Metadata: Identification_Information: Citation: Citation_Information: Originator: Zafer Defne Originator: Neil K. Ganju Originator: Kate V. Ackerman Publication_Date: 20240712 Title: Lifespan of marsh units in Eastern Shore of Virginia salt marshes Edition: 1.0 Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon) Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P14GBAVB Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program Other_Citation_Details: Suggested citation: Defne, Z., Ganju, N.K., and Ackerman, K.V., 2024, Lifespan of marsh units in Eastern Shore of Virginia salt marshes: U.S. Geological Survey data release, https://doi.org/10.5066/P14GBAVB. Online_Linkage: https://doi.org/10.5066/P14GBAVB Online_Linkage: https://www.sciencebase.gov/catalog/item/664c9cbdd34e1955f5a4f45f Description: Abstract: The lifespans of salt marshes in Atlantic-facing Eastern Shore of Virginia are calculated based on estimated sediment supply and sea-level rise (SLR) predictions, following the methodology of Ganju and others (2020). The salt marsh delineations are from Ackerman and others (2023). The SLR predictions are local estimates corresponding to increases of 0.3, 0.5 and 1.0 meter in global mean sea level (GMSL) by 2100, as projected by Sweet and others (2022). This work has been a part of the USGS’s effort to expand the national assessment of coastal change hazards and forecast products to coastal wetlands. The aim is to equip federal, state and local managers with tools to estimate the vulnerability and ecosystem service potential of these wetlands. For this purpose, the response and resilience of coastal wetlands to physical factors need to be assessed in terms of the ensuing change to their vulnerability and ecosystem services. (The data release containing lifespan estimates for the Chesapeake Bay-facing portion of the Eastern Shore of Virginia is found here: https://doi.org/10.5066/P9FSPWSF.) Purpose: The purpose of this shapefile is to present lifespan estimates, based on three different SLR estimates (Sweet and others, 2022), for each salt marsh unit in the Eastern Shore of Virginia as defined by the USGS (Ackerman and others, 2023). Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2024 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -75.9777 East_Bounding_Coordinate: -75.4740 North_Bounding_Coordinate: 37.8818 South_Bounding_Coordinate: 37.0854 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: inlandWaters Theme_Keyword: environment Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: geospatial datasets Theme_Keyword: wetland ecosystems Theme_Keyword: wetland functions Theme_Keyword: coastal ecosystems Theme_Keyword: coastal processes Theme_Keyword: sea-level change Theme_Keyword: sediment transport Theme_Keyword: estuarine processes Theme_Keyword: vegetation Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: salt marsh Theme_Keyword: marsh health Theme_Keyword: lifespan Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Theme_Keyword: estuary Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:664c9cbdd34e1955f5a4f45f Place: Place_Keyword_Thesaurus: None Place_Keyword: United States Place_Keyword: Atlantic Ocean Place_Keyword: Virginia Place_Keyword: Wallops Island Place_Keyword: Chincoteague National Wildlife Refuge Place_Keyword: Metompkin Island Place_Keyword: Cedar Island Place_Keyword: Parramore Island Place_Keyword: Hog Island Place_Keyword: Mockhorn Island Place_Keyword: Smith Island Place_Keyword: Fisherman Island National Wildlife Refuge Place_Keyword: Eastern Shore National Wildlife Refuge Place_Keyword: Virginia Coast Reserve Access_Constraints: None Use_Constraints: The lifespan estimate for each marsh unit is defined for scientific research purposes and should not be used as a sole source of reference for any regulations and policy making. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the source of this information. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Zafer Defne Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-548-8700 x2254 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: zdefne@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/664c9cbdd34e1955f5a4f45f/?name=mu_lifespan_ESV.png&allowOpen=true Browse_Graphic_File_Description: Graphic of shapefile showing lifespan estimates for Eastern Shore of Virginia salt marshes. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft Windows 10 Version 0.1 (Build 19042); Esri ArcGIS Pro 3.2.2 Cross_Reference: Citation_Information: Originator: N.K. Ganju Originator: Z. Defne Originator: S. Fagherazzi Publication_Date: 2020 Title: Are elevation and open-water conversion of salt marshes connected? Geospatial_Data_Presentation_Form: publication Series_Information: Series_Name: Geophysical Research Letters Issue_Identification: v. 47, issue 3 Online_Linkage: https://doi.org/10.1029/2019GL086703 Cross_Reference: Citation_Information: Originator: J.T. Morris Originator: D.C. Barber Originator: J.C. Callaway Originator: R. Chambers Originator: S.C. Hagen Originator: C.S. Hopkinson Originator: B.J. Johnson Originator: P. Megonigal Originator: S.C. Neubauer Originator: T. Troxler Originator: C. Wigand Publication_Date: 2016 Title: Contributions of organic and inorganic matter to sediment volume and accretion in tidal wetlands at steady state Geospatial_Data_Presentation_Form: publication Series_Information: Series_Name: Earth’s Future Issue_Identification: v. 4, issue 4 Online_Linkage: https://doi.org/10.1002/2015EF000334 Cross_Reference: Citation_Information: Originator: W.V. Sweet Originator: B.D. Hamlington Originator: R.E. Kopp Originator: C.P. Weaver Originator: P.L. Barnard Originator: D. Bekaert Originator: W. Brooks Originator: M. Craghan Originator: G. Dusek Originator: T. Frederikse Originator: G. Garner Originator: A.S. Genz Originator: J.P. Krasting Originator: E. Larour Originator: D. Marcy Originator: J.J. Marra Originator: J. Obeysekera Originator: M. Osler Originator: M. Pendleton Originator: D. Roman Originator: L. Schmied Originator: W. Veatch Originator: K.D. White Originator: C. Zuzak Publication_Date: 2022 Title: Global and Regional Sea Level Rise Scenarios for the United States: Updated Mean Projections and Extreme Water Level Probabilities Along U.S. Coastlines Edition: 1.0 Publication_Information: Publication_Place: Silver Spring, MD Publisher: NOAA Online_Linkage: https://oceanservice.noaa.gov/hazards/sealevelrise/sealevelrise-tech-report-sections.html Cross_Reference: Citation_Information: Originator: Kate V. Ackerman Originator: Zafer Defne Originator: Neil K. Ganju Publication_Date: 2023 Title: Conceptual marsh units of salt marshes on the Eastern Shore of Virginia in Geospatial characterization of salt marshes on the Eastern Shore of Virginia Edition: 1.0 Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon) Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9E6V0QK Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: The first link is to the data release, the second to the specific dataset referenced in the abstract. Online_Linkage: https://doi.org/10.5066/P9E6V0QK Online_Linkage: https://www.sciencebase.gov/catalog/item/63e53a36d34efa0476ade047 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Marsh units, and water and land boundaries inherit their horizontal accuracy from accuracy of the source data, Eastern Shore of Virginia marsh units. The vertical accuracy of the marsh unit elevation is inherited from the 1-meter resolution 2015 USGS Lidar digital elevation model (DEM). The uncertainty in the lifespan estimates is large because of the nature of the empirical equations used and the uncertainty in the source data. For example, a 20% variation in each of the unvegetated to vegetated marsh ratio (UVVR), elevation, bulk density and sea-level rise variables, when all in favor of reducing lifespan, may result in a combined reduction of 50% in lifespan estimate. Logical_Consistency_Report: Negative lifespan indicates the estimated lifespan is depleted and loss is imminent. Some flagged units (see description for the FLG variable) are assigned a lifespan estimate of -9999. Completeness_Report: The results are specific to the marsh units within the boundaries of the Eastern Shore of Virginia salt marsh system. A detailed on-the-ground analysis of a single site may result in a different interpretation of the wetland and marsh unit boundaries. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal accuracy is inherited from the source dataset (Conceptual marsh units of salt marshes on the Eastern Shore of Virginia) that delineates the marsh units, and can be considered to be +/-6 meters. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Because the elevation values are averaged over delineated polygons, vertical accuracy of marsh unit elevation depends on both the horizontal accuracy of National Wetlands Inventory (NWI) dataset and the vertical accuracy of source elevation data (1-meter 2015 USGS Lidar DEM). The 1-meter 2015 USGS Lidar DEM vertical elevation accuracy was reported to be 0.06 meters. No additional accuracy assessment of the vertical accuracy has been conducted. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Kate V. Ackerman Originator: Zafer Defne Originator: Neil K. Ganju Publication_Date: 2023 Title: Geospatial characterization of salt marshes on the Eastern Shore of Virginia Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon) Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9E6V0QK Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9E6V0QK Online_Linkage: https://www.sciencebase.gov/catalog/item/63e53993d34efa0476ade042 Online_Linkage: https://www.sciencebase.gov/catalog/item/63e53aced34efa0476ade04c Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2023 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: mu_elev_ESV; mu_UVVR_ESV Source_Contribution: From the elevation dataset (online link 2), we used the marsh unit elevation (MU_ELEV) and vegetated fraction elevation (VG_ELEV) as inputs. From the unvegetated to vegetated ratio (UVVR) dataset (online link 3), we used the UVVR as input. Projection was WGS 1984 Web Mercator Auxiliary Sphere. Data was downloaded 02/15/2024. Process_Step: Process_Description: This process step was performed by Kate Ackerman, using ArcGIS Pro (ver. 3.2.2). In this and all process steps, for simple operations the name of the geoprocessing tool used is given in capital letters; for complex operations, the name of the geoprocessing tool used is given in capital letters and any critical parameters used are given in parentheses, separated by a semicolon, immediately after the tool name. The input and output file names are provided in [square brackets] when necessary. Units for length and area calculations are meters (m) and square meters (m^2) unless otherwise stated. Merge input datasets. a) Download elevation (mu_elev_ESV.shp) and unvegetated to vegetated marsh ratio (UVVR) (mu_UVVR_ESV.shp) layers from the publications that cover the salt marshes of Eastern Shore of Virginia. b) JOIN the elevation and UVVR datasets to create one shapefile with both datasets in it. c) Convert the coordinate system from Web Mercator to the North American Datum of 1983 (NAD 1983) geographic coordinate system and add the coordinates for polygon centroids (X_POINT, Y_POINT) in decimal degrees to the data table using CALCULATE_GEOMETRY_ATTRIBUTES tool. d) Export the following variables to a comma separated values file [ESV_mu.csv]: X_POINT, Y_POINT, FID_CMU, UVVR, ATOT_M2, AVEG_M2, mu_ELEV, vg_ELEV, FLG. Source_Used_Citation_Abbreviation: mu_elev_ESV Source_Used_Citation_Abbreviation: mu_UVVR_ESV Process_Date: 2024 Source_Produced_Citation_Abbreviation: ESV_mu.csv Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Kate Ackerman Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-548-8700 x2331 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: kackerman@usgs.gov Process_Step: Process_Description: This processing steps was performed by Zafer Defne using VDatum online (VDatum ver. 4.6.1) and Matlab (ver. 2021b). Convert datums and calculate lifespan. a) Convert marsh unit elevations from the North American Vertical Datum of 1988 (NAVD88) to Mean Tide Level (MTL) referenced elevations. Input the ASCII file of latitude and longitude coordinates and elevation from ESV dataset (ESV_mu.csv) to VDatum software, and transform vertical datum from the NAVD88 to MTL. Do this for the marsh unit elevation (MU_ELEV) and elevation of the vegetated part of the marsh unit (VG_ELEV) to calculate MU_ELEV_MTL and VG_ELEV_MTL, respectively. Use value from the nearest Vdatum point for any point where VDatum has no data. b) Calculate sediment budget from UVVR based on Ganju and others (2020) with SB=-0.416*log(UVVR)-1.0749, where SB is sediment budget in kilograms per square meter per year, and log() indicates natural logarithm function. c) Calculate total sediment flux under background relative SLR (BGRND) with SF=SB*ATOT_M2, where SF is sediment flux in kilograms per year and ATOT_M2 is total surface area of marsh unit in square meters. d) Calculate total sediment flux under global mean sea level (GMSL) scenarios (for example, GMSL03 scenario means GMSL rise of 0.3 meters). SLR reduces vegetated marsh area, therefore, causes reduction in sediment flux. The sediment flux under SLR is calculated with SF_SLR=(SB-SLR_RATE*RHO_F)*ATOT_M2, where SF_SLR is sediment flux under SLR, RHO_F is dry bulk density of future deposited sediment. RHO_F was assigned 159 kilograms per cubic meters from Morris and others (2016). SLR_RATE is the SLR rate, calculated as SLR_RATE=(RSL2100+RSL_OFFSET)/100-RSL_VLM, where RSL2100 is the relative sea level by 2100 under a global mean sea level rise scenario, RSL_OFFSET is the offset to initiate the projection at year 2000, and RSL_VLM is the relative sea level contribution from vertical land motion. For sea level rise projections, Sweet and others (2022) SLR data within the region were used. A total of 14 points including 7 stations and 7 grid points were within the bounding box with lower left corner of (-76.4647N, 36.8217W) and upper right corner of (-73.0000N, 38.3267W). Interpolate the SLR_RATE from 14 points over a regular grid using GRIDDATA function with natural neighbor interpolation (grid size 35 longitudinal by 15 latitudinal points). Assign to each marsh unit the interpolated SLR_RATE value from the nearest grid point. Do this for the three scenarios considered: GMSL rise of 0.3 meters, 0.5 meters and 1.0 meters by year 2100 and calculate sediment flux for each of them. e) Total sediment mass in the vegetated plain above MTL is calculated with TS=vg_ELEV_MTL*AVEG_M2*RHO_E, where TS is total sediment mass, AVEG_M2 is the surface area of the vegetated part of the marsh unit and RHO_E is the dry bulk density of existing marsh substrate sediment. RHO_E was assigned 373 kilograms per cubic meters from Morris and others (2016). f) Calculate lifespan (in years) for the background relative SLR with the equation BGRND= -TS/SF. Calculate lifespan (in years) for global mean sea level rise by 0.3 meters, 0.5 meters and 1.0 meters by year 2100 scenarios with the equation GMSL= -TS/SF_SLR for each scenario (GMSL03, GMSL05, GMSL10, respectively). g) Output Matlab data as a comma separated text file [ESV_lifespan.csv]. Source_Used_Citation_Abbreviation: ESV_mu.csv Process_Date: 2024 Source_Produced_Citation_Abbreviation: ESV_lifespan.csv Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Zafer Defne Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-548-8700 x2254 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: zdefne@usgs.gov Process_Step: Process_Description: This processing step was performed by Zafer Defne using ArcGIS Pro (ver. 3.2.2). Finalize the feature dataset and change projection. a) JOIN lifespan calculation results file [ESV_lifespan.csv] with the marsh unit features using ADD_JOIN and join field as FID_CMU. b) For marshes that are more stable, lifespan calculation sometimes results in large numbers that are far beyond the lifespan horizon of interest. Also, positive sediment budget implies unlimited lifespan. For these units, set the maximum lifespan value to 10,000 years. c) Set lifespan values to -9999 for units with no vegetated area or with missing elevation values (FLG values that contain any of -1 or -200 values in them) so that they can be labeled as not available or excluded while plotting the data. d) Set legend label for lifespan values less than 0 as imminent. e) Rearrange field names and change the projection for better performance of web services with online base maps. PROJECT(Input coordinate system= NAD 1983 Geographic coordinate system; Output coordinate system=WGS 1984 Web Mercator Auxiliary Sphere; Geographic transformation= WGS 1984 (ITRF00) to NAD 1983) the feature dataset to obtain the lifespan values [mu_lifespan_ESV.shp]. Source_Used_Citation_Abbreviation: ESV_lifespan.csv Process_Date: 2024 Source_Produced_Citation_Abbreviation: mu_lifespan_ESV.shp Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 6358 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: WGS 1984 Web Mercator Auxiliary Sphere (Esri Full Name: WGS_1984_Web_Mercator_Auxiliary_Sphere) Mercator: Standard_Parallel: 0.0 Longitude_of_Central_Meridian: 0.0 False_Easting: 0.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.6096 Ordinate_Resolution: 0.6096 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: mu_lifespan_ESV.shp Attribute Table Entity_Type_Definition: Attribute information associated with the lifespan estimates for the conceptual marsh units of Eastern Shore of Virginia salt marsh system. Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Feature geometry. Marsh units are polygon features. Attribute: Attribute_Label: FID_CMU Attribute_Definition: Sequential unique whole number that represents the identification number for each conceptual marsh unit. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 6357 Attribute_Units_of_Measure: none Attribute: Attribute_Label: ATOT_M2 Attribute_Definition: Total surface area of a marsh unit in square meters. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 123.826608 Range_Domain_Maximum: 1906442.13071 Attribute_Units_of_Measure: square meter Attribute: Attribute_Label: AVEG_M2 Attribute_Definition: Surface area of vegetated part of a marsh unit in square meters. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.0 Range_Domain_Maximum: 1628088.8009 Attribute_Units_of_Measure: square meter Attribute: Attribute_Label: MU_ELEV Attribute_Definition: Mean elevation of a marsh unit in meters referenced to NAVD88. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.892 Range_Domain_Maximum: 2.135 Attribute_Units_of_Measure: meter Attribute: Attribute_Label: MU_ELEVMTL Attribute_Definition: Mean elevation of a marsh unit in meters referenced to mean tide level (MTL). Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.749 Range_Domain_Maximum: 2.307 Attribute_Units_of_Measure: meter Attribute: Attribute_Label: VG_ELEV Attribute_Definition: Mean elevation of the vegetated area in a marsh unit in meters referenced to NAVD88. Value is set to -9999 if there is no vegetated area in the marsh unit. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.39 Range_Domain_Maximum: 2.065 Attribute_Units_of_Measure: meter Attribute: Attribute_Label: VG_ELEVMTL Attribute_Definition: Mean elevation of the vegetated area in a marsh unit in meters referenced to MTL. Value is set to -9999 if there is no vegetated area in the marsh unit. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.377 Range_Domain_Maximum: 2.237 Attribute_Units_of_Measure: meter Attribute: Attribute_Label: UVVR Attribute_Definition: Ratio of unvegetated surface area to vegetated surface area. Ordinarily, UVVR ranges from zero (completely vegetated) to infinity (completely unvegetated). However, it is assigned the value of -1 when completely unvegetated. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.0 Range_Domain_Maximum: 1155922.809 Attribute_Units_of_Measure: none Attribute: Attribute_Label: BGRND Attribute_Definition: Lifespan for a marsh unit (in years) for nonclimatic background relative sea level rise. Negative lifespan (other than No Data) indicates the estimated lifespan is depleted and loss is imminent. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 10000 Enumerated_Domain_Value_Definition: Value larger than or equal to 10000 Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -33 Range_Domain_Maximum: 10000 Attribute_Units_of_Measure: year Attribute: Attribute_Label: GMSL03 Attribute_Definition: Lifespan for a marsh unit (in years) for global mean sea level rise of 0.3 meters by 2100. Negative lifespan (other than No Data) indicates the estimated lifespan is depleted and loss is imminent. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 10000 Enumerated_Domain_Value_Definition: Value larger than or equal to 10000 Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -14 Range_Domain_Maximum: 10000 Attribute_Units_of_Measure: year Attribute: Attribute_Label: GMSL05 Attribute_Definition: Lifespan for a marsh unit (in years) for global mean sea level rise of 0.5 meters by 2100. Negative lifespan (other than No Data) indicates the estimated lifespan is depleted and loss is imminent. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 10000 Enumerated_Domain_Value_Definition: Value larger than or equal to 10000 Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -11 Range_Domain_Maximum: 10000 Attribute_Units_of_Measure: year Attribute: Attribute_Label: GMSL10 Attribute_Definition: Lifespan for a marsh unit (in years) for global mean sea level rise of 1.0 meters by 2100. Negative lifespan (other than No Data) indicates the estimated lifespan is depleted and loss is imminent. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: -9999 Enumerated_Domain_Value_Definition: No Data Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 10000 Enumerated_Domain_Value_Definition: Value larger than or equal to 10000 Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -7 Range_Domain_Maximum: 10000 Attribute_Units_of_Measure: year Attribute: Attribute_Label: FLG Attribute_Definition: Marsh unit flag indicating anomalous marsh units based on absence of vegetation, elevation, surface area and tidal range extrapolation. FLG values indicate: (-1) no vegetated area in the marsh unit; (-10) marsh unit elevation higher than the 99.8 percentile; (-100) marsh unit elevation less than the 0.2 percentile; (-200) greater than 25 percent of the marsh unit elevation is hydro-flattened; (-1000) marsh unit surface area less than 900 m^2; (-10000) mean tidal range of marsh unit is extrapolated; and (0) no flag. Combination of negative values indicates a combination of flags. For example, -1001 indicates no vegetated area and area less than 900 m^2. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -11100 Range_Domain_Maximum: 0 Attribute_Units_of_Measure: None Overview_Description: Entity_and_Attribute_Overview: In this dataset, lifespan estimates for each conceptual salt marsh unit in the Eastern Shore of Virginia salt marsh system have been calculated based on the 1-meter resolution raster source dataset. Decimal values in the attribute table are a result of double precision calculations while significant digits are considered in defining the attribute measurement resolutions. Therefore, the smallest unit increment for area values and elevation is assumed to be 1 meter and 0.01, respectively. Entity_and_Attribute_Detail_Citation: USGS Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: The dataset contains polygon marsh unit lifespan data (mu_lifespan_ESV.shp and other shapefile components), browse graphic, and the FGDC CSDGM metadata in .xml format. Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Not for navigational use. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile Format_Version_Number: ArcGIS Pro 3.2.2 Format_Information_Content: This zipped file contains a polygon shapefile and its components, a style layer descriptor file, metadata in xml format and a browse image. Transfer_Size: 31 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/664c9cbdd34e1955f5a4f45f Network_Resource_Name: https://doi.org/10.5066/P14GBAVB Access_Instructions: The first link in network resources is to download data directly. The second link points to a landing page with metadata and data. Digital_Form: Digital_Transfer_Information: Format_Name: WMS Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalogMaps/mapping/ows/664c9cbdd34e1955f5a4f45f?service=wms&request=getcapabilities&version=1.3.0 Access_Instructions: The link in network resources points to the Web Mapping Services (WMS) end point. Digital_Form: Digital_Transfer_Information: Format_Name: WFS Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalogMaps/mapping/ows/664c9cbdd34e1955f5a4f45f?service=wfs&request=getcapabilities&version=1.0.0 Access_Instructions: The link in network resources points to the Web Feature Service (WFS) end point. Fees: None. No fees are applicable for obtaining the data set. Metadata_Reference_Information: Metadata_Date: 20240712 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Zafer Defne Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-548-8700 x2254 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the person is no longer with USGS. Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998