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.
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
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:
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:
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: 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: 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:
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
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/beds78.tar.Z
(pkzip format)
URL ftp://ftp.vims.edu/pub/data/sav/beds78.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