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**Service Description: ** Typically, shoreline change occurring over a short time span can be characterized by cyclic or episodic non-linear behavior, such as storm-induced shoreline retreat. High short-term variability increases the shoreline change rate uncertainty and the potential for rates of shoreline change that are statistically insignificant. In many locations, the short-term trend is calculated with only 3 shorelines. As noted above, uncertainty generally decreases with an increasing number of shoreline data points; thus the small number of shorelines in the short-term calculation can result in higher uncertainty. To supplement gaps in the short-term data, end point rates were calculated at each transect that did not intersect the minimum number of three shorelines required to calculate a linear regression rate. The end point rate is calculated by dividing the distance between shorelines by the time elapsed between the oldest (1983) and the most recent (2006) shoreline. End point rates represent the net change between the two shorelines divided by the elapsed time period. Unlike the linear regression method, end point rates do not have an associated expression (such as a confidence interval) of how scattered the shoreline positions are relative to an assumed linear trend.

**Map Name: ** Shoreline Change Short Term (1983 - 2006)

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**Description: ** Shorelines are continuously moving in response to winds, waves, tides, sediment supply, changes in relative sea level, and human activities. Shoreline changes are generally not constant through time and frequently switch from negative (erosion) to positive (accretion) and vice versa. Cyclic and non-cyclic processes change the position of the shoreline over a variety of timescales, from the daily and seasonal effects of winds and waves, to changes in sea level over a century to thousands of years. The shoreline "rate of change" statistic thus reflects a cumulative summary of the processes that altered the shoreline for the time period analyzed.

**Copyright Text: ** CT DEEP, UCONN, CT SeaGrant, NOAA, USGS

**Spatial Reference: **
102100
(3857)

**Single Fused Map Cache: ** false

**Initial Extent: **
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YMin: 5048450.810630198

XMax: -8034058.853263233

YMax: 5095547.543142633

Spatial Reference: 102100
(3857)

**Full Extent: **
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YMin: 5010101.029095742

XMax: -7994023.349232904

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Spatial Reference: 102100
(3857)

**Units: ** esriMeters

**Supported Image Format Types: ** PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

**Document Info: **
Title: CT Shoreline Change Viewer

Author:

Comments: Typically, shoreline change occurring over a short time span can be characterized by cyclic or episodic non-linear behavior, such as storm-induced shoreline retreat. High short-term variability increases the shoreline change rate uncertainty and the potential for rates of shoreline change that are statistically insignificant. In many locations, the short-term trend is calculated with only 3 shorelines. As noted above, uncertainty generally decreases with an increasing number of shoreline data points; thus the small number of shorelines in the short-term calculation can result in higher uncertainty. To supplement gaps in the short-term data, end point rates were calculated at each transect that did not intersect the minimum number of three shorelines required to calculate a linear regression rate. The end point rate is calculated by dividing the distance between shorelines by the time elapsed between the oldest (1983) and the most recent (2006) shoreline. End point rates represent the net change between the two shorelines divided by the elapsed time period. Unlike the linear regression method, end point rates do not have an associated expression (such as a confidence interval) of how scattered the shoreline positions are relative to an assumed linear trend.

Subject: Displays shoreline change data in various formats for short term time (1983 - 2006) horizons.

Category:

Keywords: Shoreline,Connecticut

AntialiasingMode: None

TextAntialiasingMode: Force

**Supports Dynamic Layers: ** false

**MaxRecordCount: ** 1000

**MaxImageHeight: ** 4096

**MaxImageWidth: ** 4096

**Supported Query Formats: ** JSON, AMF, geoJSON

**Min Scale: ** 1500100

**Max Scale: ** 0

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