Margins of Error

Connecticut Shoreline Change Analysis – Margins of Error

Margins of error play a large role in generating some of the statistical output, but also helped in the data quality reviews.  Comparing shoreline data and their margins of error to the general trend of the shoreline from aerial photos provided a reasonable way to assess “goodness of fit.”  Areas that within margins of error were retained; those that varied beyond the margins of error were omitted.  The examples below illustrate this; the blue line represents the shoreline and the pink area defines the margin of error where the  shoreline could have been.

modeled boundaries fit well with actual

Here, the boundaries match reasonably well with shoreline features from the photo.

modeled boundaries do not fit well with actual

Here, portions of the boundary and shoreline do not match well with shoreline from the photo. These were eliminated.

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