Entity_Type:
Entity_Type_Label: MarthasVineyard_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: 1
Range_Domain_Maximum: 2581
Attribute:
Attribute_Label: StartX
Attribute_Definition:
Assigned by DSAS automatically to record the X coordinate of the beginning of the transect in meter units (State Plane Masachusetts Mainland FIPS 2001, 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 (State Plane Masachusetts Mainland FIPS 2001, 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 (State Plane Masachusetts Mainland FIPS 2001, 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 (State Plane Masachusetts Mainland FIPS 2001, 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 (State Plane Masachusetts Mainland FIPS 2001, 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: 1
Range_Domain_Maximum: 810.3
Attribute:
Attribute_Label: NSM
Attribute_Definition:
Net Shoreline Movement - the distance in meters (State Plane Masachusetts Mainland FIPS 2001, 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: -810.3
Range_Domain_Maximum: 283.29
Attribute:
Attribute_Label: Shape_Leng
Attribute_Definition:
Length of feature in meter units (State Plane Masachusetts Mainland FIPS 2001, NAD 83).
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 33.423819
Range_Domain_Maximum: 969.248092
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: -5.34
Range_Domain_Maximum: 1.91
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: 0.01
Range_Domain_Maximum: 249.34
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: 0.001
Range_Domain_Maximum: 7.84