Metadata: Identification_Information: Citation: Citation_Information: Originator: Robert Welk Originator: Kate V. Ackerman Originator: Zafer Defne Originator: Neil Ganju Publication_Date: 20200331 Title: Elevation of marsh units in eastern Long Island salt marsh complex, New York (ver. 2.0, March 2024) Edition: 2.0 Geospatial_Data_Presentation_Form: Vector Digital dataset (Polygon) Series_Information: Series_Name: data release Issue_Identification: 10.5066/P91H426U Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: https://doi.org/10.5066/P91H426U Online_Linkage: https://www.sciencebase.gov/catalog/item/5ddd7472e4b04a30051ac165 Larger_Work_Citation: Citation_Information: Originator: Robert Welk Originator: Kate V. Ackerman Originator: Zafer Defne Originator: Neil Ganju Publication_Date: 2020 Title: Coastal wetlands of eastern Long Island, New York Edition: 2.0 Series_Information: Series_Name: data release Issue_Identification: 10.5066/P91H426U Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Welk, R., Ackerman, K.V., Defne, Z., and Ganju, N.K., 2020, Coastal wetlands of eastern Long Island, New York (ver. 2.0, March 2024): U.S. Geological Survey data release,https://doi.org/10.5066/P91H426U. Online_Linkage: https://doi.org/10.5066/P91H426U Online_Linkage: https://www.sciencebase.gov/catalog/item/5dd56511e4b0695797628ca6 Description: Abstract: This data release contains coastal wetland synthesis products for the geographic region of eastern Long Island, New York, including the north and south forks, Gardiners Island, and Fishers Island. Metrics for resiliency, including unvegetated to vegetated ratio (UVVR), marsh elevation, and mean tidal range, are calculated for smaller units delineated from a Digital Elevation Model, providing the spatial variability of physical factors that influence wetland health. Through scientific efforts initiated with the Hurricane Sandy Science Plan, the U.S. Geological Survey has been expanding national assessment of coastal change hazards and forecast products to coastal wetlands with the intent of providing 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. Purpose: The purpose of this shapefile is to calculate the mean elevation for each marsh unit and its vegetated component. Analysis of marsh elevation is part of a comprehensive assessment to identify the factors and their weights in determining the vulnerability and resiliency of salt marshes. Elevation distribution in the eastern Long Island salt marsh complex is given in terms of mean elevation of conceptual marsh units. The elevation data is based on the 1-meter resolution National Elevation Database (NED). Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Currentness_Reference: Publication date of original release. Status: Progress: Complete Maintenance_and_Update_Frequency: None Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -72.748198 East_Bounding_Coordinate: 71.885316 North_Bounding_Coordinate: 41.291362 South_Bounding_Coordinate: 40.766433 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5ddd7472e4b04a30051ac165 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: Theme_Keyword_Thesaurus: None Theme_Keyword: salt marsh Theme_Keyword: vegetation Theme_Keyword: marsh health Theme_Keyword: estuary Theme_Keyword: Long-Term Ecological Research Theme_Keyword: LTER Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: inlandWaters Theme_Keyword: environment Theme_Keyword: elevation Place: Place_Keyword_Thesaurus: None Place_Keyword: Atlantic Ocean Place_Keyword: United States Place_Keyword: New York Place_Keyword: Suffolk County Place_Keyword: Peconic Bay Place_Keyword: Moriches Bay Place_Keyword: Shinnecock Bay Place_Keyword: Long Island Sound Access_Constraints: None Use_Constraints: The mean elevation 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: Robert Welk Contact_Position: Hydrologic Technician Contact_Address: Address_Type: mailing and physical address Address: 2045 NY 112 City: Coram State_or_Province: NY Postal_Code: 11727 Contact_Voice_Telephone: 631-736-0783 x141 Contact_Electronic_Mail_Address: rwelk@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/5ddd7472e4b04a30051ac165?name=elev_ELI_browse.png&allowOpen=true Browse_Graphic_File_Description: Graphic that shows elevation of conceptual marsh units of the eastern Long Island salt marsh complex. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft 10 Version 6.2 (Build 9200); Esri ArcGIS 10.7.1 (Build 11595) Service Pack N/A (Build N/A) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Marsh units and water and land boundaries inherit their horizontal accuracy from the accuracy of the source data, the eastern Long Island marsh units, and their vertical accuracy from the 2015 U.S. Geological Survey National Elevation Database (USGS NED). Logical_Consistency_Report: Positive elevation indicates above sea level. Marsh units with extremely low elevation (smaller than 0.2 percentile value), extremely high elevation (larger than 99.8 percentile value) or areas less than 900 square meters were flagged. Completeness_Report: The results are specific to the marsh polygons as defined within the boundaries of the eastern Long Island salt marsh complex. 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 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 depends on both the horizontal accuracy of the NWI dataset and the vertical accuracy of the source elevation data, NED. NED vertical elevation accuracy is 0.2 meters. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2015 Title: National Elevation Dataset Geospatial_Data_Presentation_Form: Raster Digital dataset Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://nationalmap.gov/viewer.html Type_of_Source_Media: Digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NED Source_Contribution: Downloaded NED Digital Elevation Model from the National Map. Projection was NAD 1983 UTM Zone 18N with the North American Vertical Datum of 1988 (NAVD 88). Download date was 2019/08/01. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2017 Title: NAIP Digital Ortho Photo Image Geospatial_Data_Presentation_Form: Remote-sensing image Publication_Information: Publication_Place: Salt Lake City, Utah Publisher: USDA-FSA-APFO Aerial Photography Field Office Online_Linkage: https://earthexplorer.usgs.gov Online_Linkage: https://www.sciencebase.gov/catalog/item/51355312e4b0e1603e4fed62 Type_of_Source_Media: Digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NAIP Source_Contribution: Downloaded NAIP 1-meter resolution imagery from the USGS Earth Explorer. Projection was WGS 1984 Web Mercator Auxiliary Sphere. Download date was 2019/08/01. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Fish and Wildlife Service Publication_Date: 2017 Title: National Wetland Inventory New York Wetlands Geospatial_Data_Presentation_Form: Vector Digital dataset (Polygon) Publication_Information: Publication_Place: Madison, WI Publisher: U.S. Fish and Wildlife Service Online_Linkage: https://www.fws.gov/wetlands/data/Data-Download.html Type_of_Source_Media: Digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NWI Source_Contribution: Downloaded wetlands data for the state of New York in Shapefile format from the NWI download page. Projection was NAD 1983 Albers. Download date was 2018/08/01. Source_Information: Source_Citation: Citation_Information: Originator: New England Interstate Water Pollution Control Commission, Prepared by Cameron Engineering and Associates, LLP Publication_Date: 2015 Title: Long Island Tidal Wetlands Trends Analysis Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon) Online_Linkage: http://www.dec.ny.gov/lands/5113.html Type_of_Source_Media: Digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NYSDEC Source_Contribution: Wetland polygon shapefile prepared for Long Island Tidal Wetlands Trends Analysis. Data available by request. Data acquired 2019/05/01. Process_Step: Process_Description: This process step and all subsequent process steps were performed by the same person, Robert Welk, in ArcMap (ver. 10.6.1) using tools from ArcToolbox, unless otherwise stated. For complex operations, names of specific tools used are given in CAPITAL letters (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 (m2) unless otherwise stated. a) Set the data frame coordinate system and projection to NAD 1983 UTM Zone 18N. Prepare elevation dataset to be clipped to the boundaries polygon. MOSAIC TO NEW RASTER(Pixel type=32 bit float; Mosaic operator=Mean; Cellsize=1 m) the entire NED raster to a new raster dataset with 1 m resolution [elev_mosaic.tif]. b) Calculate values for each marsh unit. DISSOLVE(Input features=[CMU_ELI]; Dissolve field=FID_CMU; Statistics field=ATOT_M2 and FLG with Statistics type= First) to dissolve the vegetated and unvegetated classes in each marsh unit. FLG flags anomalous marsh units based on absence of vegetation, elevation and surface area, and is set to (-1) no vegetated area; (-10) marsh unit elevation higher than the 99.8 percentile; (-100) marsh unit elevation less than 0.2 percentile; (-1000) marsh unit surface area less than 900 m2; and (0) no flag. Combination of negative values indicate a combination of flags. For example, -1001 indicates no vegetated area and area less than 900 m2. PROJECT(Input coordinate system=WGS 1984 Web Mercator Auxiliary Sphere; Output coordinate system=NAD 1983 UTM Zone 18N; Geographic transformation=WGS 1984 (ITRF00) to NAD 1983) the feature dataset to obtain dissolved marsh units [mu_diss.shp]. c) Clip the raster with the polygon features by using EXTRACT BY MASK to obtain [elev_idw_mu.tif]. d) ZONAL STATISTICS AS TABLE(Feature Zone Data=[mu_diss.shp]; zone field=FID_CMU; Value Raster=[elev_idw_mu.tif]; Output Table=mu; Statistics type=MEAN) e) ADD JOIN(Layer name=[mu_diss.shp]; Input join field=FID_CMU; Join Table=mu; Output join field=FID_CMU) to marsh units layer based on the "FID_CMU" field f) Export dataset as a shapefile [mu_elev.shp] and keep the 'mu_MEAN" and "mu_ATOT_M2" fields from the join operation. g) Calculate elevation of the vegetated areas only. SELECT BY ATTRIBUTES FROM [CMU_ELI] where "CLASS"= 'vegetated'. Follow steps (c) to (f) using the selected features to export [veg_elev.shp]. h) JOIN FIELD(Input table=[mu_elev.shp]; Input join field=mu_FID_CMU; Join table=[veg_elev.shp]; Output join field=vg_FID_CMU; Join fields=vg_AVEG_M2,vg_ATOT_M2,vg_MEAN). Change the field names to VG_ELEV and MU_ELEV respectively for the fields with the mean elevation for the vegetated area only and mean elevation for the entire marsh unit. Set VG_ELEV to -9999 if there is no vegetated area in the marsh unit. Name AVEG_M2 and ATOT_M2 for vegetated and total area, respectively, and export to a new shapefile. [mu_elev_ELI.shp]. i) Calculate metrics that quantify the distribution of marsh unit elevation values. SKWNSS is the measure of skewness of the elevation distribution in the vegetated part of a marsh unit. Positive skewness values, i.e. right-skewed distributions, indicate clustering of elevation distributions towards lower elevations. Negative numbers indicate a left-skewed distribution and clustering towards higher elevations. LOW3RD is the percent of elevation values that fall within the lowest third of the elevation range within the vegetated part of a marsh unit. SKWNSS and LOW3RD parameters are calculated by applying the formulation of Raposa et al. (2016) to the elevation raster within the vegetated part of each marsh unit. j) SELECT BY ATTRIBUTES FROM [CMU_ELI] where "CLASS"= 'vegetated', and join field "APGN_M2" from CMU_ELI.shp on the feature dataset [mu_elev_ELI.shp]. k) Calculate ratio of hydroflattened area in each marsh unit. Reclassify NED elevation raster with RASTER CALCULATOR (expression: SetNull('elev_mosaic.tif' == -1, 'elev_mosaic.tif') to get [elev_null.tif]. ZONAL STATISTICS AS TABLE (Input table=[mu_elev.shp, Zone field=FID_CMU], Input value raster=elev_null.tif, Statistics type=Mean) to get [hfar_mu]. ADD FIELD to output table 'MU_HFAR' and use FIELD CALCULATOR ((1-MEAN/2)). JOIN FIELD(Input Table=mu_elev.shp, Input Join Field=FID_CMU, Join Table=hfar_mu, Output Join Field=FID_CMU). If 'MU_HFAR' > 0.25, set 'mu_elev' = 0. l) Calculate ratio of hydroflattened area in the vegetated area of each marsh unit. ZONAL STATISTICS AS TABLE (Input table=[veg_elev.shp, Zone field=FID_CMU], Input value raster=elev_null.tif, Statistics type=Mean) to get [hfar_veg]. ADD FIELD to output table 'VG_HFAR' and use FIELD CALCULATOR ((1-MEAN/2)). JOIN FIELD(Input Table=mu_elev.shp, Input Join Field=FID_CMU, Join Table=hfar_veg, Output Join Field=FID_CMU). If 'MG_HFAR' > 0.25, set 'vg_elev' = 0. m) Rearrange field names and change the projection for better performance of web services with online base maps. PROJECT(Input coordinate system=NAD 1983 UTM Zone 18N; Output coordinate system=WGS 1984 Web Mercator Auxiliary Sphere; Geographic transformation=WGS 1984 (ITRF00) to NAD 1983) the feature dataset to obtain the final conceptual marsh units [mu_elev_ELI.shp]. Reference: Raposa, K. B., Wasson, K., Smith, E., Crooks, J. A., Delgado, P., Fernald, S. H., et al. (2016). Assessing tidal marsh resilience to sea-level rise at broad geographic scales with multi-metric indices. Biological Conservation, 204, 263–275. https://doi.org/10.1016/J.BIOCON.2016.10.015 Source_Used_Citation_Abbreviation: elev_mosaic Source_Used_Citation_Abbreviation: CMU_ELI Source_Used_Citation_Abbreviation: NAIP Process_Date: 2019 Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20200806 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: Version 2 updates. Updates were performed in ArcGIS Pro 2.8.8. Duplicate marsh units were manually identified and compared to make sure the most appropriate duplicate marsh unit was deleted. Seventy-six duplicate marsh units were identified (out of 2828) in Mecox Bay, Sagaponack Pond and Georgica Pond and have been removed. After the duplicate marsh units were deleted, the elevation, hydroflattened percentage and elevation flag values were recalculated. Authorship was updated to include Kate Ackerman. Process_Date: 20240116 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Kate Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: US Contact_Voice_Telephone: 508-548-8700 x2331 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: kackerman@usgs.gov 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: 2752 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: Meter Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Attribute values Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: mu_elev_ELI Entity_Type_Definition: Attribute information associated with the mean elevation of the conceptual marsh units of the eastern Long Island salt marsh complex. Entity_Type_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: FID_CMU Attribute_Definition: Unique whole numbers used to identify each conceptual marsh unit. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2 Range_Domain_Maximum: 3455 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: 8.876088 Range_Domain_Maximum: 1278469.79671 Attribute_Units_of_Measure: square meters Attribute: Attribute_Label: AVEG_M2 Attribute_Definition: Surface area of vegetated part of a marsh unit in square meters. Value is set to -9999 if there is no vegetated area in the marsh unit. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 1189344.84656 Attribute_Units_of_Measure: square meters Attribute: Attribute_Label: MU_ELEV Attribute_Definition: Mean elevation of a marsh unit in meters. MU_ELEV is set to -9999 if a no data cell value is provided in the input DEM to indicate the absence of real elevation values. 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: -1.49903 Range_Domain_Maximum: 6.82453 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: VG_ELEV Attribute_Definition: Mean elevation of the vegetated area in a marsh unit in meters. VG_ELEV is set to -9999 if a no data cell value is provided in the input DEM to indicate the absence of real elevation values. 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: -1.38023 Range_Domain_Maximum: 6.819696 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: MU_HFAR Attribute_Definition: Ratio of DEM hydroflattened area in marsh unit. If MU_HFAR > 0.25, MU_ELEV is set to -9999. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 1 Attribute: Attribute_Label: VG_HFAR Attribute_Definition: Ratio of DEM hydroflattened area in marsh unit. If VG_HFAR > 0.25, VG_ELEV is set to -9999. 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 Range_Domain_Maximum: 1 Attribute: Attribute_Label: SKWNSS Attribute_Definition: SKWNSS is the measure of skewness of the elevation distribution in the vegetated part of a marsh unit. Positive skewness values i.e. right-skewed distribution indicate clustering of elevation distribution towards lower elevations. Negative numbers indicate a left-skewed distribution and clustering towards higher elevations. Values of -9999 indicate no vegetated area within 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: -7.49949 Range_Domain_Maximum: 7.65854 Attribute: Attribute_Label: LOW3RD Attribute_Definition: LOW3RD is the percent of elevation values that fall within the lowest third of the elevation range within the vegetated part of a marsh unit. Values of -9999 indicate no vegetated area within 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: 0.0227015 Range_Domain_Maximum: 99.66590118 Attribute: Attribute_Label: FLG Attribute_Definition: Marsh unit flag indicating anomalous marsh units based on elevation, surface area, and absence of vegetation. FLG values indicate: (-1) no vegetated area; (-10) marsh unit elevation higher than the 99.8 percentile; (-100) marsh unit elevation less than 0.2 percentile; (-200) greater than 25% of marsh unit has hydroflattened area (and has -9999 as its elevation value; (-1000) marsh unit surface area less than 900 m2; and (0) no flag. Combination of negative values indicate combination of flags. For example, -1001 indicates no vegetated area and area less than 900 m2. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -11201 Range_Domain_Maximum: 0 Attribute_Units_of_Measure: None Overview_Description: Entity_and_Attribute_Overview: In this dataset, mean elevation for each conceptual salt marsh unit in the eastern Long Island salt marsh complex has 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: mu_elev_ELI.shp (and other files associated with a shapefile), browse graphic, and 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: shapefile Format_Version_Number: ArcGIS Pro 2.8.8 Format_Information_Content: This dataset contains a polygon shapefile and its components and metadata in xml format. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5ddd7472e4b04a30051ac165 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5ddd7472e4b04a30051ac165 Network_Resource_Name: https://doi.org/10.5066/P91H426U 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. The third link is to the main page of the data release. 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/5ddd7472e4b04a30051ac165?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/5ddd7472e4b04a30051ac165?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 dataset. Metadata_Reference_Information: Metadata_Date: 20240312 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Person: Robert J Welk Contact_Position: Hydrologic Technician Contact_Address: Address_Type: mailing address Address: 2045 Route 112 City: Coram State_or_Province: NY Postal_Code: 11727 Country: US Contact_Voice_Telephone: 631-736-0783 x141 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