These metadata describe the 1991 Submerged Aquatic Vegetation (SAV) coverage dataset that was produced at the Virginia Institute of Marine Science from aerial photography flown in 1991. 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: 1991 Chesapeake Bay SAV Coverage
Publication_Information:
Publication_Place: Gloucester Point, Virginia
Publisher: Virginia Institute of Marine Science
Description:
Abstract:
The 1991 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
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: 19910515
Ending_Date: 19911108
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
Place_Keyword: Chincoteague 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 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: 1991 SAV Aerial photography
Source_Scale_Denominator: 24000
Type_of_Source_Media: 9x9 inch b&w negatives
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19910515
Ending_Date: 19911108
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 1991_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: 19910515
Ending_Date: 19911108
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 1991_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 utilized all available information
including: knowledge of aquatic grass signatures on film,
distribution of SAV in 1991 from aerial photography, 1991
ground survey information, and aerial site surveys. USGS 7.5
minute quadrangle maps (1:24,00 scale) printed by the
Mid-Continent Mapping Center of the National Cartigraphic
Information Center on stable transparent mylar were used as
base maps. Distortion-free, identical copies of these base
maps were made at the same scale on stable transparent mylar
using a contact diazo process.
SAV beds from the 1991 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, 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.
Source_Used_Citation_Abbreviation: 1991_PHOTOS, 1991_MAPS
Process_Date: 19920421.
Process_Step:
Process_Description:
The perimeters of all SAV beds mapped from the aerial
photography onto the diazo mylar copies were digitized 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).
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 1991 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 saved by the computer program and transferred to the
ARC/INFO GIS system for area calculations and inclusion in
the SAV data base.
Source_Used_Citation_Abbreviation: 1991_MAPS
Process_Date: 19920604.
Process_Step:
Process_Description:
During 1991, the VIMS SAV program began converting its
operation from the Prime to ARC/INFO based on a SUN Sparc 2
Unix workstaion. With the assistance of the Virginia
Department of Environmental Equality, EcoMAPS Office,
procedures were developed in 1991 to convert/transform the
best bed perimeter points from X,Y centimeters to UTM based
coordinates in ARC/INFO 5.0.1 fromat. This involved
construction of data transfer files in an ARC/INFO standard
format ("generate"). This was done on the VIMS PRIME for
each 7.5 minute quadrangle with SAV beds present. Four files
per quadrangle were produced: 1) Polygon file containing SAV
bed coordinates in digitized=based centimeters. 2) Attribute
files containing SAV bed labels, density, species
composition, and dates. 3) Tic file containing map corner
locations in digitizer-based coordinates (cm). 4) Geo files
containing corresponding latitude and longitude positions for
map corners. The "generate" files were then transferred to
the workstation and imported into the ARC/INFO system. A
system of automated ARC/INFO routines were used to input
quadrangle-based SAV "generate" data into ARC/INFO 5.0.1
format, and to assist in interactive editing of SAV polygons.
ARC/INFO-based SAV polygons were displayed and edited by VIMS
staff. SAV polygons appearing on the conputer display screen
were compared to their counterparts on the diazo mylar
quadrangles. Discrepancies and artifacts were edited using a
suite of ARC/INFO editing "tools." ARC/INFO-based data sets
were considered satisfactory for submission to the EPA when
the shape, location, and label of all SAV beds corresponded
to those on the diazo mylar quadrangles. ARC/INFO-based SAV
data were transformed to UTM coordinates, Zone 18, and
submitted to EPA for final review, analysis, and deposition
to archives.
Source_Used_Citation_Abbreviation: 1991_MAPS
Process_Date: 19920604.
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 mylar maps and
re-interpreting the photography if necessary.
Source_Used_Citation_Abbreviation: 1991_PHOTOS, 1991_MAPS
Process_Date: 19950706.
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: 19950706.
Process_Step:
Process_Description:
The density of EA on AL034 was corrected to be 2. The density
of IA on DL066 was corrected to be 1. The density of HA on
BW083 was corrected to be 2. The density of PA on TG170 was
corrected to be 2.
Process_Date: 19951206.
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: 1991_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: beds91#
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: beds91-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: 1991_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: 1991_MAPS
Attribute_Domain_Values:
Enumerated_Domain:
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: 1991_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: CBPSEGS98
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: 1991 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/beds91.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