20240205
06443300
1.0
FGDC CSDGM Metadata
FALSE
VA_TMI_2011_2019_utm18_multi2single
239.514
284430.282396
478157.245417
4045343.903465
4307022.121814
1
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NAD_1983_UTM_Zone_18N
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Tamia Rudnicky
Comprehensive Coastal Inventory Program, Virginia Institute of Marine Science (VIMS))
GIS Programmer/Analyst
Virginia Institute of Marine Science
Gloucester Point
Virginia
23062
US
(804) 684-7181
Shapefile
File Geodatabase Feature Class
https://www.vims.edu/ccrm/research/inventory/virginia/index.php
239.514
Tidal Marsh Inventory (2011-2019)
2014-12-31T00:00:00
2022-01-13T00:00:00
Virginia Tidal Marsh Inventory
Center for Coastal Resources Management,
Virginia Institute of Marine Science, William & Mary, Gloucester Point, Virginia, 23062.
Center for Coastal Resources Management
Virginia Institute of Marine Science
Gloucester Point
Virginia
23062
US
ground condition
2009-06-01T00:00:00
2018-08-16T00:00:00
To maintain and update an inventory of the distribution of tidal marshes for the Commonwealth of Virginia.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Virginia Institute of Marine Science published the first Tidal marsh Inventories using data collected in the early 1970's. </SPAN><SPAN>Using high resolution color infra-red imagery from 2009, 2011, 2013 and 2017 new Tidal Marsh Inventories have been developed beginning in 2010. Marsh boundaries were generated using heads-up digitizing techniques at a scale of 1:1,000. From 2010 through 2014 marsh polygons were classified by morphologic type: fringe, extensive, embayed, or marsh island. Beginning in 2015, morphologic classification was discontinued. Marshes were ground-truthed in the field where a community type index was assigned to each marsh based on plant community make-up.</SPAN></P><P><SPAN /></P><P><SPAN /></P></DIV></DIV></DIV>
Tidal Marsh Inventory
Virginia
Accomack
Alexandria
Arlington
Caroline
Charles City
Chesapeake
Chesterfield
Essex
Fairfax
Fredericksburg
Gloucester
Hampton
Hanover
Henrico
Hopewell
Isle of Wight
James City
King and Queen
King William
Lancaster
Mathews
Middlesex
New Kent
Newport News
Norfolk
Northampton
Northumberland
Poquoson
Portsmouth
Prince George
Prince William
Richmond
Spotsylvania
Stafford
Suffolk
Surry
Virginia Beach
Westmoreland
Williamsburg
York
Virginia, Accomack, Alexandria, Arlington, Caroline, Charles City, Chesapeake, Chesterfield, Colonial Heights, Essex, Fairfax, Fredericksburg, Gloucester, Hampton, Hanover, Henrico, Hopewell, Isle of Wight, James City, King and Queen, King George, King William, Lancaster, Mathews, Middlesex, New Kent, Newport News, Norfolk, Northampton, Northumberland, Petersburg, Poquoson, Portsmouth, Prince George, Prince William, Richmond, Spotsylvania, Stafford, Suffolk, Surry, Virginia Beach, Westmoreland, Williamsburg, York
Tidal marsh, wetland plant identification, wetland community type
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Center for Coastal Resources Management (CCRM) provides these data with the understanding that they are not guaranteed to be correct or complete, and conclusions drawn from the data set are the sole responsibility of the user. Every attempt has been made to ensure that these data and the documentation are reliable and accurate. CCRM, the Virginia Institute of Marine Science (VIMS), and the Commonwealth of Virginia assume no liability for any damages caused by inaccuracies in the data or documentation; and make no warranty, express or implied, as to the accuracy, completeness, or utility of this information, nor does the fact of distribution constitute a warranty. For more information, visit https://www.vims.edu/ccrm/research/inventory/index.php</SPAN></P><P><SPAN><SPAN>VIMS CCRM must be cited with any use of this data. See Citation section of metadata for appropriate citation.</SPAN></SPAN></P></DIV></DIV></DIV>
For more information please visit https://www.vims.edu/ccrm/research/inventory/index.php
Esri ArcGIS 13.0.0.36056
1
-77.485332
-75.244070
38.911827
36.529198
Karinna Nunez
Virginia Institute of Marine Science
P.O. Box 1346
Gloucester Poiint
Virginia
23062
karinna@vims.edu
US
(804) 684-7273
Field collection of marsh data was performed primarily from a small shallow-draft vessel, navigating at slow speeds parallel to the shoreline. Surveys extended as far upstream as depth and field conditions allowed. Some additional data collection was performed by land where marshes were easily accessible from public lands. During surveys, marsh boundaries were verified, and wetland plant species observed within each marsh polygon were recorded along with relative cover estimates to determine marsh community types.
Processing Dates: summers 2009-2018
Corrections were made to the digital data back at the lab using ArcGis Version 10.0 or above.
Processing Dates: 2009 - 2019
Tidal marshes were delineated from 2009, 2011, 2013, and/or 2017 VBMP imagery using onscreen digitizing techniques at a scale of 1:1,000. Bing and Google Earth online imagery were used to provide additional interpretive information to improve the accuracy of marsh boundaries. Marsh polygons were coded by shape and physiographic setting based on a classification system applied in the first Tidal Marsh Inventories (in the 1970s). Quality assurance and control measures were performed prior to generation of maps for fieldwork. Processing Dates: 2009-2019
2015-03-01T00:00:00
VBMP imagery, with the marsh polygon layer overlay, was printed for use in field surveys of the marshes.
Processing Dates: 2009-2018
2015-04-01T00:00:00
Current Tidal Marsh Inventories (2011 to 2019) were merged together.
2019-02-14T00:00:00
Tidal marshes for King and Queen, King William, and New Kent counties were originally published in 2010. These localities were updated using 2017 VBMP imagery but were not field checked. Any community type information listed is from the 2009-2010 tidal marsh survey.
2022-01-13T00:00:00
Tidal marshes observed in the field are the only polygons to be coded for marsh community type. Field collection of marsh data was performed primarily from a small shallow-draft vessel. Surveys extended as far upstream as depth and field conditions allowed. During surveys, marsh boundaries were verified, and wetland plant species observed within each marsh polygon were recorded along with relative cover estimates to determine marsh community types. Some marshes were surveyed by land.
Polygons do not self intersect. Topology has been validated. There are no overlapping polygons, however, there may be small gaps between polygons.
EPSG
6.11(3.0.1)
VA_TMI_2011_2019_utm18_multi2single
Feature Class
0
Virginia tidal marshes
processor
OBJECTID_1
OBJECTID_1
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
OBJECTID
OBJECTID
Integer
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
ESRI
Coordinates defining the features.
MarshType
MarshType
String
50
0
0
Tidal marshes take on several different morphologies. They can be embayed features that are set into the landscape with upland areas along the marsh edges. They can also be large extensive features that extend into the open water and have water on two or three sides. Fringe marshes grow nearly parallel to the shoreline and can be wide or narrow. An isolated marsh surrounded on all sides by open water; interior portions of the marsh may contain trees scattered at highest elevations In all cases, wetland vegetation must be relatively well established, although not necessarily healthy.
Tidal Marsh Inventories – Community Types & Field Codes
20140601
Marsh type: Embayed, Extensive, Marsh Island and Marsh Fringe <5 feet, 5-30 feet and >30 feet. Begining in 2015 morphologic description of the marsh was discontinued. Marsh polygon description is now Marsh, Marsh Island, NoMarsh-Forest, NoMarsh-ScrubShrub, NoMarsh_Sand, or Water.
CmtyType
CmtyType
String
254
0
0
Marsh Community Type based on vegetational composition.
Processor
20140401
Marsh Community Type: I = Saltmarsh Cordgrass/low marsh,II = Saltmeadow/high marsh, III = Black Needlerush, IV = Saltbush, V = Big Cordgrass, VI = Cattail, VII = Arrow Arum, VIII = Reedgrass, IX = Yellow Pond Lily, X = Saltwort, XI = Freshwater mix, XII = Brackish mix
Reedgrass
Reedgrass
String
254
0
0
Amount of Reedgrass (Phragmites australis) present
Field personel
20140601
Percentage of Phragmites in marsh:
D = Dominant = Marsh 51-100% Phragmites
X = Present = Marsh 1-50% Phragmites
T = Trace = Marsh < 1% Phragmites
PrcntPhrag
PrcntPhrag
String
254
0
0
% cover of Phragmites in marsh
Field personel
20140601
% cover of Phragmites in marsh
FieldDate
FieldDate
Date
8
0
0
Date of marsh survey
Processor
20140601
Date of Marsh Survey
CommunType
CommunType
String
254
0
0
Community Type description
Tidal Marsh Inventories – Community Types & Field Codes
20140901
Type I: Predominately Saltmarsh Cordgrass / low marsh
Type II: Predominately Saltmeadow / high marsh
Type III: Predominately Black Needlerush
Type IV: Predominately Saltbush
Type V: Predominately Big Cordgrass
Type VI: Predominately Cattail
Type VII: Predominately Arrow Arum - Pickerelweed
Type VIII: Predominately Reed Grass
Type IX: Predominately Yellow Pond Lily
Type X: Predominately Saltwort
Type XI: Freshwater mix - no dominant species
Type XII: Brackish mix - no dominant specie
Type I: Predominantly Saltmarsh Cordgrass / low marsh
Marsh dominated by (>50% cover) saltmarsh cordgrass (Spartina alterniflora)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type II: Predominantly Saltmeadow / high marsh
Marsh dominated by (>50% cover) saltmeadow hay (Spartina patens) &/or saltgrass (Distichlis spicata)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type III: Predominantly Black Needlerush
Marsh dominated by (>50% cover) black needlerush (Juncus roemerianus)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type IV: Predominantly Saltbush
Marsh dominated by (>50% cover) groundsel tree (Baccharis halimifolia) &/or marsh elder (Iva frutescens)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type V: Predominantly Big Cordgrass
Marsh dominated by (>50% cover) big cordgrass (Spartina cynosuroides)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type VI: Predominantly Cattail
Marsh dominated by (>50% cover) cattails (Typha spp.)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type VII: Predominantly Arrow Arum - Pickerelweed
Marsh dominated by (>50% cover) arrow arum (Peltandra virginica) &/or pickerelweed (Pontederia cordata)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type VIII: Predominantly Reed Grass
Marsh dominated by (>50% cover) reed grass (Phragmites australis)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type IX: Predominantly Yellow Pond Lily
Marsh dominated by (50% cover) yellow pond lily (Nuphar luteum)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type X: Predominantly Saltwort
Marsh dominated by (>50% cover) saltwort (Salicornia spp.)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type XI: Freshwater mix - no dominant species
Marsh predominantly freshwater species, with no single species dominant (>50% cover)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Type XII: Brackish mix - no dominant species
Marsh predominantly brackish or salt water species, with no single species dominant (>50% cover)
Silberhorn, G.M., G.M. Dawes, T.A. Barnard, Jr.. 1974. Coastal Wetlands of Virginia. Interim Report No. 3. Guidelines for Activities Affecting Virginia Wetlands. Special Report in Applied Marine Science and Ocean Engineering No. 46. VIMS. Gloucester Pt, VA. 23062.
Dominant_P
Dominant_P
String
254
0
0
Dominant plant species
Processor
20140801
Dominant plant species
COUNTY
COUNTY
String
50
0
0
Jurisdiction represented in survey
Processor
Name of jurisdiction (city/county).
PubYear
PubYear
String
50
0
0
Publication year.
Processor
Publication years are 2011-2019
Acres
Acres
Double
8
0
0
Area of marsh polygon
Processor
Area of wetland polygon in acres (GIS calculated in UTM zone 18)
FieldCheck
FieldCheck
String
5
0
0
Indicated that a marsh has been verified in the field.
Processor
Y = field verified
N = not field checked
MarshNo
MarshNo
Double
8
0
0
Unique id for a marsh. The number is only unique within the city/county of the inventory.
Processor
Numberic identification number for a tidal marsh. Unique within the county surveyed.
FIPS
FIPS
Integer
4
0
0
"Federal Information Processing Standards (FIPS) codes are a standardized set of numeric codes to ensure uniform identification of geographic entities such as cities, counties and towns." These codes are issued by the National Institute of Standards and Technology (NIST). The codes listed in this field are county and city codes for Virginia (state FIPS 51).
Virginia Department of Taxation
FIPSCode
FIPSCode
String
10
0
0
"Federal Information Processing Standards (FIPS) codes are a standardized set of numeric codes to ensure uniform identification of geographic entities such as cities, counties and towns." These codes are issued by the National Institute of Standards and Technology (NIST). The codes listed in this field are county and city codes for Virginia (state FIPS 51). This field is the same as the FIPS field except represented as text.
processor
FIPSMRSHNO
FIPSMRSHNO
String
50
0
0
Unique identification for a marsh. It is a combination of the FIPS code and the marsh number.
processor
Comments
Comments
String
254
0
0
Comments pertaining to the tidal marsh.
processor
PrevPubYr
PrevPubYr
String
50
0
0
Previously published year.
processor
Shape_Leng
Shape_Leng
Double
8
0
0
Shape_Area
Shape_Area
Double
8
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated (when part of a geodatabase).
PhragPres
PhragPres
String
50
0
0
RefImagery
RefImagery
String
100
0
0
Imagery referenced while delineating tidal marsh polygons using onscreen digitizing techniques at a scale of 1:1,000.
processor
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ORIG_FID
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Shape_Length
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Length of feature in internal units.
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Five shape files combine to complete the Shoreline Inventory. The complete set includes va_lubc, va_astru, va_sstru, va_beaches, and va_TMI. The va_lubc (land use and bank cover) file is a linear shape file containing data about land use, tree fringe, bank height, bank cover, bank stability and beach status along the shoreline. Va_astru (access structure shape file) is a point shape file with locations of docks, dilapidated docks, boathouses, and private and public boat ramps. Va_sstru (shoreline structures) is a linear shape file delineating hard structures in place at the shoreline (bulkhead, dilapidated bulkhead, riprap, wharf, unconventional, debris, marina < 50 slips, marina > 50 slips, jetty, marsh toe revetment, groinfield and breakwaters). Va_beach is a linear shapefile showing the presence of beaches on the shoreline. As of 2016, beaches are digitized as a separate file and are no longer included in the _lubc shapefile. Va_TMI (tidal marsh inventory) shows the location, size, and community type of tidal marshes.
These shape files will be modified yearly with the addition of updated locality inventories. The PubYear field denotes the publication year of the county inventory. The jurisdiction is listed in the County field. Digital shoreline inventories began in 1998. Over the years, the methodology for collecting the data, as well as what data is collected has changed. For detailed information on a particular county, please visit the Shoreline & Tidal Marsh Inventory web site at https://www.vims.edu/ccrm/research/inventory/index.php.
Comprehensive Coastal Inventory Program, Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, Virginia, 23062.
dataset
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20230604