Metadata: Identification_Information: Citation: Citation_Information: Originator: Robert Welk Originator: Zafer Defne Originator: Neil K. Ganju Publication_Date: 20200721 Title: Rate of shoreline change of marsh units in Hudson Valley and New York City salt marsh complex, New York Edition: 1.0 Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon) Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9XV0JMJ 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 Online_Linkage: https://doi.org/10.5066/P9XV0JMJ Online_Linkage: https://www.sciencebase.gov/catalog/item/5ede609882ce7e579c6e56bf Larger_Work_Citation: Citation_Information: Originator: Robert Welk Originator: Zafer Defne Originator: Neil Ganju Publication_Date: 2020 Title: Coastal wetlands of Hudson Valley and New York City, New York Edition: 1.0 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9XV0JMJ Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Welk, R.J., Defne, Z., and Ganju, N.K., 2020, Coastal wetlands of Hudson Valley and New York City, New York: U.S. Geological Survey data release, https://doi.org/10.5066/P9XV0JMJ Online_Linkage: https://doi.org/10.5066/P9XV0JMJ Online_Linkage: https://www.sciencebase.gov/catalog/item/5eda9f5282ce7e579c69c834 Description: Abstract: This data release contains coastal wetland synthesis products for the geographic region of Hudson Valley and New York City, New York. Metrics for resiliency, including unvegetated to vegetated ratio (UVVR), marsh elevation, mean tidal range, and shoreline change rate 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. This dataset displays shoreline change rates for Hudson Valley and New York City. Shoreline change rates are based on analysis of digital vector shorelines acquired from historical topographic sheets provided by National Oceanic and Atmospheric Administration (NOAA). Analysis was performed using the Digital Shoreline Analysis System (DSAS), an extension for ArcMap, created by the U.S. Geological Survey. Linear Regression Rates (LRR) and End Point Rates (EPR) of shoreline change were averaged along the shoreline of each salt marsh unit to generate this dataset. LRR rates were used in areas where three or more historical shorelines were available while EPR was used in areas where two were available. Positive and negative values indicate accretion and erosion respectively. Purpose: Analysis of shoreline change rates is part of a comprehensive assessment to identify the factors and their weights in determining the vulnerability and resiliency of salt marshes. This polygon dataset facilitates quantifying these rate changes in the Hudson Valley and New York City salt marsh complex by summarizing the rate change results over the previously determined conceptual salt marsh unit polygons. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -74.2459935 East_Bounding_Coordinate: -73.6566221 North_Bounding_Coordinate: 41.6797007 South_Bounding_Coordinate: 40.5021037 Keywords: 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: tides (oceanic) Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: shoreline Theme_Keyword: coastline Theme_Keyword: accretion Theme_Keyword: sediment Theme_Keyword: salt marsh Theme_Keyword: vegetation Theme_Keyword: marsh health Theme_Keyword: estuary Theme_Keyword: resilience Theme_Keyword: vulnerability Theme_Keyword: polygon shapefile Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: inlandWaters Theme_Keyword: environment Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5ede609882ce7e579c6e56bf Place: Place_Keyword_Thesaurus: None Place_Keyword: Hudson River Place_Keyword: United States Place_Keyword: New York Place_Keyword: Staten Island Place_Keyword: Queens County Place_Keyword: Westchester County Place_Keyword: Dutchess County Place_Keyword: Putnam County Place_Keyword: Lower Bay Place_Keyword: Upper Bay Access_Constraints: None Use_Constraints: The shoreline change rates in this dataset are 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 Route 112 City: Coram State_or_Province: NY Postal_Code: 11743 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/5ede609882ce7e579c6e56bf?name=shoreline_HvNYC_browse.png Browse_Graphic_File_Description: Graphic that shows the shoreline change rate overlaying Esri Map. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft [Unknown] 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: Water-land boundaries and marsh unit boundaries inherit their accuracy from the source data, the conceptual salt marsh units. Shoreline change rate is calculated by averaging the values from the source layer (shoreline change transects are drawn every ~50 meters along a baseline) for each marsh unit. Shoreline change rates in the source data are influenced by the availability and accuracy of historical shoreline data. Logical_Consistency_Report: Mean Linear Regression Rate (MEAN_LRR) is calculated by averaging the LRR transects that cross the shoreline of a marsh unit. Likewise, Mean End-point Rate (MEAN_EPR) is calculated by averaging the EPR transects that cross the shoreline of a marsh unit. If a marsh unit has a shoreline, but no transect is available to assign a shoreline change rate, the mean LRR and/or mean EPR is set to -9999. Completeness_Report: The results are specific to the conceptual marsh unit polygons as defined within the boundaries of the Hudson Valley and New York City 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. All of the marsh units are assigned a value. Some marsh units may have a MEAN_LRR or MEAN_EPR rate, but no SHORE_LEN value available while others have a calculated SHORE_LEN but no available MEAN_LRR or MEAN_EPR. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal accuracy for the polygon boundaries is inherited from the source layer, the conceptual marsh units and considered to be +/- 6 meters. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Robert Welk Publication_Date: 2019 Title: Rate of shoreline change statistics for New York State coastal wetlands Edition: 1.0 Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polyline) Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9JVMLFT Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9JVMLFT Type_of_Source_Media: Online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: LRR_transects Source_Contribution: Used the LRR and EPR transects to calculate the shoreline change rates at each marsh unit. Download date was 2020/03/01. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2020 Title: Coastal wetlands of Hudson Valley and New York City, New York Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon) Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://www.sciencebase.gov/catalog/item/5eda9f5282ce7e579c69c834 Type_of_Source_Media: Digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: CMU_HvNYC Source_Contribution: Rate of change transects were projected onto conceptual marsh units. 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 2019/08/01. Process_Step: Process_Description: This process step and all subsequent process steps were performed by the same person, Robert Welk, in ArcMap (ver. 10.7.1) 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 (m^2) unless otherwise stated. Shoreline change rates for the Hudson Valley and New York City salt marsh complex are based on "Rate of shoreline change statistics for New York State coastal wetlands" by Welk (2019). Process_Date: 2020 Process_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: 11735 Contact_Voice_Telephone: 631-736-0783 x141 Contact_Electronic_Mail_Address: rwelk@usgs.gov Process_Step: Process_Description: Calculate shoreline length for each marsh unit. a) From NWI, SELECT BY ATTRIBUTES(WETLAND_TY = 'Estuarine and Marine Deepwater') to obtain coastal water polygon features. EXPORT to obtain [NWI_deepwater.shp]. b) DISSOLVE (Input Features = [NWI_deepwater.shp]) to obtain Output Feature Class = [NWI_deepwater_dissolve.shp]. c) BUFFER (Input features=[NWI_deepwater_dissolve.shp]; Linear unit= -5 meters; Dissolve type=All) to obtain [NWI_deepwater_buffern5m.shp]. d) Create a bounding box polygon [bounding_box.shp]. e) ERASE(Input Features=[bounding_box.shp]; Erase Features=[NWI_deepwater_buffern5m.shp]; Output Feature Class=[land_polygon.shp]). f) ELIMINATE POLYGON PART(Input Features=[land_polygon.shp]; Output Feature Class=[land_polygon_elim.shp]; Condition='Percent'; Percentage=99; Eliminate contained parts only). g) Revert back to open water polygon by ERASE(Input Features=[bounding_box.shp]; Erase Features=[land_polygon_elim.shp]; Output Feature Class=[open_water_polygon.shp]) and BUFFER(Linear unit= 5 meters) to obtain [open_water_buff5m.shp]. h) DISSOLVE(Input Features = [CMU_HvNYC.shp]; Dissolve Field=FID_CMU) to obtain [CMU_dissolve.shp] and convert to line feature by POLYGON TO LINE to get [CMU_line.shp] i) Obtain marsh unit shorelines by INTERSECT(Input Features = [CMU_line.shp] and [open_water_buff5m.shp]; XY Tolerance=1.0 meters; Output Type=LINE) to obtain [mu_shorelines.shp] Source_Used_Citation_Abbreviation: CMU_HvNYC.shp Source_Used_Citation_Abbreviation: NWI Process_Date: 2020 Source_Produced_Citation_Abbreviation: mu_shorelines.shp Process_Step: Process_Description: Calculate the transect coverage and mean LRR and EPR shoreline change in each marsh unit. Transect coverage is the average shoreline length represented by the transects in a marsh unit. a) EXPORT dissolved marsh unit layer [CMU_dissolve.shp] to obtain [mu_ShRC.shp] b) SPATIAL JOIN(Target features=[mu_ShRC.shp]; Join features=[LRR_transects.shp]; Output features=[mu_LRR_trans_join.shp];Join_one_to_many; Match option=INTERSECT) to assign LRR values to the intersecting marsh units. Repeat step for EPR transects to obtain [mu_EPR_trans_join.shp]. c) Calculate the mean LRR for each marsh unit with SUMMARY STATISTICS(Input table=[mu_LRR_trans_Join.shp]; Output_table=[s_LRR]; Statistics Fields=LRR; Statistics type=MEAN; Case field='TARGET_FID'). Repeat step for EPR transects to obtain [s_EPR]. d) Join statistics fields to the marsh unit layer using JOIN FIELD(Input Table=mu_ShRC.shp; Input Join Field=FID_CMU; Join Table=s_LRR; Output Join Field=FID_CMU; Join Fields=MEAN_LRR, FREQUENCY). Repeat step for EPR. e) ADD the TRANS_PER_L field and calculate it as the total shoreline length divided by FREQUENCY. Assign a value of -9999 if the number of transects is equal to zero. Repeat step for EPR transects by adding the TRANS_PER_E field and making the same calculation. f) Edit the attribute table to choose fields to keep and to format the field names. Export the dataset as final output [mu_LRR_HvNYC.shp] Source_Used_Citation_Abbreviation: CMU_dissolve.shp Source_Used_Citation_Abbreviation: LRR_transects.shp Source_Used_Citation_Abbreviation: EPR_transects.shp Process_Date: 2020 Source_Produced_Citation_Abbreviation: mu_shoreline_HvNYC.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: 971 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 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: mu_shoreline_HvNYC Entity_Type_Definition: Table containing attribute information associated with the dataset. 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: Coordinates defining the features. Attribute: Attribute_Label: FID_CMU Attribute_Definition: 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: 2622 Attribute: Attribute_Label: MEAN_LRR Attribute_Definition: Mean shoreline change rate based on a linear regression method. A -9999 value indicates that the marsh unit does not have a shoreline (SHORE_LEN=-9999), or no transect is available for calculation (TRANS_PER_L=-9999). Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -2.15 Range_Domain_Maximum: 2.45 Attribute_Units_of_Measure: meters/year Attribute: Attribute_Label: MEAN_EPR Attribute_Definition: Mean shoreline change rate based on an end-point method. A -9999 value indicates that the marsh unit does not have a shoreline (SHORE_LEN=-9999), or no transect is available for calculation (TRANS_PER_E=-9999). Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.41 Range_Domain_Maximum: 1.71 Attribute_Units_of_Measure: meters/year Attribute: Attribute_Label: SHORE_LEN Attribute_Definition: Shoreline length of marsh unit in meters. A value of -9999 indicates that the marsh unit does not have a shoreline or that the value is not available. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.21035 Range_Domain_Maximum: 2546.542294 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: TRANS_PER_L Attribute_Definition: Average shoreline length,in meters per LRR transect. Calculated by dividing SHORE_LEN by number of LRR transects. A value of -9999 indicates no LRR transect is available or the marsh unit has SHORE_LEN=-9999. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.078537 Range_Domain_Maximum: 1427.133178 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: TRANS_PER_E Attribute_Definition: Average shoreline length, meters represented per EPR transect. Calculated by dividing SHORE_LEN by number of EPR transects. A value of -9999 indicates no EPR transect is available or the marsh unit has SHORE_LEN=-9999. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4.391069 Range_Domain_Maximum: 815.672657 Attribute_Units_of_Measure: meters 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 in the marsh unit; (-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 m^2; (-10000) mean tidal range of marsh unit is extrapolated; and (0) no flag. Combination of negative values indicate 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: -11010 Range_Domain_Maximum: 0 Attribute_Units_of_Measure: None Overview_Description: Entity_and_Attribute_Overview: In this dataset, shoreline change rates are averaged over each conceptual marsh unit in Hudson Valley and New York City. Negative and positive values indicate erosion and accretion, respectively. 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 shoreline change rate values can be assumed to be a practical value such as 0.01 meters/year. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey 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_shoreline_HvNYC.shp (and files associated with a shapefile), browse graphic (shoreline_HvNYC_browse.png), and CSDGM metadata in XML format. Distribution_Liability: Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. 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 10.7.1 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/5ede609882ce7e579c6e56bf Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5ede609882ce7e579c6e56bf Network_Resource_Name: https://doi.org/10.5066/P9XV0JMJ 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/5ede609882ce7e579c6e56bf?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/5ede609882ce7e579c6e56bf?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: 20200721 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: rwelk@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998