Identification_Information:
Citation:
Citation_Information:
Originator: Comprehensive Coastal Inventory, VIMS, College of
William and Mary
Publication_Date: 1974-1988
Title: Tidal Marsh Inventory (TMIALL83)
Publication_Information:
Publication_Place: Gloucester Point, VA
Publisher: Virginia Institute of Marine Science
Description:
Abstract:
The Tidal Marsh Inventory (TMI) data are the digitized record
of the VIMS Tidal Marsh Inventories developed by the Wetlands Research
Program at the Virginia Institute of Marine Science (VIMS). Tidal
wetlands were inventoried as mandated by Section 62.1-13.4 of the
Virginia Wetlands Act of 1972. This effort began in 1972 and
continued through the mid 1980's. The conversion to digital format
was complete in 1992. No revisions to the data have occurred since
the original data collection.
Purpose:
The TMI data can be used for monitoring changes in wetland
resources, identifying environmentally sensitive areas for planning
and landuse purposes, and to assist agencies regulating encroachment
into tidal wetlands.
Supplemental_Information:
Tidal wetlands data were collected through site visits to all tidal
marshes in Virginia using aerial photography for assistance. The
geographic boundaries of tidal marshes were digitized from
stable-based mylar, USGS 7.5 minute topographic quadrangle maps
(scale = 1:24000). Aerial photography was used to correct for
obvious discrepancies in the boundaries observed. The community
structure and composition was described through site visits
to all tidal marshes in the Tidewater region of Virginia. Digitized
marsh polygons are coded for marsh or community type, marsh number,
and county location. Community type is defined in accordance with
criteria outlined in the WETLANDS GUIDELINES published by the VMRC
in 1993. Marsh number refers to the catalogue number assigned to a
specific polygon in the corresponding hardcopy publication. The
Federal Information Processing System (FIPS) codes are used for
"county" locator.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1974
Ending_Date: 1988
Currentness_Reference: Publication date of sources
Status:
Progress: Complete
Maintenance_and_Update_Frequency: none
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.48525413
East_Bounding_Coordinate: -75.24489847
North_Bounding_Coordinate: 38.91213452
South_Bounding_Coordinate: 36.5293086
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Tidal Marsh Inventory
Theme_Keyword: TMI
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Tidewater Virginia
Access_Constraints: none
Use_Constraints:
Not for use in determining jurisdictional boundaries for regulatory
purposes.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Marcia Berman
Contact_Organization: Virginia Institute of Marine Science (VIMS)
Contact_Position: Director of Comphrehensive Coastal Inventory Program
Contact_Address:
Address_Type: mailing address
Address: P.O. Box 1346
City: Gloucester Point
State_or_Province: Virginia
Postal_Code: 23062
Country: USA
Contact_Voice_Telephone: (804) 684-7188
Contact_Facsimile_Telephone: (804) 684-7182
Contact_Electronic_Mail_Address: marcia@vims.edu
Native_Data_Set_Environment:
SunOS, 4.1.4, sun4c UNIX
ARC/INFO version 7.0.3
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Digitized boundaries and codes are plotted to scale and overlaid
onto original map medium to check for accuracy. Coding is checked
by the supervisor or senior staff against the digitized record.
A minimum of two checks have been performed for each topographic
quadrangle.
Logical_Consistency_Report: Polygon topology present. All dangling arcs
were removed.
Completeness_Report:
All polygons are labeled with a FIPS code. Many marshes smaller than
one quarter acre (usually narrow fringing marshes) do not have a
type label or a marsh number.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Digital boundaries of the tidal marshes were plotted at
1:24000 scale and overlayed on USGS 7.5' mylar topographic
maps.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Dept. of Wetlands Ecology, VIMS, College of William
and Mary
Publication_Date: 1974-1988
Title:
Tidal Marsh Inventories Special Report in Applied Marine
Science and Ocean Engineering
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: by Tidewater locality
Issue_Identification: by Tidewater locality
Publication_Information:
Publication_Place: Gloucester Point, VA
Publisher: Virginia Institute of Marine Science
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: 1974
Ending_Date: 1988
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: spatial and attribute information
Process_Step:
Process_Description:
Stable-based topographic maps were registered to geographic
coordinates, marsh boundaries were digitzed and polygons labeled.
Arcedit weed tolerance was set to 0.001, nodesnap and snapping
closest were set to 10 meters. The coverages were cleaned with
a fuzzy tolerance of .001 inches (1 m in UTM). Accurracy was
checked by overlaying a check plot onto the original base map.
The completed quadrangles were then appended, the quad
boundaries removed, and edgematch problems resolved.
Process_Date: 1996
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 18628
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 43400
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 18629
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: 0.8593174219131
Ordinate_Resolution: 0.8593174219131
Planar_Distance_Units: METERS
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Tidal marsh
Entity_Type_Definition: Polygons representing a tidal marsh
Entity_Type_Definition_Source: Inhouse inventory and FIPS codes
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of poly/region in square coverage units
Attribute_Definition_Source: ArcInfo Computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999999.999
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of poly/region in coverage units
Attribute_Definition_Source: ArcInfo Computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999999.999
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: TMIALL83#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: ArcInfo Computed
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999999
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: TMIALL83-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999999
Attribute_Measurement_Resolution: 1
Attribute:
Attribute_Label: MFIPS
Attribute_Definition: FIPS code/VIMS marsh number
Attribute_Definition_Source: Federal Government/VIMS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Water
Enumerated_Domain_Value_Definition_Source:
Tidal Marsh Inventories Special Report in Applied Marine
Science and Ocean Engineering, Virginia Institute of Marine
Science
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Land
Enumerated_Domain_Value_Definition_Source:
Tidal Marsh Inventories Special Report in Applied Marine
Science and Ocean Engineering, Virginia Institute of Marine
Science
Enumerated_Domain_Value: xxxx
Enumerated_Domain_Value_Definition: marsh number
Enumerated_Domain_Value_Definition_Source:
Tidal Marsh Inventories Special Report in Applied Marine
Science and Ocean Engineering, Virginia Institute of Marine
Science
Attribute:
Attribute_Label: FIPS
Attribute_Definition:
Federal Information Processing System (FIPS)
codes
Attribute_Definition_Source: Federal Government
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Federal Information Processing System
Codeset_Source: Federal Government
Attribute:
Attribute_Label: MARSHNO
Attribute_Definition: VIMS marsh number
Attribute_Definition_Source:
Catalogue number of each polygon from
VIMS hardcopy publication
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 99999999
Attribute:
Attribute_Label: TYPE
Attribute_Definition: Marsh or wetland community type
Attribute_Definition_Source: Wetlands Guidelines
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Saltmarsh Cordgrass Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Saltmeadow Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Black Needlerush Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition: Saltbush Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Big Cordgrass Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition: Cattail Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition: Arrow Arum-Pickerelweed Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition: Reed Grass Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 9
Enumerated_Domain_Value_Definition: Yellow Pond Lily Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Saltwort Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition: Freshwater Mixed Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Enumerated_Domain_Value: 12
Enumerated_Domain_Value_Definition: Brackish Water Mixed Community
Enumerated_Domain_Value_Definition_Source: Wetlands Guidelines
Overview_Description:
Entity_and_Attribute_Overview:
Polygons (PAT) attribute table contains four items: MFIPS, FIPS,
MARSHNO, and TYPE. The item definition is 7, 7, I for the first
three items, and 2, 2, I for TYPE. Each code is numeric identifier
for a marsh, a wetland community, or the county the wetland is found
within. The MFIPS item includes the codes 1 and 2 for water and land.
If there is more than one water or upland poly within a coverage,
there will be multiple polygons with the same MFIPS code. MFIPS
will only be unique for those items coded as marshes. If MFIPS=1
(water) then FIPS=0 and MARSHNO=1. If MFIPS=2 (land), then FIPS=0
and MARSHNO=2. There are twelve marsh types that describe various
vegetative communities.
Entity_and_Attribute_Detail_Citation:
Virginia Marine Resources Commission. 1993. WETLANDS GUIDELINES,
Virginia Marine Resources Commission, Habitat Management Division,
and the Virginia Institute of Marine Science, Dept. of Wetlands
Ecology, Newport News, Virginia, pp.74.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Virginia Institute of Marine Science (VIMS)
Contact_Position: Director of Comphrehensive Coastal Inventory Program
Contact_Address:
Address_Type: mailing address
Address: P.O. Box 1346
City: Gloucester POint
State_or_Province: Virginia
Postal_Code: 23062
Country: USA
Contact_Voice_Telephone: (804) 684-7188
Contact_Facsimile_Telephone: (804) 684-7182
Contact_Electronic_Mail_Address: marcia@vims.edu
Distribution_Liability:
The Comprehensive Coastal Inventory Program (CCI) at VIMS performs
a service by distributing data generated by either CCI or public
agencies which offer data without restriction or charge. CCI
assumes no responsibility for data accuracy or precision, metadata
completeness or correctness for digital information generated by other
agencies. CCI assumes no liability for misuse of any data which may arise
as a result of any alteration, conversion, or combination with other
data sources. As well, the timeliness and scale of these products
must be considered when evaluating appropriate use.
Metadata_Reference_Information:
Metadata_Date: 19971021
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Virginia Institute of Marine Science (VIMS)
Contact_Person: Tamia Rudnicky
Contact_Position: Programmer
Contact_Address:
Address_Type: mailing address
Address: P.O. Box 1346
City: Gloucester Point
State_or_Province: Virginia
Postal_Code: 23062
Country: USA
Contact_Voice_Telephone: (804) 684-7181
Contact_Facsimile_Telephone: (804) 684-7182
Contact_Electronic_Mail_Address: tamia@vims.edu
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: Version of June 8, 1994
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none