Metadata: Identification_Information: Citation: Citation_Information: Originator: Zafer Defne Originator: Neil K. Ganju Publication_Date: 2019 Title: Conceptual marsh units for Cape Cod National Seashore salt marsh complex, Massachusetts Edition: 1.0 Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon) Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P955K1Y2 Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Defne, Z., and Ganju, N.K., 2019, Conceptual marsh units for Cape Cod National Seashore salt marsh complex, Massachusetts: U.S. Geological Survey data release, https://doi.org/10.5066/P955K1Y2 Online_Linkage: https://doi.org/10.5066/P955K1Y2 Description: Abstract: The salt marsh complex of Cape Cod National Seashore (CACO), Massachusetts, USA and approximal wetlands were delineated to smaller, conceptual marsh units by geoprocessing of surface elevation data. Flow accumulation based on the relative elevation of each location is used to determine the ridge lines that separate each marsh unit while the surface slope is used to automatically assign each unit a drainage point, where water is expected to drain through. 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. The intent is to provide federal, state, and local managers with tools to estimate their vulnerability and ecosystem service potential. 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. CACO is one of the selected domains to expand this study. Purpose: These polygons were created to be used in evaluating the spatial variation of the response and resiliency of the salt marsh complex based on consistently defined marsh units while facilitating a better understanding of the relative importance of the processes involved. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.240881163 East_Bounding_Coordinate: -69.929876024 North_Bounding_Coordinate: 42.071513705 South_Bounding_Coordinate: 41.603266713 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5c62f0fae4b0fe48cb34c883 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 Place: Place_Keyword_Thesaurus: None Place_Keyword: Atlantic Ocean Place_Keyword: United States Place_Keyword: Massachusetts Place_Keyword: Barnstable County Place_Keyword: Cape Cod National Seashore Place_Keyword: Cape Cod Bay Place_Keyword: Wellfleet Harbor Place_Keyword: Little Pleasant Bay Place_Keyword: Herring Cove Place_Keyword: Outer Cape Access_Constraints: None Use_Constraints: These polygons 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: Zafer Defne Contact_Position: Ocean Scientist 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/5c62f0fae4b0fe48cb34c883?name=CMU_CACOp.png.png Browse_Graphic_File_Description: Graphic that shows conceptual marsh units of CACO salt marsh complex overlaying Esri basemap. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.5.1 (Build 7333) Service Pack N/A (Build N/A) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Marsh units, water and land boundaries inherit their accuracy from the accuracy of the U.S. Fish and Wildlife Service National Wetland Inventory (USFWS NWI) published in 2017. However, the lineage of the source data indicates that the underlying data span over multiple years and the mapped features may have changed since the date of imagery. Accuracy of marsh unit delineation depends on the vertical and horizontal accuracy of the U.S. Geological Survey Coastal National Elevation Database (USGS CoNED) data with processing date of 2018. Vegetated and unvegetated polygons accuracy is based on the 1-meter resolution National Agriculture Imagery Program (NAIP) products with processing dates of 2016. Any vegetated or unvegetated polygons less than 9 square meters were merged to the surrounding majority class. While creating marsh units conterminous polygons smaller than 900 square meters have been merged with the larger polygon of the same type. Logical_Consistency_Report: Topological errors that occurred during geoprocessing were automatically removed by the topological rules used for the analysis. The polygons are checked for correct geometry and do not overlap. Small polygons (less than 9 square meters) were assumed to be marginal and were assigned the classification from the surrounding majority value. A visual comparison between NAIP imagery was performed at randomly selected sites to verify the land and water boundaries. Completeness_Report: The marsh polygons are bound to the boundaries of the CACO areas that include Estuarine intertidal areas of 1) Emergent, 2) Scrub-shrub, 3) Rooted vascular aquatic bed, 4) Organic unconsolidated shore, and 5) channels of open water that are wider than 10 meters. Sliver polygons of open salt water along the marsh edges may also be included in some instances as a result of geoprocessing. A detailed on-the-ground analysis of a single site may result in a different interpretation of the wetland and marsh unit boundaries than established through this analysis. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal accuracy is inherited from CoNED topobathymetric model. Vegetated and unvegetated polygons were based on the 1-meter resolution NAIP imagery. Although the analyses were performed at 1-meter resolution, the horizontal accuracy is superseded by NAIP imagery accuracy, +/-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 NWI dataset and the vertical accuracy of source elevation data, CoNED. CoNED vertical elevation accuracy was 0.2 meters. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Jeffrey Danielson Originator: Dean Tyler Publication_Date: 2018 Title: Topobathymetric Model for the New England Region States of New York, Connecticut, Rhode Island, and Massachusetts, 1887 to 2016 Geospatial_Data_Presentation_Form: Raster Digital Data Set Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://earthexplorer.usgs.gov Online_Linkage: https://nationalmap.gov/viewer.html Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2018 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: CoNED Source_Contribution: Downloaded CoNED topobathymetric data from USGS Earth Explorer. Projection was NAD 1983 UTM Zone 19N with the North American Vertical Datum of 1988 (NAVD 88). Download date was 2018/05/25. 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: online 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 2018/07/17. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Fish and Wildlife Service Publication_Date: 2017 Title: National Wetland Inventory Massachusetts Wetlands Geospatial_Data_Presentation_Form: Vector Digital Data Set (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: online 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 Massachusetts in Shapefile format from the NWI download page. Projection was NAD 1983 Albers. Download date was 2018/07/16. Process_Step: Process_Description: This process step and all subsequent process steps were performed by the same person, Zafer Defne, in ArcMap (ver. 10.5.1) 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. Set the data frame coordinate system and projection to NAD 1983 UTM Zone 19N. 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) all of the CoNED raster to a new raster dataset with 1 m resolution [elev_mosaic.tif]. Source_Used_Citation_Abbreviation: CoNED Process_Date: 2018 Source_Produced_Citation_Abbreviation: elev_mosaic Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Zafer Defne Contact_Position: Ocean Scientist 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: Prepare mask polygon to define analysis boundaries. In order to account for the possible influence of the surrounding terrain on the analysis, first a mask area larger than the salt marsh extent is created [UVVR_mask]. At the end of the analysis the results are clipped to the boundaries of the salt marsh area [MU_mask]. Both UVVR_mask and MU_mask are edited to decide which interior polygons are removed. a) EXPORT features from NWI dataset after SELECT("ATTRIBUTE" LIKE 'E2%EM%' OR "ATTRIBUTE" LIKE 'E2AB3%' OR "ATTRIBUTE" LIKE 'E2EM%' OR "ATTRIBUTE" LIKE 'E2SS%' OR "ATTRIBUTE" LIKE 'E2US4%') to select from estuarine intertidal areas of 1) Emergent, 2) Scrub-shrub, 3) Rooted vascular aquatic bed, 4) Organic unconsolidated shore classes [NWI_exclusive_select.shp]. b) BUFFER(Input features=[NWI_exclusive_select.shp]; Linear unit=5 meters; Dissolve type=All) to obtain the mask polygon [buff5m.shp] and ELIMINATE POLYGON PART(Condition=Percentage; Percentage=99; Eliminate contained part only) to obtain [UVVR_mask01.shp]. Apply buffer with -5 meters to obtain [MU_mask01.shp]. c) EXPORT features from NWI dataset after SELECT("ATTRIBUTE" NOT LIKE 'E%' OR "ATTRIBUTE" LIKE '%FO')to obtain features that are not estuarine or are forested estuarine. MULTIPART TO SINGLEPART to separate individual polygons [NWI_inclusive_single.shp]. d)To exclude the voids in the NWI map during the analysis these interior polygons need to be removed from the mask. Create a rectangular polygon that covers the domain [extent.shp]. ERASE [NWI_excusive_select.shp] from [extent.shp] and MULTIPART TO SINGLEPART to get [NWI_voids_single.shp]. e) SELECT BY LOCATION from [NWI_inclusive_single.shp] that are completely within the [MU_mask01.shp], and SELECT BY LOCATION from [NWI_voids_single.shp] that are completely within the [MU_mask01.shp]. If any of additional polygons need to be removed from the mask include them in a new feature layer [erase_mask_manual.shp]. Merge all three feature sets to get polygons to be excluded [erase_inside.shp] from the final masks. f) ERASE [erase_inside.shp] from [MU_mask01.shp] and [UVVR_mask01.shp] to obtain [MU_mask.shp] and [UVVR_mask.shp], respectively. Source_Used_Citation_Abbreviation: NWI Process_Date: 2018 Source_Produced_Citation_Abbreviation: UVVR_mask Process_Step: Process_Description: Define preliminary boundaries for marsh units by basin analysis: a) EXTRACT BY MASK from mosaicked elevation dataset using [UVVR_mask.shp] polygon. b) FILL(no Z limit) sinks in extracted elevation raster. c) Calculate FLOW DIRECTION(do not force edge cells flow outward) raster. d) Calculate BASIN based on flow direction raster [basin_buff5m.tif]. e) Apply MAJORITY FILTER(Number of neighbors=8) to clean the raster and convert RASTER TO POLYGON. CLIP the polygon with 1-meter buffered marsh units mask [MU_mask_buff1m.shp]. This additional buffer is necessary to prevent any polygon smoothing algorithm from changing the exterior boundaries and will be removed by clipping to the [MU_mask.shp] later. MULTIPART TO SINGLEPART and ADD GEOMETRY ATTRIBUTES(Geometry properties=Area_geodesic; Area unit=Square_meters) to get [basin_single.shp] Source_Used_Citation_Abbreviation: elev_mosaic Source_Used_Citation_Abbreviation: UVVR_mask Process_Date: 2018 Source_Produced_Citation_Abbreviation: basin_single Process_Step: Process_Description: This step merges the "orphan marsh units", units that are less than 5000 m2 in area to the nearest to "parent marsh units", units that are larger than 5000 m2 to obtain the preliminary marsh units. A Python script that iteratively calls a list of ArcMap tools to aggregate orphan units on parent units is used: a) Create orphan marsh units features by exporting marsh units with an area less than 5000 m2 [lt5000.shp]. b) Create parent marsh units features by exporting marsh units with an area greater than or equal to 5000 m2 [ge5000.shp]. c) Run Python script (hydUnitloop.py). At each iteration step the script uses NEAR tool to find orphan marsh units within 1 m of a parent marsh unit and merges them to the parent using UNION and DISSOLVE tools. The orphan units merged with a parent unit are removed from the orphan units data set. Script will iterate until there is no change in the number of parent or orphan marsh units. d) The remaining orphan marsh units are those that are more than 1 m away from any parent. DISSOLVE them to create larger orphan units by grouping the orphans attached together into larger units. e) MULTIPART TO SINGLEPART to have single part polygons with unique identifiers. f) UNION(with gaps) single part features with parent units to obtain preliminary marsh units [pMUopt1.shp]. g) SMOOTH POLYGON(Smoothing algorithm=PAEK; Smoothing tolerance=15 meters) to get the smoothed marsh units polygon [pMUopt1_smooth.shp]. h) CLIP the extra buffer around the smoothed marsh units using the marsh units mask, [MU_mask.shp]. If this results in any additional marsh units with an area less than 5000 m2, dissolve into the nearest parent units repeating the same steps above to obtain [pMUopt1_clip_final.shp] i) Compute the final marsh units by removing any artefacts from [pMuOpt1_clip_final.shp] using ELIMINATE and REPAIR GEOMETRY tools. ELIMINATE(Expression="Area_geo" less than 900; Eliminating by border) polygon slivers smaller than 900 m2 by merging them to the main polygon. MULTIPART TO SINGLEPART to get conceptual marsh units [CMU.shp]. This only applies to polygons that are bordering other polygons. Polygons that are not bordering other polygons are not affected as those are more likely to be real features as opposed to geoprocessing artefacts. j) DISSOLVE the conceptual marsh units to get the final outlines for the marsh complex [CMU_mask_final.shp]. Source_Used_Citation_Abbreviation: basin_single Process_Date: 2018 Source_Produced_Citation_Abbreviation: CMU Process_Step: Process_Description: Determine the vegetated and unvegetated areas by image processing. a) EXTRACT BY MASK from elevation raster [elev_mosaic.tif] using [UVVR_mask.shp] polygon. Rescale the elevation raster values to the same range with 8-bit NAIP imagery (0 to 255) using min-max scaling. Perform ISO CLUSTER UNSUPERVISED CLASSIFICATION with 4-bands (Near Infrared, Blue, Green, Red from the NAIP imagery and the rescaled elevation raster with 32 classes a minimum class size of 5000 cells. RECLASSIFY the classified raster by visually comparing the NAIP imagery to obtain the unvegetated-vegetated raster [UVVc.tif]. b) Dissolve unvegetated regions smaller than a threshold value to the surrounding vegetated regions and vice versa to clean the UVV raster. For this purpose use the REGION(Number of neighbors=4; Zone grouping method=Within; Add Link field to output) to get the [UVV_region.tif], and TEST("Count" less than 9) to set a threshold value of 9 raster cells [UVV_test.tif]. Use RASTER CALCULATOR to toggle the value of the Link field in the region raster, where the test raster indicates regions with areas smaller than the threshold. c) RASTER TO POLYGON(Simplify polygons=False) and CLIP with the final marsh complex outline [CMU_mask_final.shp] to obtain [UVVc_filt_clip.shp]. d) REPAIR GEOMETRY and DISSOLVE(Create multipart features=False) to get filtered, clipped and dissolved unvegetated-vegetated polygons [UVVc_filt_clip_diss.shp]. e) INTERSECT the final conceptual marsh units [CMU.shp] with unvegetated-vegetated polygons [UVVc_filt_clip.shp], REPAIR GEOMETRY, and calculate the area of unvegetated and vegetated polygons in each marsh unit. To do this ADD GEOMETRY ATTRIBUTES(Geometry properties=Area_geodesic; Area unit=Square_meters) to get [UVV_poly.shp], and DISSOLVE(Input features=UVV_poly.shp; Dissolve fields=FID_CMU, gridcode; Statistics field=gridcode.MEAN, Area_geo.SUM) and REPAIR GEOMETRY to get [UVV_poly_diss.shp]. Edit the fields to have "TYP", "APGN_M2", and "ATOT_M2" fields for type of polygon indicating vegetated or unvegetated, surface area of the polygon, and total surface area of the marsh unit, respectively. f) Add field "UVVR" and calculate unvegetated to vegetated ratio based on "TYP", "APGN_M2" and "ATOT_M2" fields. If the vegetated area is zero for a marsh unit set the value of UVVR to -1. g) Calculate the mean elevation for each marsh unit with ZONAL STATISTICS AS TABLE(Raster layer=[elev_mosaic.tif]; Zone features=[CMU.shp], Zone field=FID_CMU; Statistics type=Mean; Ignore Nodata=True) and JOIN with [CMU.shp] to get [mu_elev.shp]. Source_Used_Citation_Abbreviation: elev_mosaic Source_Used_Citation_Abbreviation: NAIP Process_Date: 2018 Source_Produced_Citation_Abbreviation: mu_elev Source_Produced_Citation_Abbreviation: UVV_poly_diss Process_Step: Process_Description: Finalize the conceptual marsh units. a) Add field "COLORID" to cycle through integers from 0 to 9 to be used for coloring the marsh units. This field is used for display purposes only to distinguish between each marsh unit. b) Add field "FLG" to flag anomalous marsh units based on absence of vegetation, elevation and surface area. Set FLG 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 combination of flags. For example, -1001 indicates no vegetated area and area less than 900 m2. c) 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 19N; 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 [CMU_CACOp.shp]. Source_Used_Citation_Abbreviation: CMU Source_Used_Citation_Abbreviation: mu_elev Source_Used_Citation_Abbreviation: UVV_poly_diss Process_Date: 2018 Source_Produced_Citation_Abbreviation: CMU_CACOp Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20200804 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 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: 1027 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: CMU_CACOp Entity_Type_Definition: Attribute information associated with the conceptual marsh units of CACO 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: 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: Sequential whole numbers that represents the identification number for each conceptual marsh units. These numbers are duplicated when a marsh unit has both vegetated and unvegetated sub-polygons. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 522 Attribute_Units_of_Measure: none Attribute: Attribute_Label: COLORID Attribute_Definition: Recycling sequential whole numbers (0-9) that are used for display purposes when plotting conceptual marsh units. These numbers are duplicated when a marsh unit has both vegetated and unvegetated sub-polygons. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 9 Attribute_Units_of_Measure: none Attribute: Attribute_Label: APGN_M2 Attribute_Definition: Surface area of the selected polygon type (vegetated or unvegetated). Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.174545 Range_Domain_Maximum: 429886.815359 Attribute_Units_of_Measure: square meters Attribute: Attribute_Label: ATOT_M2 Attribute_Definition: Total surface area of the marsh unit. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 134.350305 Range_Domain_Maximum: 444753.212137 Attribute_Units_of_Measure: square meters Attribute: Attribute_Label: TYP Attribute_Definition: Classification of the polygon features in a marsh unit as vegetated or unvegetated. Attribute_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: unvegetated Enumerated_Domain_Value_Definition: Unvegetated part of the marsh unit. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: vegetated Enumerated_Domain_Value_Definition: Vegetated part of the marsh unit. Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: FLG Attribute_Definition: Marsh unit flag indicating anomalous marsh units based on absence of vegetation, elevation and surface area. 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; (-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: -1001 Range_Domain_Maximum: 0 Attribute_Units_of_Measure: None Overview_Description: Entity_and_Attribute_Overview: In this dataset, the salt marsh complex CACO has been delineated to conceptual salt marsh units to facilitate unit by unit evaluation of response and resiliency of marsh system to physical and biogeochemical drivers. Each unit is also analyzed based on the vegetated and unvegetated surface area coverage, the ratio of which can be an independent measure of marsh health for microtidal marshes on the Atlantic and Pacific coasts of the United States. UVVR is calculated as the ratio of unvegetated area to vegetated area in a marsh unit. 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 is assumed to be 1 meter. COLORID is defined to limit the legend entries to 10 instead of the total number of entities for practical reasons. It is used for display purposes only. 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: CMU_CACOp 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 10.5.1 Format_Information_Content: This zipped file contains a polygon shapefile and its components, a style layer descriptor file, metadata in xml, txt and html formats and a browse image. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5c62f0fae4b0fe48cb34c883 Network_Resource_Name: https://doi.org/10.5066/P955K1Y2 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/5c62f0fae4b0fe48cb34c883?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/5c62f0fae4b0fe48cb34c883?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: 20200804 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Zafer Defne Contact_Position: Ocean Scientist 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 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998