20250919 13333800 1.0 FGDC CSDGM Metadata FALSE VA_Combined_TidalMarsh_2024_2026 0.000 284430.282400 478157.245400 4045343.903500 4307022.121800 1 002 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) NAD_1983_UTM_Zone_18N <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.5.0'><WKT>PROJCS[&quot;NAD_1983_UTM_Zone_18N&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Transverse_Mercator&quot;],PARAMETER[&quot;False_Easting&quot;,500000.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-75.0],PARAMETER[&quot;Scale_Factor&quot;,0.9996],PARAMETER[&quot;Latitude_Of_Origin&quot;,0.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,26918]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>-9998100</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>26918</WKID><LatestWKID>26918</LatestWKID></ProjectedCoordinateSystem> 20250919 10521100 20250919 13305100 ISO19115_3 150000000 5000 Shapefile File Geodatabase Feature Class https://www.vims.edu/ccrm/research/inventory/virginia/index.php 0.000 Virginia Tidal Marsh Inventory 2024 - 2025 2014-12-31T00:00:00 2025-09-19T00:00:00 Nunez, Karinna; Rudnicky, Tamia; Killeen, Sharon; Hendricks, Jessica; Duning, Catherine R.; Hill, Evan; and Graulich, Jack, "Virginia Tidal Marsh Inventory 2024-2025" (2025). Data. Center for Coastal Resources Management Virginia Institute of Marine Science, P.O. Box 1346, 1375 Greate Rd Gloucester Point Virginia 23062 US Catherine Riscassi Duning Center for Coastal Resources Management GIS Analyst ground condition 2009-06-01T00:00:00 2025-08-29T00:00:00 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 in Virginia using data collected in the early 1970's. In 2010, a new iteration of the Virginia Tidal Marsh Inventory began using high-resolution color imagery from the Virginia Base Map Program (VBMP) (2009, 2011, 2013, and 2017). 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>In 2023, a third iteration of the Virginia Tidal Marsh Inventory began in conjunction with the shoreline inventory update. This latest phase employs advanced remote sensing techniques, utilizing the most recent VBMP imagery and ESRI ArcGIS Pro software to map marsh boundaries (updated marsh extent and distribution). While historical plant community data was retained for existing marshes, newly identified marshes were initially classified as having an "undetermined" plant community type. This classification was only updated if high-resolution aerial imagery or drone-based photography provided conclusive evidence of the specific plant communities present.</SPAN></P></DIV></DIV></DIV> Tidal Marsh Inventory Virginia Gloucester Hampton Lancaster Mathews Middlesex Northumberland Poquoson Virginia Beach Westmoreland York Virginia, Gloucester, Hampton, Lancaster, Mathews, Middlesex, Northumberland, Poquoson, Virginia Beach, Westmoreland, York Tidal marsh, wetland plant identification, wetland community type <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 6 0;"><SPAN>The Center for Coastal Resources Management (CCRM) provides these data with the understanding that it is 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. Neither CCRM nor the Virginia Institute of Marine Science (VIMS) assume liability for any damages caused by inaccuracies in the data or documentation or as a result of failure of the data to perform in a particular manner. CCRM, VIMS, and the Commonwealth 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.</SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN /></P><P STYLE="margin:0 0 6 0;"><SPAN>VIMS CCRM must be cited with any use of this data. See Citation section of metadata for appropriate citation.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> For more information please visit https://www.vims.edu/ccrm/research/inventory/Virginia/ 1 -77.485332 -75.244070 38.911827 36.529198 Karinna Nunez Virginia Institute of Marine Science P.O. Box 1346 Gloucester Point Virginia 23062 karinna@vims.edu US (804) 684-7273 Geospatial Modeling Manager This project has been funded wholly or in part by The Virginia Department of Environmental Quality, Virginia Coastal Zone Management Program Grant # NA23NOS4190255. 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 The tidal marsh inventory (TMI, 2009-20018), was a 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. The results of the field surveying and identification of the marsh plant community types, is carried forward to the next iteration of TMI. The next iteration (2023-2026) of Virginia Shoreline inventory included an update of tidal marsh inventory. Marsh was identified remotely using 2021 Virginia Base Mapping Program (VBMP) imagery at a scale of 1:1000 as a backdrop , and using ArcGIS Pro 3.1 and above. Using this as a baseline, the TMI was also identified referencing Google Earth Historical Imagery years 2021-2024. . In order to preserve the the previous TMI that was field verified, the data was mapped to the new tidal marsh polygons where they geometrically intersected. New tidal marsh polygons were labeled as "undetermined" plant community types unless they could be identified by field personnel. Starting in 2023, Tidal marsh was identified remotely primarily using VBMP 2021 imagery and referencing Google Earth Historical Imagery years 2021-2024. New marsh that was not previously part of the TMI, were given the designation of a plant community type of 'undetermined' and were reviewed by field personnel for possible identification. If identified, the SurveyType field would indicate if it was a 'remote' or 'field' identification. The data was processed using ArcGIS Pro version 3.2 or above. The improvement in high resolution imagery in both the Virginia Base Mapping Program and Google Earth, made it possible to identify geometry of marshes without field verification. However it does not allow for identification of plant community types. Marsh field experts were allowed to view imagery and if possible, identify plant community types. The data will reflect those marshes that were identified remotely. 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 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 Marsh inventories published in 2024 and 2025 were appended and edge-matched. 2025-09-19T00:00:00 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. Marshes that were identified in the next iteration of the inventory (2023-2026) were done remotely, primary through VBMP 2021 basemap imagery. Newly identified marshes were given a plant community type as "undetermined" unless they could be identified using imagery by field personnel. Marshes that were identified in the previous TMI, were given the same plant community type in the new TMI when they intersected the same geographic location. Polygons do not self intersect. Topology has been validated. There are no overlapping polygons, however, there may be small gaps between polygons. 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_Combined_TidalMarsh_2024_2025 Feature Class 0 Virginia tidal marshes processor OBJECTID OBJECTID OID 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. County County String 254 0 0 County name CCRM RefImagery RefImagery String 254 0 0 Imagery referenced while delineating tidal marsh polygons using onscreen digitizing techniques at a scale of 1:1,000. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Reedgrass Reedgrass String 254 0 0 Amount of Reedgrass (Phragmites australis) present. Phragmites australis is an invasive wetland plant known to thrive in areas that have experienced disturbance. Common names include common reed and reed grass. Phragmites is mapped in two ways: as a tidal marsh community type where it is dominant (>50% cover) and also where it appears in mapped tidal marshes in any amount. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 D Dominant = marsh is 51-100% Phragmites PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM X Present = Marsh 1 - 50% Phragmites PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM T Trace = marsh < 1% phragmites PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM PrcntPhrag PrcntPhrag String 254 0 0 Percent Phragmites present in the marsh Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 0 100 CommunType CommunType String 254 0 0 Majority (>50%) of the plant community type in the marsh. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Saltmarsh Cordgrass / low marsh Marsh dominated by (>50% cover) saltmarsh cordgrass (Spartina alterniflora). Ranges from mean sea level to approximately mean high water. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Saltmeadow / high marsh Marsh dominated by (>50% cover) saltmeadow hay (Spartina patens) &/or saltgrass (Distichlis spicata). Found at about mean high tide to the limit of spring tides; saltgrass at lower elevations, saltmeadow hay predominates at the higher end of the range. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Black Needlerush Marsh dominated by (>50% cover) black needlerush (Juncus roemerianus). Found at about mean high water to somewhat below spring tide limit. Seems to prefer sandy substratum. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Saltbush Marsh dominated by (>50% cover) groundsel tree (Baccharis halimifolia) &/or marsh elder (Iva frutescens). Lower limit is approximately the upper limit of marsh (marsh-upland ecotone). Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Big Cordgrass Marsh dominated by (>50% cover) big cordgrass (Spartina cynosuroides). Found at or slightly above mean high water and extending to the upland margin. Most common in brackish or low salinity marshes. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Cattail Marsh dominated by (>50% cover) cattails (Typha spp.). Located at very wet sites, sometimes in standing water, often at the margin of marsh and uplands. Does well in seepage areas resulting from upland runoff. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Arrow Arum – Pickerelweed Marsh dominated by (>50% cover) arrow arum (Peltandra virginica) &/or pickerelweed (Pontederia cordata). Found on tidal mud flats from mean sea level to about mean high tide in low salinity or freshwater marshes. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Reed Grass Marsh dominated by (>50% cover) reed grass (Phragmites australis). Usually located above mean high tide, drier areas on disturbed sites. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Yellow Pond Lily Marsh dominated by (50% cover) yellow pond lily (Nuphar luteum). Primarily submerged except for floating leaves at high tide. Found in freshwater areas Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Saltwort Marsh dominated by (>50% cover) saltwort (Salicornia spp.). Located above means high tide in pannes or sparsely vegetated areas. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Freshwater Mix Marsh predominantly freshwater species, with no single species dominant (>50% cover). Located from submerged to the upper limits of the wetlands. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Brackish Mix Marsh predominantly brackish or saltwater species, with no single species dominant (>50% cover). Location extends from about mean sea level to the upland margin. Silberhorn, G. M., Dawes, G. M., & Barnard, T. A. (1974) Coastal Wetlands of Virginia Interim Report No. 3: Guidelines for Activities Affecting Virginia Wetlands. Special Reports in Applied Marine Science and Ocean Engineering (SRAMSOE) No. 46. Virginia Institute of Marine Science, William & Mary. https://doi.org/10.21220/V5PX65 Dominant_P Dominant_P String 254 0 0 Dominant plant species in the marsh. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 PubYear PubYear String 50 0 0 Year the inventory was published PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM PhragPres PhragPres String 50 0 0 If phragmites australis is present, this will indicate the percent present (< 50%, >=50%). PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM <50% If the percent of phragmites australis in the marsh is less than 50%. PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM >=50% If the percent of phragmites australis in the marsh is greater or equal to 50%. PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM SurveyType SurveyType String 15 0 0 If the marsh was updated in 2024 or later (PlantUpdt = 'Y'), this indicates how the marsh was identified CCRM Field The marsh was identified in the field Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Remote The marsh was identified remotely using imagery. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 USsrvyAcre USsrvyAcre Double 8 0 0 Area of wetland polygon in US Survey acres (GIS calculated in UTM zone 18) PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM Shape_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. PlantUpdt PlantUpdt String 5 0 0 'Y' or null: This field will indicate if an undetermined marsh plant community type was updated in 2024 or later. If this value is 'Y' then the SurveyType field will also have a value that indicates how the marsh was identified. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 MMS_Status MMS_Status String 5 0 0 MapMyShore (MMS) is an application that allows the community to assist VIMS with collecting and ground-truthing shoreline inventory features critical to natural and cultural resources. Additions or updates to the inventory that come from MMS are noted in this field. Null values indicate the feature was not reported in MMS. For more information on MMS, visit https://www.vims.edu/ccrm/research/inventory/virginia/map-my-shore/ PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM N a new feature that was submitted in a MMS survey and was not part of the inventory previously. PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM C feature existed within the inventory and presence was confirmed by MMS survey. PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM U the feature existed in the inventory but was updated with new information (and photos) that changed the feature's attributes. PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM MMS_Date MMS_Date Date 8 0 0 indicates the date of when a MMS feature was added to the inventory. PROTOCOL_2024 - Shoreline and Tidal Marsh Inventory, VIMS CCRM Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. MarshMorph MarshMorph String 254 0 0 Tidal marshes take on several different morphologies which are dependent on location and size. When non-marsh attributes (forest, scrub shrub and water) and within a marsh they are coded as such but not part of the tidal marsh. This replaces the MarshType field which was discontinued in 2015. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Marsh Island A vegetated wetland that is completely isolated from the mainland boarded by open water. A marsh that is surrounded by water due to dissection from small tidal creeks was classified as marsh, not a marsh island. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Extensive Marshes with features that extend into the open water and have water on two or three sides. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Embayed Marshes with features that are set into the landscape with upland areas along the marsh edges. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Fringe Fringe marshes grow nearly parallel to the shoreline and can be wide or narrow. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 Water Areas of water within a tidal marsh. No marsh is present. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 NoMarsh_Forest Area of trees found within a tidal marsh that are not tidal emergent marsh. May be upland, tidal swamp, or nontidal swamp. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 NoMarsh_ScrubShrub Areas of scrub-shrub vegetation found within a tidal emergent marsh. May be upland, tidal swamp, or nontidal swamp Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 NoMarsh_Sand Sand on top of or in the marsh. May or may not continue to be marsh in the future. Not counted as marsh for current survey. Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS 2024 This polygon feature class that shows the location, size, and community type of tidal marshes within this locality. In 2023, the update of tidal marsh inventory update began in conjunction with the shoreline inventory update. Marsh boundaries (updated marsh extent and distribution) were identified and mapped remotely using high-resolution color imagery from the Virginia Base Map Program (VBMP). Plant community types and other historical data from the previous inventory were maintained for marshes that intersected the same geographic location. New marshes were initially classified as having an "undetermined" plant community type. This classification was only updated if high-resolution aerial imagery or drone-based photography provided conclusive evidence of the specific plant communities present. 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/virginia Center for Coastal Resources Management, Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, Virginia, 23062. dataset 0 Simple FALSE 0 TRUE TRUE 20250919 Catherine Riscassi Duning Comprehensive Coastal Inventory Program, Virginia Institute of Marine Science (VIMS)) GIS Analyst Catherine Riscassi Duning Virginia Institute of Marine Science Gloucester Point Virginia 23062 US