Metadata: Identification_Information: Citation: Citation_Information: Originator: Julie C. Bernier Originator: Breanna N. Williams Publication_Date: 20251219 Title: Coastal Features Extracted from Landsat Collection 2 Data, Northern Chandeleur Islands, Louisiana Edition: 1.0 Geospatial_Data_Presentation_Form: raster and tabular digital data Larger_Work_Citation: Citation_Information: Originator: Julie C. Bernier Originator: Breanna N. Williams Originator: Jennifer L. Miselis Publication_Date: 20210921 Title: Coastal Land-Cover and Feature Datasets Derived from Landsat Satellite Imagery, Northern Chandeleur Islands, Louisiana Edition: 2.0 Series_Information: Series_Name: U.S. Geological Survey data release Issue_Identification: doi:10.5066/P9HY3HOR Publication_Information: Publication_Place: St. Petersburg, Florida Publisher: U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center Online_Linkage: https://doi.org/10.5066/P9HY3HOR Description: Abstract: This data release serves as an archive of coastal land-cover and feature datasets derived from Landsat satellite imagery at the northern Chandeleur Islands, Louisiana. To minimize effects of tidal water-level variations, only images that were collected within 2 hours of predicted low tide or that were collected on a rising tide with predicted water levels less than mean sea level at time of image acquisition were analyzed. Water, bare earth (sand), vegetated, and intertidal land-cover classes were mapped from Hewes Point to Palos Island using successive thresholding and masking of the modified normalized difference water index (mNDWI), the normalized difference bare land index (NBLI), and the normalized difference vegetation index (NDVI). Vector shoreline, sand, and vegetated feature extents were extracted for each image by contouring the spectral indices using the calculated threshold values. Barrier platform, beach, and vegetated widths were calculated from the intersection of the shoreline, sand, and vegetated vectors with transects spaced 300 meters (m) (10 pixels) apart alongshore. These data can be used to evaluate decadal-scale barrier landscape changes (Bernier and others, 2021). Purpose: Dissemination of thematic raster data representing land-cover classes derived from 13 Landsat 6 and Landsat 9 Operational Land Imager (OLI) image datasets from the northern Chandeleur Islands, Louisiana. Supplemental_Information: Information about the Landsat missions, sensor and band specifications, data products (including Collection 1 versus Collection 2 processing), and data access can be found at https://www.usgs.gov/landsat-missions. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 20171222 Single_Date/Time: Calendar_Date: 20190110 Single_Date/Time: Calendar_Date: 20190416 Single_Date/Time: Calendar_Date: 20200402 Single_Date/Time: Calendar_Date: 20210115 Single_Date/Time: Calendar_Date: 20210405 Single_Date/Time: Calendar_Date: 20211201 Single_Date/Time: Calendar_Date: 20220331 Single_Date/Time: Calendar_Date: 20230105 Single_Date/Time: Calendar_Date: 20230206 Single_Date/Time: Calendar_Date: 20230214 Single_Date/Time: Calendar_Date: 20230222 Single_Date/Time: Calendar_Date: 20230403 Single_Date/Time: Calendar_Date: 20230918 Single_Date/Time: Calendar_Date: 20231028 Single_Date/Time: Calendar_Date: 20231231 Single_Date/Time: Calendar_Date: 20240225 Single_Date/Time: Calendar_Date: 20240405 Single_Date/Time: Calendar_Date: 20241115 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -88.932712 East_Bounding_Coordinate: -88.742256 North_Bounding_Coordinate: 30.097824 South_Bounding_Coordinate: 29.720211 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:7fdccb63-4e71-43e4-8f21-3f5d72b2e20a Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: imageryBaseMapsEarthCover Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: geomorphology Theme_Keyword: geospatial datasets Theme_Keyword: image collections Theme_Keyword: multispectral imaging Theme_Keyword: coastal ecosystems Theme_Keyword: land use and land cover Theme_Keyword: contouring Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Landsat Theme_Keyword: barrier island Theme_Keyword: spectral indices Theme_Keyword: Otsu thresholding Theme_Keyword: shoreline Theme_Keyword: sand Theme_Keyword: vegetated Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: State of Louisiana Place_Keyword: Chandeleur Islands Place_Keyword: Gulf of America Place: Place_Keyword_Thesaurus: None Place_Keyword: Gulf of Mexico Access_Constraints: No access constraints. Please see 'Distribution Information' for details. Use_Constraints: These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Data_Set_Credit: U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, St. Petersburg Coastal and Marine Science Center (SPCMSC). Funding and (or) support for this analysis were provided as part of the Extending Government Funding and Delivering Emergency Assistance Act (Public Law 117-43), enacted on September 30, 2021. This document was improved by scientific and metadata reviews by Sydney Nick and Tess Rivenbark-Terrano (USGS SPCMSC). Native_Data_Set_Environment: Microsoft Windows 11 Enterprise Version 23H2 (Build 2263.6199); Esri ArcGIS Pro 3.3.2; Python 3 Jupyter Notebooks; ERDAS IMAGINE 2023 Version 16.8.0 Build 2100; MATLAB R2025a Update 1 (25.1.0.2973910); RStudio Version 2025.09.2 Build 418. Cross_Reference: Citation_Information: Originator: Julie C. Bernier Originator: Jennifer L. Miselis Originator: Nathaniel G. Plant Publication_Date: 20210921 Title: Satellite-Derived Barrier Response and Recovery Following Natural and Anthropogenic Perturbations, Northern Chandeleur Islands, Louisiana Series_Information: Series_Name: Remote Sensing Issue_Identification: 13(18), 3778; Special Issue "New Insights into Ecosystem Monitoring Using Geospatial Techniques" Online_Linkage: https://doi.org/10.3390/rs13183779 Cross_Reference: Citation_Information: Originator: Hanqiu Xu Publication_Date: 2006 Title: Modification of Normalised Difference Water Index (NDWI) to Enhance Open Water Features in Remotely Sensed Imagery Series_Information: Series_Name: International Journal of Remote Sensing Issue_Identification: Volume 27, Issue 14 Other_Citation_Details: Pages 3025-3033 Online_Linkage: https://doi.org/10.1080/01431160600589179 Cross_Reference: Citation_Information: Originator: Hui Li Originator: Cuizhen Wang Originator: Cheng Zhong Originator: Aijun Su Originator: Chengren Xiong Originator: Jinge Wang Originator: Junqi Liu Publication_Date: 20170307 Title: Mapping Urban Bare Land Automatically from Landsat Imagery with a Simple Index Series_Information: Series_Name: Remote Sensing Issue_Identification: 9(3), 249 Online_Linkage: https://doi.org/10.3390/rs9030249 Cross_Reference: Citation_Information: Originator: Nobuyuki Otsu Publication_Date: 197901 Title: A Threshold Selection Method from Gray-Level Histograms Series_Information: Series_Name: IEEE Transactions on Systems, Man and Cybernetics Issue_Identification: Volume 9, Issue 1 Other_Citation_Details: Pages 62-66 Online_Linkage: https://doi.org/10.1109/TSMC.1979.4310076 Data_Quality_Information: Logical_Consistency_Report: For each image-acquisition date, Landsat Collection 2 Analysis Ready Data (ARD) and Level-2 science products were downloaded from the USGS EarthExplorer (https://earthexplorer.usgs.gov/) and USGS Earth Resources Observation and Science (EROS) Center Science Processing Architecture (ESPA) On Demand Interface (https://espa.cr.usgs.gov/), respectively. Completeness_Report: 63 Landsat OLI images (Worldwide Reference System 2 [WRS-2] path 21 row 39) acquired between December 2022 and November 2024 were identified that were cloud free in the study area. To minimize the effects of water-level variations on land-cover classification, only images that were collected within 2 hours of predicted low tide or were collected on a rising tide with predicted water levels at time of acquisition less than mean sea level (National Ocean Service [NOS] Center for Operational Oceanographic Products and Services [CO-OPS] station 8760172, Chandeleur Light, LA) were analyzed. The resulting dataset consisted of 13 Landsat 8 and 6 Landsat 9 OLI images. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Geodetic accuracy of Landsat data products depend on the accuracy, number, and distribution of the ground control points and the resolution of the digital elevation model (DEM) used. All ARD and Level-2 science products are derived from Landsat Level-1 Precision and Terrain (L1TP) corrected data and meet pre-defined image-to-image georegistration tolerances of <= 12-meter radial root mean square error (RMSE). The positional accuracy of the satellite-derived features was not systematically evaluated in this study; however, recent analyses of satellite-derived shoreline (SDS) positions extracted using similar methods to those presented here report offsets of 1/3 to 1/2 pixel (10 to 15 m) seaward of measured in-situ shoreline positions. Compared with methods that extract shoreline position from precise elevation measurements (for example, lidar or GPS surveys), SDS positions are not based on a vertical datum (for example, mean sea level or mean high water); instead, SDS positions may include intertidal areas. Lineage: Process_Step: Process_Description: For each image acquisition date, Landsat Collection 2 ARD top-of-atmosphere (TOA) reflectance (reflective bands) and TOA brightness temperature (BT; thermal infrared [TIR] bands) were downloaded from EarthExplorer (https://earthexplorer.usgs.gov/) and Level 2 surface reflectance-derived NDVI images were downloaded from the EROS ESPA On Demand Interface (https://espa.cr.usgs.gov/). Process_Date: 2025 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Process_Step: Process_Description: All images were batch-processed using Spatial Model Editor in ERDAS IMAGINE. The TOA and BT bands were stacked to create 9-band multispectral images and clipped to the study-area extent. From these composite images, two additional spectral indices, mNDWI (Xu, 2006) and NBLI (Li and others, 2017), were calculated. Process_Date: 2025 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Process_Step: Process_Description: Land-cover classification was performed using progressive, automatic thresholding of spectral indices. First, Otsu's method (Otsu, 1979) for automatic histogram thresholding was applied to mNDWI images to create a binary land-water raster for each image acquisition date. Second, water area was masked from NBLI and NDVI images, and Otsu's method was applied to the masked images to create binary bare earth-"unclassed" and vegetated-"unclassed" rasters, respectively. Because thresholding was applied to masked NBLI and NDVI simultaneously, some pixels along the sand-vegetation boundary were classed as both sand and vegetated in this step. These pixels were mapped as sand using the following rule: if NBLI = sand and NDVI = vegetated, then final = sand (based on visual analysis during workflow development) (Bernier and others, 2021). Next, water, bare earth (sand), and vegetated areas were masked from mNDWI images, and Otsu's method was applied to the masked mNDWI image to separate the "submerged" and "emergent" intertidal areas. Finally, the binary land-cover images were converted to thematic rasters, merged, and single-pixel "clumps" were removed using a 3x3 majority filter to create a final land-cover raster dataset. The resulting land-cover rasters use the naming convention YYYYMMDD_LC##_nchan_islp_lcr_ce.img, where YYYYMMDD denotes the image-acquisition date (4-digit year, 2-digit month, 2-digit day) and LC## denotes Landsat 8 (LC08) or Landsat 9 (LC09) image source. All steps were batch-processed using the Image Processing toolbox in MATLAB (Otsu thresholding and binary image creation) or Spatial Model Editor in ERDAS IMAGINE (spectral index masking and generation of classed land-cover rasters). Process_Date: 2025 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Process_Step: Process_Description: Vector shoreline (representing the boundary between intertidal and open-water areas), sand, and vegetated extents were extracted by contouring the mNDWI and masked NBLI and NDVI images using the calculated Otsu thresholds. The resulting shapefiles (one per image acquisition date) were merged into 3 shapefiles (one each for shoreline [shrln], sand [sandext], and vegetated [vegext] feature extents). Contouring was batch-processed using Python 3 Jupyter Notebooks in ArcGIS Pro. Vector features corresponding to a minimum mapping unit of less than 4 connected pixels were excluded from the final dataset. Process_Date: 2025 Source_Produced_Citation_Abbreviation: nchan_coll2_shrln_20171222_20241115.shp Source_Produced_Citation_Abbreviation: nchan_coll2_sandext_20171222_20241115.shp Source_Produced_Citation_Abbreviation: nchan_coll2_vegext_20171222_20241115.shp Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Process_Step: Process_Description: Barrier platform, beach, and vegetated widths were calculated from the intersection of the shoreline, sand, and vegetated vectors with transects spaced 300 m (10 pixels) apart alongshore. New Harbor Islands, isolated back-barrier islands that are less than 8 pixels in size, and back-barrier islands that are more than 8 pixels from the contiguous island extent were excluded from the feature metrics dataset. Transects are the same as used in Bernier and others (2021); feature intersections and along-transect widths were calculated in RStudio. Vegetated widths were not calculated along transects 56 and 57, where the oblique nature of the back-barrier marsh island, coupled with a change in baseline orientation, caused inconsistencies in delineating feature extents. Features less than 17 m wide along-transect are considered unresolvable based on the stated 12-m RMSE for Landsat L1TP products (sqrt(12^2 + 12^2) = 16.97) and were also excluded from the final dataset. Process_Date: 2025 Source_Produced_Citation_Abbreviation: nchan_perp_transects_300m.shp Source_Produced_Citation_Abbreviation: nchan_coll2_featmetrics_2017_2024.csv Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Julie C. Bernier Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: jbernier@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -87.0 Latitude_of_Projection_Origin: 0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 30 Ordinate_Resolution: 30 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: nchan_coll2_shrln_20171222_20241115.shp, nchan_coll2_sandext_20171222_20241115.shp, nchan_coll2_vegext_20171222_20241115.shp Entity_Type_Definition: Vector shoreline, sand, and vegetated feature extents in Esri shapefile (.shp) format, contained in nchan_coll2_features.zip. 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: IMG_DATE Attribute_Definition: Image acquisition date Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Source image acquisition date written as DD-MON-YYYY (2-digit day, 3-letter month, 4-digit year). Attribute: Attribute_Label: DEC_YEAR Attribute_Definition: Source image-acquisition date, in decimal years. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2017.975 Range_Domain_Maximum: 2024.873 Attribute_Units_of_Measure: Decimal year Attribute_Measurement_Resolution: 0.001 Detailed_Description: Entity_Type: Entity_Type_Label: nchan_perp_transects_300m.shp Entity_Type_Definition: Cross-shore transect locations in Esri shapefile (.shp) format, contained in nchan_coll2_features.zip. 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: Transect Attribute_Definition: Transect number Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 132 Attribute_Units_of_Measure: Dimensionless Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: StartX Attribute_Definition: UTM coordinates of transect starting x position. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 319282.942095 Range_Domain_Maximum: 325039.250404 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.000001 Attribute: Attribute_Label: StartY Attribute_Definition: UTM coordinates of transect starting y position. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3289009.250058 Range_Domain_Maximum: 3326250.763767 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.000001 Attribute: Attribute_Label: Azimuth Attribute_Definition: Azimuth of transect cast Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 48.408288 Range_Domain_Maximum: 117.397400 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.000001 Detailed_Description: Entity_Type: Entity_Type_Label: nchan_coll2_featmetrics_2017_2024.csv Entity_Type_Definition: Comma-separated values (.csv) file detailing derived feature metrics for each image-acquisition date, contained in nchan_coll2_features.zip. Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: Transect Attribute_Definition: Transect number Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 132 Attribute_Units_of_Measure: Dimensionless Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: IMG_DATE Attribute_Definition: Image acquisition date Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Source image acquisition date written as DD-MON-YYYY (2-digit day, 3-letter month, 4-digit year). Attribute: Attribute_Label: DEC_YEAR Attribute_Definition: Source image-acquisition date, in decimal years. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2017.975 Range_Domain_Maximum: 2024.873 Attribute_Units_of_Measure: Decimal year Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: SHRLN_min Attribute_Definition: Distance, in meters, along transect from baseline to first intersection with shoreline vector. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 564.520 Range_Domain_Maximum: 5072.489 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: SAND_min Attribute_Definition: Distance, in meters, along transect from baseline to first intersection with sand extent vector. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 598.141 Range_Domain_Maximum: 4957.164 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.0010 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: SAND_max Attribute_Definition: Distance, in meters, along transect from baseline to last intersection with sand extent vector. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 689.084 Range_Domain_Maximum: 5012.648 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: VEG_min Attribute_Definition: Distance, in meters, along transect from baseline to first intersection with vegetated extent vector. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 695.207 Range_Domain_Maximum: 4279.561 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: VEG_max Attribute_Definition: Distance, in meters, along transect from baseline to last intersection with vegetated extent vector. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 940.156 Range_Domain_Maximum: 4327.063 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: SHRLN_max Attribute_Definition: Distance, in meters, along transect from baseline to last intersection with shoreline vector. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 790.196 Range_Domain_Maximum: 5336.275 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: ISLP Attribute_Definition: Width, in meters, of barrier-island platform (sea shoreline to back-barrier shoreline). Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 17.614 Range_Domain_Maximum: 1461.495 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: BEACH Attribute_Definition: Width, in meters, of barrier-island beach (maximum sand extent to seaward shoreline). Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 21.429 Range_Domain_Maximum: 431.331 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Attribute: Attribute_Label: VEG Attribute_Definition: Width, in meters, of barrier-island vegetation (vegetated extent). Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 20.308 Range_Domain_Maximum: 1217.769 Attribute_Units_of_Measure: Meters Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: NoData Enumerated_Domain_Value_Definition: Feature is not present along the transect. Enumerated_Domain_Value_Definition_Source: USGS Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Excl Enumerated_Domain_Value_Definition: Feature was excluded from dataset (see process step description for additional details). Enumerated_Domain_Value_Definition_Source: USGS Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center Contact_Person: USGS SPCMSC Data Management Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: gs-g-spcmsc_data_inquiries@usgs.gov Resource_Description: nchan_coll2_shrln_20171222_20241115.shp, nchan_coll2_sandext_20171222_20241115.shp, nchan_coll2_vegext_20171222_20241115.shp, nchan_perp_transects_300m.shp, nchan_coll2_featmetrics_2017_2024.csv 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, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: shapefile, comma-delimited text Format_Information_Content: Download file contains vector sand, vegetation, shoreline, and 300m transect shapefiles (.shp) and comma-separated values (.csv) text files. Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://coastal.er.usgs.gov/data-release/doi-P9HY3HOR/data/nchan_coll2_features.zip Fees: None Technical_Prerequisites: Vector datasets were created using Esri ArcGIS Pro version 3.3.2 and can be opened using Esri ArcGIS Pro version 3.1 or higher; these data may also be viewed using free Google Earth Pro or QGIS software. Metadata_Reference_Information: Metadata_Date: 20251219 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center Contact_Person: USGS SPCMSC Data Management Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: gs-g-spcmsc_data_inquiries@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998