Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2017 Title: Digital Shoreline Analysis System version 4.3 Transects with Short-Term Linear Regression Rate Calculations for Alabama Edition: 1 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F78P5XNK 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/F78P5XNK Online_Linkage: https://www.sciencebase.gov/catalog/item/582ca49de4b04d580bd378dc Online_Linkage: https://www.sciencebase.gov/catalog/file/get/582ca49de4b04d580bd378dc Larger_Work_Citation: Citation_Information: Originator: E.A. Himmelstoss Originator: M.G. Kratzmann Originator: E.R. Thieler Publication_Date: 2017 Title: National Assessment of Shoreline Change— A GIS compilation of Updated Vector Shorelines and Associated Shoreline Change Data for the Gulf of Mexico Coast Edition: 1 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F78P5XNK Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F78P5XNK Online_Linkage: https://www.sciencebase.gov/catalog/item/58055db4e4b0824b2d1c1ee2 Description: Abstract: Sandy ocean beaches are a popular recreational destination, often surrounded by communities containing valuable real estate. Development is on the rise despite the fact that coastal infrastructure is subjected to flooding and erosion. As a result, there is an increased demand for accurate information regarding past and present shoreline changes. To meet these national needs, the Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) is compiling existing reliable historical shoreline data along open-ocean sandy shores of the conterminous United States and parts of Alaska and Hawaii under the National Assessment of Shoreline Change project. There is no widely accepted standard for analyzing shoreline change. Existing shoreline data measurements and rate calculation methods vary from study to study and prevent combining results into state-wide or regional assessments. The impetus behind the National Assessment project was to develop a standardized method of measuring changes in shoreline position that is consistent from coast to coast. The goal was to facilitate the process of periodically and systematically updating the results in an internally consistent manner. Purpose: This dataset consists of short-term (~30-year) shoreline change rates for the Alabama coastal region from the Florida border to Dauphin Island. Rate calculations were computed within a GIS using the Digital Shoreline Analysis System (DSAS) version 4.3, an ArcGIS extension developed by the U.S. Geological Survey. Short-term rates of shoreline change were calculated using a linear regression rate where three or more shorelines exist in the dataset for the short-term time period (1960 and later). The shoreline data must cover a distance greater than 1 kilometer to be included. A reference baseline was used as the originating point for the orthogonal transects cast by the DSAS software. The transects intersect each shoreline establishing measurement points, which are then used to calculate short-term rates. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -87.556004 East_Bounding_Coordinate: -87.518270 North_Bounding_Coordinate: 30.288080 South_Bounding_Coordinate: 30.271509 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:582ca49de4b04d580bd378dc Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Short-Term Shoreline Change Rate Theme_Keyword: Shoreline Theme_Keyword: Historic Shoreline Theme_Keyword: Erosion Theme_Keyword: Accretion Theme_Keyword: Linear Regression Rate Theme_Keyword: Transect Theme_Keyword: Digital Shoreline Analysis System Theme_Keyword: DSAS Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: National Assessment of Shoreline Change Project Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: environment Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords Theme_Keyword: effects of coastal change Theme_Keyword: coastal processes Theme_Keyword: shoreline accretion Theme_Keyword: shoreline erosion Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: coastal processes Theme_Keyword: erosion Theme_Keyword: shoreline accretion Place: Place_Keyword_Thesaurus: None Place_Keyword: Alabama Place_Keyword: AL Place_Keyword: Orange Beach Place_Keyword: Gulf Shores Place_Keyword: Fort Morgan Place_Keyword: Dauphin Island Place_Keyword: Gulf of Mexico Place_Keyword: United States Place_Keyword: North America Access_Constraints: None Use_Constraints: 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 originator of the dataset. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: E.A. Himmelstoss Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: ehimmelstoss@usgs.gov Native_Data_Set_Environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.0.4.4000 Cross_Reference: Citation_Information: Originator: Robert A. Morton Originator: Tara L. Miller Originator: Laura J. Moore Publication_Date: 2004 Title: National Assessment of Shoreline Change: Part 1 Historical Shoreline Changes and Associated Coastal Land Loss along the U.S. Gulf of Mexico Series_Information: Series_Name: Open-File Report Issue_Identification: 2004-1043 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://pubs.usgs.gov/of/2004/1043/ Cross_Reference: Citation_Information: Originator: E.R. Thieler Originator: E.A. Himmelstoss Originator: J.L. Zichichi Originator: A. Ergul Publication_Date: 2009 Title: Digital Shoreline Analysis System (DSAS) version 4.0 - An ArcGIS extension for calculating shoreline change Series_Information: Series_Name: Open-File Report Issue_Identification: 2008-1278 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Current version of software at time of use was 4.3 Online_Linkage: https://woodshole.er.usgs.gov/project-pages/DSAS/version4/ Online_Linkage: https://woodshole.er.usgs.gov/project-pages/DSAS/ Cross_Reference: Citation_Information: Originator: E.A. Himmelstoss Originator: M.G. Kratzmann Originator: E.R. Thieler Publication_Date: 2017 Title: National Assessment of Shoreline Change: Summary Statistics for Updated Vector Shorelines and Associated Shoreline Change Data for the Gulf of Mexico and Southeast Atlantic Coasts Series_Information: Series_Name: Open-File Report Issue_Identification: 2017-1015 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ofr20171015 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The attributes of this dataset are based on the field requirements of the Digital Shoreline Analysis System and were automatically generated by the software during the generation of the transect layer or during the calculation of shoreline change rates performed by the software. Logical_Consistency_Report: These data were generated using DSAS v4.3, an automated software program which does not perform checks for fidelity of the input features. The transects were visually inspected and sometimes manually adjusted within a standard ArcMap edit session to adjust the position at which an individual transect intersected the shorelines. Completeness_Report: This dataset contains the transects automatically generated by the DSAS software application that were used to calculate linear regression short-term (~30-year) shoreline change rates for the region. Additional transects may have been generated but did not intersect the shoreline dates specified at the required alongshore threshold to calculate linear regression short-term rates. Lineage: Process_Step: Process_Description: Transect features generated using DSAS v4.3 in ArcMap 10.0. Parameters Used: baseline layer=AL_baseline, baseline group field=NULL, transect spacing=50 meters, transect length=1000 meters, cast direction=AUTO-DETECT, baseline location=offshore, cast method=smoothed, smoothing distance=2500 meters, flip baselines=not selected. For additional details on these parameters, please see the DSAS help file distributed with the DSAS software, or visit the website at: https://woodshole.er.usgs.gov/project-pages/DSAS/version4/ This process step and all subsequent process steps were performed by the same person: E.A. Himmelstoss. Process_Date: 20130627 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: E.A. Himmelstoss Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2262 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: ehimmelstoss@usgs.gov Process_Step: Process_Description: Some transects were manually edited for length, moved, or deleted in an edit session using standard editing tools in ArcMap v10.0. Process_Date: 20130627 Process_Step: Process_Description: Rate calculations performed in DSAS v4.3 using ArcMap v10.0 on selected shoreline features only (Select by Attributes, [Year]>=1960) with the following criteria: 1) they contained three or more shorelines required to compute short-term linear regression shoreline change analysis (a shoreline from the 1960s-70s, the modern (lidar-derived or 1990s) shoreline, and at least one other shoreline from the 1960s to present); 2) they contained the two minimum shorelines required to compute short-term end point shoreline change analysis (a shoreline from the 1960s-70s and the modern (lidar-derived or 1990s) shoreline). In Alabama, the shoreline date range for short-term linear regression rates is 1976 to 2001. Shoreline uncertainty table added to ArcMap project (AL_shorelines_uncertainty.dbf) and used by DSAS to apply bias-correction to distance measurements established by transects. Parameters Used: shoreline layer=AL_shorelines, shoreline date field=Date_, shoreline uncertainty field name=Uncy, the default uncertainty=5.1 meters, shoreline intersection parameters=closest, stats calculations=[End Point Rate (EPR), Linear Regression Rate (LRR)], shoreline threshold=2, confidence interval=90%, Output rate table name=AL_ST_rates_20130627_135334. Process_Date: 20130627 Process_Step: Process_Description: Shoreline rates table (AL_ST_rates_20130627_135334.dbf) was joined to the transect feature class in ArcMap v10.0 by right-clicking on the transect layer > joins and relates > join > join attributes from a table. Parameters: join field - ObjectID; table to join - AL_ST_rates_20130627_135334; field in table: TransectID; join options - keep only matching records. Process_Date: 20130627 Process_Step: Process_Description: Transects containing linear regression rates in the joined transect feature class were selected and exported to a shapefile (AL_STlrr_rates.shp) in ArcMap v10.0 by right-clicking the transect layer > data > export data, permanently linking the joined rate fields to the transect attribute table. Superfluous fields in the linear regression rates shapefile pertaining to the end point rate method were deleted. Linear regression rates are reported with preference when both rate types exist for a given transect. Process_Date: 20130627 Process_Step: Process_Description: Any transects that did not cross the lidar shoreline were deleted using standard editing tools in ArcMap v10.0. Process_Date: 20130627 Process_Step: Process_Description: The short-term linear regression rate transects were visually compared with the short-term end point rate transects in an ArcMap session. Each set of transects was assigned a different color and the short-term linear regression rate transects were manually deleted for any stretch of alongshore coast that had fewer than 90% coverage for a 1 kilometer stretch (18 or more transects out of 20 for 50-meter spacing). In other words there will only be 1 kilometer or larger spans of short-term rate calculations for a given rate metric (end point rate or linear regression rate). Process_Date: 20130627 Process_Step: Process_Description: The exported transect shapefile was projected in Esri's ArcToolbox (v.10.0) > Data Management Tools > Projections and Transformations > Feature > Project. Parameters: input projection - UTM zone 16N (WGS 1984); output projection = geographic coordinates (WGS84); transformation = none. Process_Date: 2015 Process_Step: Process_Description: Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Process_Date: 20170825 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Alan O. Allwardt Contact_Position: Contractor -- Information Specialist Contact_Address: Address_Type: mailing and physical address Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7551 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: aallwardt@usgs.gov Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20200810 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: String Point_and_Vector_Object_Count: 70 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: AL_STlrr_rates Entity_Type_Definition: Transects were automatically generated by DSAS at a 90 degree angle to the user-specified baseline using a smoothing algorithm to maintain roughly parallel transects that are orthogonal with respect to the baseline. 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: OBJECTID Attribute_Definition: Internal feature number generated for each row of the transect attribute table when stored as a feature class in a geodatabase. This value is the common attribute field when joining to the TransectID value in short-term results output table calculated by DSAS. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: BaselineID Attribute_Definition: Unique identification number of the baseline segment. If BaselineID=0 no transects will be generated. Used by DSAS to determine transect ordering alongshore if multiple baseline segments exist. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: unlimited Attribute: Attribute_Label: TransOrder Attribute_Definition: Assigned by DSAS based on ordering of transects along the baseline. Used to allow user to sort transect data along the baseline from baseline start to baseline end. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: unlimited Attribute: Attribute_Label: ProcTime Attribute_Definition: Assigned by DSAS automatically to record the date and time a transect was processed. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: no value or 0 (when transect was manually created by user) Range_Domain_Maximum: unlimited (values based on time and date of automatic generation) Attribute: Attribute_Label: Autogen Attribute_Definition: Assigned by DSAS to indicate whether or not a transect was automatically created by DSAS (1= transect was auto generated by DSAS; blank or 0=transect was not auto-generated). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: blank or 0 Range_Domain_Maximum: 1 Attribute: Attribute_Label: StartX Attribute_Definition: Assigned by DSAS automatically to record the X coordinate of the beginning of the transect in meter units . If a transect position has been adjusted during the editing process, the coordinate in the attribute table is not updated automatically. This field was manually updated using Data East XTools v.10.2 to reflect the new position of any adjusted transects. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Values based on data set extent. Attribute: Attribute_Label: StartY Attribute_Definition: Assigned by DSAS automatically to record the Y coordinate of the beginning of the transect in meter units. If a transect position has been adjusted during the editing process, the coordinate in the attribute table is not updated automatically. This field was manually updated using Data East XTools v.10.2 to reflect the new position of any adjusted transects. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Values based on data set extent. Attribute: Attribute_Label: EndX Attribute_Definition: Assigned by DSAS automatically to record the X coordinate of the end of the transect in meter units. If a transect position has been adjusted during the editing process, the coordinate in the attribute table is not updated automatically. This field was manually updated using Data East XTools v.10.2 to reflect the new position of any adjusted transects. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Values based on data set extent. Attribute: Attribute_Label: EndY Attribute_Definition: Assigned by DSAS automatically to record the Y coordinate of the end of the transect in meter units. If a transect position has been adjusted during the editing process, the coordinate in the attribute table is not updated automatically. This field was manually updated using Data East XTools v.10.2 to reflect the new position of any adjusted transects. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Values based on data set extent. Attribute: Attribute_Label: Azimuth Attribute_Definition: Assigned by DSAS to record the azimuth of the transect measure in degrees clockwise from North. If a transect position has been adjusted during the editing process, the azimuth value in the attribute table is not updated automatically. This field was manually updated using ArcToolbox > Spatial Statistics Tools > Measuring Geographic Distributions > Linear Directional Mean to reflect the new azimuth of any adjusted transects (lines were calculated individually). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 360 Attribute_Units_of_Measure: degrees Attribute: Attribute_Label: SHAPE_Leng Attribute_Definition: Length of feature in meter units (UTM zone 16N, WGS 84). Attribute_Definition_Source: Esri Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 999.999997 Range_Domain_Maximum: 1000.000003 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: TransectId Attribute_Definition: Same value as ObjectID. Used as a permanent and unique identification number for each transect in the output rates table calculated by DSAS. This attribute was used as the common field when joining the rates table (.dbf) to the transect feature class in a geodatabase. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: LRR Attribute_Definition: A linear regression rate-of-change statistic was calculated by fitting a least-squares regression line to all shoreline points for a particular transect. The best-fit regression line is placed so that the sum of the squared residuals (determined by squaring the offset distance of each data point from the regression line and adding the squared residuals together) is minimized. The linear regression rate is the slope of the line. The rate is reported in meters per year with positive values indicating accretion and negative values indicating erosion. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.08 Range_Domain_Maximum: 4.12 Attribute_Units_of_Measure: meters per year Attribute: Attribute_Label: LR2 Attribute_Definition: The R-squared statistic, or coefficient of determination, is the percentage of variance in the data that is explained by a regression. It is a dimensionless index that ranges from 1.0 to 0.0 and measures how successfully the best-fit line accounts for variation in the data. The smaller the variability of the residual values around the regression line relative to the overall variability, the better the prediction (and closer the R-squared value is to 1.0). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 1 Attribute: Attribute_Label: LSE Attribute_Definition: The predicted (or estimated) values of y (the distance from baseline in meters) are computed for each shoreline point by using the values of x (the shoreline date) and solving the equation for the best-fit regression line (y=mx+b). The standard error is also called the standard deviation. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.08 Range_Domain_Maximum: 15.19 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: LCI90 Attribute_Definition: The standard error of the slope with confidence interval describes the uncertainty of the reported rate. The LRR rates are determined by a best-fit regression line for the shoreline data at each transect. The slope of this line is the reported rate of change (in meters/year). The confidence interval (LCI) is calculated by multiplying the standard error (also called the standard deviation) of the slope by the two-tailed test statistic at the user-specified 90 percent confidence. This value is often reported in conjunction with the slope to describe the confidence of the reported rate. For example: LRR = 1.2 LCI90 = 0.7 could be reported as a rate of 1.2 (+/-) 0.7 meters/year. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.027 Range_Domain_Maximum: 4.796 Attribute_Units_of_Measure: meters Overview_Description: Entity_and_Attribute_Overview: The entity and attribute information provided here describes the tabular data associated with the dataset. Please review the individual attribute descriptions for detailed information. All calculations for length are in meter units and were based on the UTM zone 16N (WGS 1984) projection. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center Address: Building 810 Address: MS 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile Format_Version_Number: ArcGIS 10.0 Format_Specification: Esri polyline shapefile Format_Information_Content: These files (.cpg, .dbf, .prj, .sbn, .sbx, .shp, .shp.xml, and .shx) are a collection of files with a common filename prefix and must be downloaded and stored in the same directory. Together they are the components of the shapefile and include FGDC compliant metadata. File_Decompression_Technique: no compression applied Transfer_Size: 0.026 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/582ca49de4b04d580bd378dc Network_Resource_Name: https://www.sciencebase.gov/catalog/item/582ca49de4b04d580bd378dc Network_Resource_Name: https://www.sciencebase.gov/catalog/item/58055db4e4b0824b2d1c1ee2 Network_Resource_Name: https://doi.org/10.5066/F78P5XNK Access_Instructions: The first link downloads the contents of the data page as a zip file, the second link is to the landing page of the data, the third and fourth links are to the main landing page of the data release. Fees: None Technical_Prerequisites: This zip file contains data available in a polyline shapefile format. The user must have software to read and process the data file. Metadata_Reference_Information: Metadata_Date: 20200810 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: E.A. Himmelstoss Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2262 Contact_Facsimile_Telephone: 508-547-2310 Contact_Electronic_Mail_Address: ehimmelstoss@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time