain_value: 99
            Enumerated_Domain_Definition: Ewell, MD.-VA.
            Enumerated_Domain_value: 100
            Enumerated_Domain_Definition: Great Fox Island, MD.-VA.
            Enumerated_Domain_value: 101
            Enumerated_Domain_Definition: Crisfield, MD.-VA.
            Enumerated_Domain_value: 102
            Enumerated_Domain_Definition: Saxis, VA.-MD.
            Enumerated_Domain_value: 103
            Enumerated_Domain_Definition: Dunnsville, VA.
            Enumerated_Domain_value: 104
            Enumerated_Domain_Definition: Morattico, VA.
            Enumerated_Domain_value: 105
            Enumerated_Domain_Definition: Lively, VA.
            Enumerated_Domain_value: 106
            Enumerated_Domain_Definition: Reedville, VA.
            Enumerated_Domain_value: 107
            Enumerated_Domain_Definition: Tangier Island, VA.
            Enumerated_Domain_value: 108
            Enumerated_Domain_Definition: Chesconessex, VA.
            Enumerated_Domain_value: 109
            Enumerated_Domain_Definition: Parksley, VA.
            Enumerated_Domain_value: 110
            Enumerated_Domain_Definition: Urbanna, VA.
            Enumerated_Domain_value: 111
            Enumerated_Domain_Definition: Irvington, VA.
            Enumerated_Domain_value: 112
            Enumerated_Domain_Definition: Fleets Bay, VA.
            Enumerated_Domain_value: 113
            Enumerated_Domain_Definition: Nandua Creek, VA.
            Enumerated_Domain_value: 114
            Enumerated_Domain_Definition: Pungoteague, VA.
            Enumerated_Domain_value: 115
            Enumerated_Domain_Definition: West Point, VA.
            Enumerated_Domain_value: 116
            Enumerated_Domain_Definition: Saluda, VA.
            Enumerated_Domain_value: 117
            Enumerated_Domain_Definition: Wilton, VA.
            Enumerated_Domain_value: 118
            Enumerated_Domain_Definition: Deltaville, VA.
            Enumerated_Domain_value: 119
            Enumerated_Domain_Definition: Jamesville, VA.
            Enumerated_Domain_value: 120
            Enumerated_Domain_Definition: Toano, VA.
            Enumerated_Domain_value: 121
            Enumerated_Domain_Definition: Gressitt, VA.
            Enumerated_Domain_value: 122
            Enumerated_Domain_Definition: Ware Neck, VA.
            Enumerated_Domain_value: 123
            Enumerated_Domain_Definition: Mathews, VA.
            Enumerated_Domain_value: 124
            Enumerated_Domain_Definition: Franktown, VA.
            Enumerated_Domain_value: 125
            Enumerated_Domain_Definition: Westover, VA.
            Enumerated_Domain_value: 126
            Enumerated_Domain_Definition: Charles City, VA.
            Enumerated_Domain_value: 127
            Enumerated_Domain_Definition: Brandon, VA.
            Enumerated_Domain_value: 128
            Enumerated_Domain_Definition: Norge, VA.
            Enumerated_Domain_value: 129
            Enumerated_Domain_Definition: Williamsburg, VA.
            Enumerated_Domain_value: 130
            Enumerated_Domain_Definition: Clay Bank, VA.
            Enumerated_Domain_value: 131
            Enumerated_Domain_Definition: Achilles, VA.
            Enumerated_Domain_value: 132
            Enumerated_Domain_Definition: New Point Comfort, VA.
            Enumerated_Domain_value: 133
            Enumerated_Domain_Definition: Cape Charles, VA.
            Enumerated_Domain_value: 134
            Enumerated_Domain_Definition: Cheriton, VA.
            Enumerated_Domain_value: 135
            Enumerated_Domain_Definition: Savedge, VA.
            Enumerated_Domain_value: 136
            Enumerated_Domain_Definition: Claremont, VA.
            Enumerated_Domain_value: 137
            Enumerated_Domain_Definition: Surry, VA.
            Enumerated_Domain_value: 138
            Enumerated_Domain_Definition: Hog Island, VA.
            Enumerated_Domain_value: 139
            Enumerated_Domain_Definition: Yorktown, VA.
            Enumerated_Domain_value: 140
            Enumerated_Domain_Definition: Poquoson West, VA.
            Enumerated_Domain_value: 141
            Enumerated_Domain_Definition: Poquoson East, VA.
            Enumerated_Domain_value: 142
            Enumerated_Domain_Definition: Elliotts Creek, VA.
            Enumerated_Domain_value: 143
            Enumerated_Domain_Definition: Townsend, VA.
            Enumerated_Domain_value: 144
            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: 1978 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/beds78.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.