These metadata describe the 1993 Submerged Aquatic Vegetation (SAV) coverage dataset that was produced at the Virginia Institute of Marine Science from aerial photography flown in 1993. 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: 1993 Chesapeake Bay SAV Coverage
Publication_Information:
Publication_Place: Gloucester Point, Virginia
Publisher: Virginia Institute of Marine Science
Description:
Abstract:
The 1993 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 into an Arc/Info GIS coverage using
the quality control 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: 19930523
Ending_Date: 19930914
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. The
mylars were then digitized within 24 meters of the interperted line.
Lineage:
Source_Information:
Source_Citation: 1993 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: 19930523
Ending_Date: 19930914
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 1993_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: 19930523
Ending_Date: 19930914
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 1993_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 1993 from aerial photography, 1993
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 1993 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: 1993_PHOTOS, 1993_MAPS
Process_Date: 19940523.
Process_Step:
Process_Description:
The perimeters of all SAV beds mapped from the aerial photography
onto the contact mylar copies were digitized in ARC/INFO,
using an Altek Model 41 tablet, with a resolution of 0.001
inches (0.00254 cm) and an accuracy of 0.005 inches (0.0127
cm). The beds for each quadrangle were digitized twice into
two separate ARC/INFO coverages. Each coverage was plotted
at an exact scale of 1:24,000 on translucent plotter paper
and overlaid on the original mylar for visual checking. In
instances where the digitized SAV bed boundaries did not
correspond to the original, the bed was redigitized. Once
the SAV outlines on both coverages passed visual inspection,
a bed-by-bed comparison of the areas (sq. meters) was made as
an additional quality assurance check. Beds were rejected
and redigitized if they were larger than 1 hectare and there
was a difference of greater that 1.0% area between the two
coverages. The bed-by-bed comparison was useful in
identifying instances where SAV beds were incorrectly
labeled, thus eliminating coding errors.
Source_Used_Citation_Abbreviation: 1993_MAPS
Process_Date: 19940606.
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: 1993_PHOTOS, 1993_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 YA on CF101 was corrected to be 3. The density
of VA on DV118 was corrected to be 4. The density of EA on
CH134 was corrected to be 4.
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: 1993_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: 1993_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: 1993_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: 1993_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: 1993 Distribution of SAV in the
Chesapeake Bay, Final Report to U.S. EPA, Chesapeake Bay Program.
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Enumerated_Domain_Definition: Nandua Creek, VA.
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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: 1993 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/beds93.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