Metadata for 2008 Chesapeake Bay SAV Coverage These metadata describe the 2008 Submerged Aquatic Vegetation (SAV) coverage dataset that was produced at the Virginia Institute of Marine Science from aerial photography flown in 2008. 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 2009
Title: 2008 Chesapeake Bay SAV Coverage
Publication_Information:
Publication_Place: Gloucester Point, Virginia
Publisher: Virginia Institute of Marine Science
Description:
Abstract:
The 2008 Chesapeake Bay SAV Coverage was mapped from 1:24,000 black
and white aerial photography to assess water quality in the Bay.
Each area of SAV was interpreted from the rectified photography and
classified into one of four density classes by the percentage of cover.
The SAV beds were entered into an ArcInfo 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: 20080525
Ending_Date: 20081111
Currentness_Reference: Ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.500
East_Bounding_Coordinate: -75.000
North_Bounding_Coordinate: 39.750
South_Bounding_Coordinate: 36.500
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 for all beds has been reviewed by an experienced
photo-interpreter for correctness and consistency with analysis for
prior years.
Logical_Consistency_Report:
The coverage contains full ArcInfo 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
orthorectification of scanned aerial photography using USGS
digital orthothophoto quadrangles for horizontal control and
USGS 30m DEM data as vertical control. Horizontal RMSE for
individual flightlines was held to less than four meters.
Lineage:
Source_Information:
Source_Citation: 2008 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: 20080525
Ending_Date: 20081111
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 2008_PHOTOS
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation: 2008 SAV Orthophoto Mosaics
Source_Scale_Denominator: 24000
Type_of_Source_Media: discM
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20080525
Ending_Date: 20081111
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 2008_MOSAICS
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
State boundaries adjusted to include shore areas
Source_Scale_Denominator: none
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080106
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: STATES
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
New 2004 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: 20080106
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: CBPSEGS04
Source_Contribution: spatial and attribute information
Process_Step:
Process_Description:
Scanned aerial photographs were georectified and
orthographically corrected to produce a seamless series of
aerial mosaics following a set of standard operating
procedures (SOP). Leica LPS image processing software
was used to orthographically correct the individual flight
lines using a bundle block solution. Camera lens calibration
data was matched to the image location of fiducial points to
define the interior camera model. Control points from USGS
DOQQ images provide the exterior control, which is enhanced
by a large number of image-matching tie points produced
automatically by the software. The exterior and interior
models were combined with a 30-meter resolution digital
elevation model (DEM) from the USGS National Elevation
Dataset (NED) to produce an orthophoto for each aerial
photograph.
The orthophotographs that cover each USGS 7.5 minute
quadrangle area were adjusted to approximately uniform
brightness and contrast and were mosaicked together using the
Leica GeoSystems ERDAS Imagine mosaic tool to produce a one-
meter resolution quad-sized mosaic.
Source_Used_Citation_Abbreviation: 2008_PHOTOS, 2008_MOSAICS
Process_Date: 20090323
Process_Step:
Process_Description:
The SAV beds were interpreted on-screen from the orthophoto
mosaics using ESRI ArcGIS software. The identification
and delineation of SAV beds by photo interpretation utilized
all available information including: knowledge of aquatic
grass signatures on film, distribution of SAV in 2008 from
aerial photography, 2008 ground survey information, and
aerial site surveys.
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 crown cover of forest trees 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 variations of SAV density. Additionally, each
distinct SAV bed or bed subsection was assigned an
identifying one or two letter designation unique to its map.
Coupled with the appropriate SAV map number and year of
photography, these letter designations uniquely identify each
SAV bed in the database.
After all quadrangles were digitized, the resulting digital
data was combined to form a single data set for the entire
Bay. The quadrangle borders were then checked and edited
(edgematched) to ensure that the SAV polygons were
consistent. Inconsistencies were resolved by reviewing all
the available photography.
Source_Used_Citation_Abbreviation: 2008_MOSAICS, 2008_PHOTOS,
Process_Date: 20090506
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: CBPSEGS04
Process_Date: 20090506
Process_Step:
Process_Description:
The state boundaries were overlayed on the dataset by VIMS staff,
dividing any beds that fell into multiple states.
Source_Used_Citation_Abbreviation: STATES
Process_Date: 20090506
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: 2008_MAPS
Attribute:
Attribute_Label: Area
Attribute_Definition: Area of the GT-polygon
Attribute_Definition_Source: ArcInfo 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: ArcInfo 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: Beds07#
Attribute_Definition: Internal GT-polygon number
Attribute_Definition_Source: ArcInfo calculation
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: Beds07-id
Attribute_Definition: User GT-polygon number
Attribute_Definition_Source: ArcInfo 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.
Attribute_Definition_Source: 2008_MAPS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: AA
Range_Domain_Maximum: ZZ
Attribute:
Attribute_Label: Density
Attribute_Definition: SAV bed density classification. A ZERO
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: 2008_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: QuadID
Attribute_Definition: Identification number of USGS quads that contains
the SAV bed
Attribute_Definition_Source: 2008 Distribution of SAV in the
Chesapeake Bay, Final Report to U.S. EPA, Chesapeake Bay Program.
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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: 178
Enumerated_Domain_Definition: Bethel Beach, VA.
Enumerated_Domain_value: 179
Enumerated_Domain_Definition: Goose Island, VA.
Enumerated_Domain_value: 180
Enumerated_Domain_Definition: Horseshoe Point, MD.
Enumerated_Domain_value: 181
Enumerated_Domain_Definition: Bowie, MD.
Enumerated_Domain_value: 182
Enumerated_Domain_Definition: Smith Point, VA.-MD.
Enumerated_Domain_value: 183
Enumerated_Domain_Definition: East of Reedville, VA.
Enumerated_Domain_value: 184
Enumerated_Domain_Definition: Cobb Island, VA.
Enumerated_Domain_value: 185
Enumerated_Domain_Definition: Suffolk, VA.
Enumerated_Domain_value: 186
Enumerated_Domain_Definition: Fisherman's Island, VA.
Enumerated_Domain_value: 187
Enumerated_Domain_Definition: Exmore, VA.
Enumerated_Domain_value: 188
Enumerated_Domain_Definition: Kingston, MD.
Enumerated_Domain_value: 189
Enumerated_Domain_Definition: Eden, MD.
Enumerated_Domain_value: 190
Enumerated_Domain_Definition: Rhodesdale, MD.
Enumerated_Domain_value: 191
Enumerated_Domain_Definition: Sharptown, MD.
Enumerated_Domain_value: 192
Enumerated_Domain_Definition: Hobbs, MD.
Enumerated_Domain_value: 193
Enumerated_Domain_Definition: Church Hill, MD.
Enumerated_Domain_value: 194
Enumerated_Domain_Definition: Lancaster, VA.
Enumerated_Domain_value: 195
Enumerated_Domain_Definition: Gloucester, VA.
Enumerated_Domain_value: 196
Enumerated_Domain_Definition: Princess Anne, MD.
Enumerated_Domain_value: 197
Enumerated_Domain_Definition: Haynesville, VA.
Enumerated_Domain_value: 198
Enumerated_Domain_Definition: Hallwood, VA. - MD.
Enumerated_Domain_value: 199
Enumerated_Domain_Definition: Millington, MD.
Enumerated_Domain_value: 200
Enumerated_Domain_Definition: Rollins Fork, VA.
Enumerated_Domain_value: 201
Enumerated_Domain_Definition: Loretto, VA.
Enumerated_Domain_value: 202
Enumerated_Domain_Definition: Pocomoke City, MD. - VA.
Enumerated_Domain_value: 203
Enumerated_Domain_Definition: Diputanta North, VA.
Enumerated_Domain_value: 204
Enumerated_Domain_Definition: Hopewell, VA.
Enumerated_Domain_value: 205
Enumerated_Domain_Definition: Chester, VA.
Enumerated_Domain_value: 206
Enumerated_Domain_Definition: Drewrys Bluff, VA.
Enumerated_Domain_value: 207
Enumerated_Domain_Definition: Dutch Gap, VA.
Enumerated_Domain_value: 208
Enumerated_Domain_Definition: Roxbury, VA.
Enumerated_Domain_value: 209
Enumerated_Domain_Definition: Providence Forge, VA.
Enumerated_Domain_value: 210
Enumerated_Domain_Definition: Walkers, VA.
Enumerated_Domain_value: 211
Enumerated_Domain_Definition: Richmond, VA.
Enumerated_Domain_value: 212
Enumerated_Domain_Definition: Ship Shoal Inlet, VA.
Enumerated_Domain_value: 213
Enumerated_Domain_Definition: Great Machipongo Inlet, VA.
Enumerated_Domain_value: 214
Enumerated_Domain_Definition: Nassawadox, VA.
Enumerated_Domain_value: 215
Enumerated_Domain_Definition: Quinbly Inlet, VA.
Enumerated_Domain_value: 216
Enumerated_Domain_Definition: Wachapreague, VA.
Enumerated_Domain_value: 217
Enumerated_Domain_Definition: Accomax, VA.
Enumerated_Domain_value: 218
Enumerated_Domain_Definition: Metompkin Inlet, VA.
Enumerated_Domain_value: 219
Enumerated_Domain_Definition: Bloxom, VA.
Enumerated_Domain_value: 220
Enumerated_Domain_Definition: Wallops Island, VA.
Enumerated_Domain_value: 221
Enumerated_Domain_Definition: Deep Creek, VA.
Enumerated_Domain_value: 222
Enumerated_Domain_Definition: Fentress, VA.
Enumerated_Domain_value: 223
Enumerated_Domain_Definition: Pleasant Ridge, VA.
Enumerated_Domain_value: 224
Enumerated_Domain_Definition: Creeds, VA.
Enumerated_Domain_value: 225
Enumerated_Domain_Definition: King William, VA.
Enumerated_Domain_value: 226
Enumerated_Domain_Definition: King & Queen Courthouse, VA.
Enumerated_Domain_value: 227
Enumerated_Domain_Definition: Truhart, VA.
Enumerated_Domain_value: 228
Enumerated_Domain_Definition: Tunstall, VA.
Enumerated_Domain_value: 229
Enumerated_Domain_Definition: New Kent, VA.
Enumerated_Domain_value: 230
Enumerated_Domain_Definition: Manquin, VA.
Enumerated_Domain_value: 231
Enumerated_Domain_Definition: Port Royal, VA.
Enumerated_Domain_value: 232
Enumerated_Domain_Definition: Wachapreague East, VA.
Enumerated_Domain_value: 233
Enumerated_Domain_Definition: Aylett, VA.
Enumerated_Domain_value: 234
Enumerated_Domain_Definition: Snow Hill, MD.
Enumerated_Domain_value: 235
Enumerated_Domain_Definition: Montross, VA.
Attribute:
Attribute_Label: CBPSEG
Attribute_Definition: Chesapeake Bay Program segment which contains
the SAV bed
Attribute_Definition_Source: CBPSEGS04
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Chesapeake Bay Program Segment abbreviations ("AAWPH", "IOWPH", "SPXPH",
"CHNPH", and "SVCPH" have been added to identify the Delmarva coastal bays)
Codeset_Source: Chesapeake Bay Program
Attribute:
Attribute_Label: STATE
Attribute_Definition: U.S. State which contains the SAV bed
(currently blank)
Attribute:
Attribute_Label: Zone
Attribute_Definition: Bay zone which contains the the SAV bed
Attribute_Definition_Source: CBPSEGS04
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_value: 1
Enumerated_Domain_Definition: CB1TF1,CB1TF2, NORTF, ELKOH1,
ELK0H2, C&DOH, BOHOH, SASOH1, SAVOH2, CB2OH, CB3MH, BSHOH,
GUNOH1, GUNOH2, 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, PAXMH1,
PAXMH2, PAXMH3, PAXMH4, PAXMH5, PAXMH6, PAXOH, PAXTF,
HNGMH, FSBMH, NANMH, NANOH, NANTF, WICMH, MANMH1, MANMH2,
BIGMH1, BIGMH2, POCMH, POCOH, POCTF, TANMH1, TANMH2, POTMH,
POTOH1, POTOH2, POTOH3, 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,
JMSTF1, JMSTF2, APPTF, LYNPH, CB8PH (Lower Bay)
Enumerated_Domain_value: 4
Enumerated_Domain_Definition: AAWPH, CHNPH, IOWPH, SPXPH,
SVCPH (Delmarva Peninsula Coastal Bays)
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
Enumerated_Domain_value: P
Enumerated_Domain_Definition: Area was mapped at less than
maximum biomass
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: 2008 Chesapeake Bay SAV Coverage
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 9.3
Format_Specification: Coverage
Digital_Transfer_Option:
Offline_Option:
Offline_Media: DVD-R
Recording_Format:
ASCII
Online_Option:
Access_Instructions:
The data can be downloaded from
http://www.vims.edu/bio/sav.
Metadata_Reference_Information:
Metadata_Date: 20091222
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