NorthShore_transects_rates_LTw.shp - Digital Shoreline Analysis System version 4.3 transects and long-term linear regression shoreline change statistics for all data available in the North Shore coastal region from North Salisbury at the New Hampshire border to the to the west side of Deer Island in Boston Harbor

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 2013

Title:

NorthShore_transects_rates_LTw.shp - Digital Shoreline Analysis System version 4.3 transects and long-term linear regression shoreline change statistics for all data available in the North Shore coastal region from North Salisbury at the New Hampshire border to the to the west side of Deer Island in Boston Harbor

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2012-1183

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:

<http://pubs.usgs.gov/of/2012/1183/data/NorthShore/NorthShore_transects_rates_LTw.zip>

Larger_Work_Citation:

Citation_Information:

Originator: Theresa L. Smith

Originator: Emily A. Himmelstoss

Originator: E. Robert Thieler

Publication_Date: 2013

Title:

Massachusetts Shoreline Change Project: A GIS Compilation of Vector Shorelines and Associated Shoreline Change Data for the 2013 update

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2012-1183

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: <http://pubs.usgs.gov/of/2012/1183/>

Description:

Abstract:

Due to continued coastal population growth and increased threats of erosion, current data on trends and rates of shoreline movement are required to inform shoreline and floodplain management. The Massachusetts Office of Coastal Zone Management launched the Shoreline Change Project in 1989 to identify erosion-prone areas of the coast. In 2001, a 1994 shoreline was added to calculate both long- and short-term shoreline change rates at 40-meter intervals along ocean-facing sections of the Massachusetts coast.

The Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) in cooperation with the Massachusetts Office of Coastal Zone Management, has compiled reliable historical shoreline data along open-facing sections of the Massachusetts coast under the Massachusetts Shoreline Change Mapping and Analysis Project 2013 Update. Two oceanfront shorelines for Massachusetts (approximately 1,800 km) were (1) delineated using 2008/09 color aerial orthoimagery, and (2) extracted from topographic LIDAR datasets (2007) obtained from NOAA's Ocean Service, Coastal Services Center. The new shorelines were integrated with existing Massachusetts Office of Coastal Zone Management and USGS historical shoreline data in order to compute long- and short-term rates using the latest version of the Digital Shoreline Analysis System (DSAS).

Purpose:

This dataset consists of long-term (100+ years) linear regression shoreline change rates for the North Shore region of Massachusetts. Rates of long-term shoreline change 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. The baseline is used as a reference line for the transects cast by the DSAS software. The transects intersect each shoreline at the measurement points, which are then used to calculate a linear regression rate for the Massachusetts Office of Coastal Zone Management Shoreline Change Project. Long-term linear regression statistics were calculated with all of the historical shorelines compiled for the Massachusetts Office of Coastal Zone Management Shoreline Change Project.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2013

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -70.992217

East_Bounding_Coordinate: -70.590412

North_Bounding_Coordinate: 42.874743

South_Bounding_Coordinate: 42.343497

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: Esri polyline shapefile

Theme_Keyword: Shoreline

Theme_Keyword: Historic Shoreline

Theme_Keyword: long-term

Theme_Keyword: Shoreline Change Rate

Theme_Keyword: Erosion

Theme_Keyword: Accretion

Theme_Keyword: Shoreline Change Envelope

Theme_Keyword: SCE

Theme_Keyword: Net Shoreline Movement

Theme_Keyword: NSM

Theme_Keyword: Linear Regression Rate

Theme_Keyword: LRR

Theme_Keyword: Baseline

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: Massachusetts Office of Coastal Zone Management

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: oceans

Theme_Keyword: oceans and estuaries

Theme_Keyword: oceans and coastal

Theme_Keyword: geoscientificInformation

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Atlantic Coast

Place_Keyword: United States

Place_Keyword: New England

Place_Keyword: Massachusetts

Place_Keyword: North Shore

Place_Keyword: Salisbury

Place_Keyword: Gloucester

Place_Keyword: Deer Island

Place_Keyword: Boston Harbor

Access_Constraints: None

Use_Constraints:

These data were automatically generated using the DSAS versions 4.2 (transects) and 4.3 (rates) software applications and should only be used for purposes explicitly stated by the originating organization. Please recognize the U.S. Geological Survey (USGS) and the Massachusetts Office of Coastal Zone Management as the originators of this dataset.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Theresa Smith

Contact_Position: Contract Geologist

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: theresasmith@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.1850

Cross_Reference:

Citation_Information:

Originator: E.R. Thieler

Originator: T.L. Smith

Originator: Julia Knisel

Originator: D.W. Sampson

Publication_Date: 2013

Title:

Massachusetts Shoreline Change Mapping and Analysis Project, 2013 Update

Series_Information:

Series_Name: Open-File Report

Issue_Identification: 2012-1189

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: <http://pubs.usgs.gov/of/2012/1189/>

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: Woods Hole Coastal and Marine Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey, Coastal and Marine Geology Program

Other_Citation_Details: Current version is 4.3

Online_Linkage:

<http://woodshole.er.usgs.gov/project-pages/dsas/version4/index.html>

Online_Linkage: <http://woodshole.er.usgs.gov/project-pages/dsas/>

Online_Linkage: <http://pubs.usgs.gov/of/2008/1278/>

Cross_Reference:

Citation_Information:

Originator: E. Robert Thieler

Originator: James F. O'Connell

Originator: Courtney A. Schupp

Publication_Date: 20010904

Title:

The Massachusetts Shoreline Change Project: 1800s to 1994 Technical Report

Series_Information:

Series_Name: Administrative Report

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: <http://www.mass.gov/czm/hazards/pdf/sc_technical_report.pdf>

Online_Linkage:

<http://www.mass.gov/czm/hazards/shoreline_change/shorelinechangeproject.htm>

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 transect data were generated using DSAS v.4.2 and the rates were calculated using DSAS v.4.3, 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 long-term shoreline change rates for the region. Additional transects may have been generated but did not intersect the minimum requirement of three shorelines to calculate linear regression long-term rates. These data are part of a state-wide assessment of shoreline change that includes over 26,500 individual transect locations that were used to compute both short- and long-term rates of change, based on almost 9200 linear kilometers of historical shoreline position data. It is very likely that some gross errors or blunders were introduced during compilation and analysis of this large amount of information. Such errors have been described in the context of shoreline change mapping as coarse errors (Fenster and others, 2001) and can generally be considered to affect only a very small percentage of the overall dataset.

Fenster, M.S., Dolan, R., and Morton, R.A., 2001, Coastal storms and shoreline change: signal or noise?: Journal of Coastal Research, v. 17, no. 3, p. 714-720.

Lineage:

Process_Step:

Process_Description:

Transect Features Generated using DSAS v.4.2 in ArcGIS 9.3. Parameters Used: baseline layer=NorthShore_baseline, baseline group field=NULL, transect spacing=50 meters, transect length=200 meters, cast direction=AUTO-DETECT, baseline location=on/off shore, cast method= smoothed baseline, smoothing distance=250 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 USGS website at: <http://pubs.usgs.gov/of/2008/1278/>.

This process step and all subsequent process steps were performed by Theresa Smith.

Process_Date: 20110922

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Theresa Smith

Contact_Organization: U.S. Geological Survey

Contact_Position: Contract Geologist

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: theresasmith@usgs.gov

Process_Step:

Process_Description:

After transects were generated, it was necessary to edit sections of the baseline using the dynamic topology in DSAS that allows edits to the baseline in a standard ArcMap (v9.3) editing session to update the position of transects if the transect field is enabled in as the target layer in the DSAS (v4.2) toolbar.

Process_Date: 20110922

Process_Step:

Process_Description:

After transects were generated, the entire geodatabase was upgraded to v.10 by right-clicking on the geodatabase and choosing Properties from the pop-up window in ArcCatalog v.10. The Upgrade Geodatabase button was clicked at the bottom of the General tab in the Database Properties window.

Process_Date: 20120206

Process_Step:

Process_Description:

The bias and uncertainty data associated with the 2000 lidar shoreline were previously published by the USGS (OFR 2012-1119) and are organized in two separate files for the North Shore region boundaries of this study (NewEnglandN_shorelines_uncertainty.dbf and GreaterBoston_shorelines_uncertainty.dbf ). Therefore, the rate calculations were run twice (once for each uncertainty table) to compute a complete set of bias-corrected rates for the North Shore region.

The NewEnglandN_shorelines_uncertainty.dbf file and the GreaterBoston_shorelines_uncertainty.dbf files were imported to the geodatabase containing the North Shore data. The tables were renamed to match the corresponding shoreline shapefiles (NewEnglandN_shorelines_uncertainty.dbf was renamed NorthShoreA_shorelines_uncertainty.dbf, and GreaterBoston_shorelines_uncertainty.dbf was renamed NorthShoreB_shorelines_uncertainty).

Rate Calculations Performed using DSAS v4.3 for the North Shore A subregion. Parameters Used: shoreline layer=NorthShoreA_shorelines, shoreline date field=Date_, shoreline uncertainty field name=Uncy (additional shoreline data stored in NorthShoreA_shoreline_uncertainty.dbf), the default accuracy=10.8 meters, shoreline intersection parameters=nearest, stats calculations=[Shoreline Change Envelope (SCE), Net Shoreline Movement (NSM), Linear Regression Rate (LRR)], shoreline threshold=3, confidence interval=90%, Output rate table name=NorthShoreA_transects_rates_20121017_092902.dbf.

Process_Date: 20121017

Process_Step:

Process_Description:

The shoreline rates output table for the North Shore A section (NorthShoreA_transects_rates_20121017_092902.dbf) was joined to the transect feature class in ArcMap v.10 by right-clicking on the transect layer > joins and relates > join > join attributes from a table. Parameters: join field - ObjectID; table to join - NorthShoreA_transects_rates_20121017_092902; field in table: TransectID; join options - keep only matching records.

Process_Date: 20121017

Process_Step:

Process_Description:

The joined data were exported to a shapefile in ArcMap v.10 by right-clicking the transect file, choosing data > export data. The new shapefile was named NorthShore_transects_rates_LTw.shp and permanently adds the joined rate fields to the transect attribute table. The new shapefile was added to ArcMap and the attribute field was displayed. Transects 923-3957 were deleted from the file, as they extend outside the North Shore A subregion.

Process_Date: 20121017

Process_Step:

Process_Description:

Due to the lack of continuous long-term shoreline position data, some transects intersected shorelines from 1970-2009, but did not intersect shorelines prior to 1970, which resulted in long-term linear regression rates that were identical to short-term linear regression rates. A filter was applied to the transect/rates data in ArcMap v10: 1) Select by Attributes > create new selection: SELECT FROM NorthShoreA_shorelines.shp WHERE [Year] >=1970; and 2) Select by Location, Target layer: NorthShoreA_transects_rates_LTw.shp, Source layer: NorthShoreA_shorelines.shp, parameters: use selected features spatial selection method: Target layer(s) features intersect the source layer feature). Transects that did not intersect long-term shoreline data (1844-1969) were deleted in a standard editing session (ArcMAP v10).

Process_Date: 20121017

Process_Step:

Process_Description:

Rate Calculations Performed using DSAS v4.3 for ArcMap v.10 for the North Shore B subregion. Parameters Used: shoreline layer=NorthShoreB_shorelines, shoreline date field=Date_, shoreline uncertainty field name=Uncy (additional shoreline data stored in NorthShoreB_shorelines_uncertainty.dbf), the default accuracy=10.8 meters, shoreline intersection parameters=nearest, stats calculations=[Shoreline Change Envelope (SCE), Net Shoreline Movement (NSM), Linear Regression Rate (LRR)], shoreline threshold=3, confidence interval=90%, Output rate table name=NorthShoreB_transects_rates_20121017_103913.dbf.

Process_Date: 20121017

Process_Step:

Process_Description:

Shoreline rates output table for the North Shore B section (NorthShoreB_transects_rates_20121017_103913.dbf) was joined to the transect feature class in ArcMap v.10 by right-clicking on the transect layer > joins and relates > join > join attributes from a table. Parameters: join field - ObjectID; table to join - NorthShoreB_transects_rates_20121017_103913; field in table: TransectID; join options - keep only matching records.

Process_Date: 20121017

Process_Step:

Process_Description:

The joined data were exported to a shapefile in ArcMap v.10 by right-clicking the transect file, choosing data > export data. The new shapefile was named NorthShoreB_transects_rates_LTw.shp and permanently adds the joined rate fields to the transect attribute table. The new shapefile was added to ArcMap and the attribute field was displayed. Transects 1-922 were deleted from the file, as they extend outside the North Shore B subregion.

Process_Date: 20121017

Process_Step:

Process_Description:

Due to the lack of continuous long-term shoreline position data, some transects intersected shorelines from 1970-2009, but did not intersect shorelines prior to 1970, which resulted in long-term linear regression rates that were identical to short-term linear regression rates. A filter was applied to the transect/rates data in ArcMap v10: 1) Select by Attributes > create new selection: SELECT FROM NorthShoreB_shorelines.shp WHERE [Year] >=1970; and 2) Select by Location, Target layer: NorthShoreB_transects_rates_LTw.shp, Source layer: NorthShoreB_shorelines.shp, parameters: use selected features spatial selection method: Target layer(s) features intersect the source layer feature). Transects that did not intersect long-term shoreline data (1844-1969) were deleted in a standard editing session (ArcMAP v10).

Process_Date: 20121116

Process_Step:

Process_Description:

The NorthShoreA_transects_rates_LTw and NorthShoreB_transects_rates_LTw feature classes were exported from the personal geodatabase back to a shapefile in ArcCatalog (v.10) by right-clicking on one of the rates files > Export > To Shapefile (multiple). The shapefiles were then merged in Esri's ArcToolbox (v.10), Data Management Tools > General > Merge, to produce one set of results for display and publication purposes encompassing the whole extent of the North Shore region. The file was renamed NorthShore_transects_rates_LTw.shp

Process_Date: 20121116

Process_Step:

Process_Description:

The merged transect shapefile was projected in Esri's ArcToolbox (v.10) > Data Management Tools > Projections and Transformations > Feature > Project. Parameters: input projection - NAD_1983_StatePlane_Massachusetts_Mainland_FIPS_2001; output projection - geographic coordinates (NAD83); transformation - none.

Process_Date: 20121116

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: 3932

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: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: NorthShore_transects_rates_LTw

Entity_Type_Definition:

Measurement transects and resulting long-term linear regression rate calculations

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 used within geodatabase.

Attribute_Definition_Source: Esri

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: 0

Range_Domain_Maximum: unlimited

Attribute:

Attribute_Label: TransOrder

Attribute_Definition:

Assigned by DSAS on the basis of transect order along the baseline or baselines. This field provides the user with a method to sort transect data from the start of the baseline segment with an ID=1 and increment sequentially to the end of the final baseline segment.

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2

Range_Domain_Maximum: 3957

Attribute:

Attribute_Label: StartX

Attribute_Definition:

Assigned by DSAS automatically to record the X coordinate of the beginning of the transect in meter units (MA State Plane, NAD 83).

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 (MA State Plane, NAD 83).

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 (MA State Plane, NAD 83).

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 (MA State Plane, NAD 83).

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.

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 360

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: SCE

Attribute_Definition:

Shoreline Change Envelope the distance in meters (MA State Plane, NAD 83) calculated by DSAS between the shoreline farthest from and closest to the baseline.

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.58

Range_Domain_Maximum: 745.07

Attribute:

Attribute_Label: NSM

Attribute_Definition:

Net Shoreline Movement - the distance in meters (MA State Plane, NAD 83) calculated by DSAS between the oldest and youngest shorelines for each transect. If negative, the youngest shoreline is landward of the oldest (erosional), if positive, the youngest is seaward of the oldest (accretional).

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -274.64

Range_Domain_Maximum: 645.57

Attribute:

Attribute_Label: Shape_Leng

Attribute_Definition: Length of feature in meter units (MA State Plane, NAD 83).

Attribute_Definition_Source: U.S. Geological Survey

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 29.084729

Range_Domain_Maximum: 792.47129

Attribute:

Attribute_Label: LRR

Attribute_Definition:

Linear Regression Rate- 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 best-fit 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: -2.25

Range_Domain_Maximum: 4.23

Attribute:

Attribute_Label: LR2

Attribute_Definition:

R-squared statistic, or coefficient of determination of linear regression, is the variance in the data calculated by DSAS that is explained by a regression. It is a dimensionless statistic that ranges from 1.0 to 0.0 and measure how successfully the best-fit line accounts for variation in the data. R-squared values close to 1.0 imply that the best-fit line explains most of the variation in the dependent variable. R-squared values close to 0.0 implies that the best-fit line explains little of the variation in the dependent variable and may not be a useful model.

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

Range_Domain_Maximum: 231.87

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

Range_Domain_Maximum: 9.67

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

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

Resource_Description: Downloadable data.

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: WinZip

Format_Version_Number: 14

Format_Specification: Esri polyline shapefile

Format_Information_Content:

This WinZip file contains a shapefile of transects generated by the Digital Shoreline Analysis System including long-term linear regression rate calculations for the North Shore region of Massachusetts. Metadata is also included.

File_Decompression_Technique: Use WinZip or pkUnzip

Transfer_Size: 387.10 KB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<http://pubs.usgs.gov/of/2012/1183/data/NorthShore/NorthShore_transects_rates_LTw.zip>

Access_Instructions: Data may be downloaded via the World Wide Web (WWW).

Fees: None

Technical_Prerequisites:

This zip file contains data available in Environmental Systems Research Institute (Esri) polyline shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.esri.com.

Metadata_Reference_Information:

Metadata_Date: 20121112

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Theresa Smith

Contact_Organization: U.S. Geological Survey

Contact_Position: Contract Geologist

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: theresasmith@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile