GEORECTIFIED SHORELINE IMAGES AT REHOBOTH BEACH

For 22-Nov-2009 17:58:40

MERGED TIME EXPOSURE IMAGE

3500m

2500m

1500m

500m

-500m

-1500m

-2500m

MERGED VARIANCE IMAGE

3500m

2500m

1500m

500m

-500m

-1500m

-2500m

To find the shoreline we take a weighted sum of the Timex and Variance.

A Mask is used to exclude from consideration area where we know the shoreline cannot be.

In addition, a responsive intensity stretch is used to increase the contrast around the surf zone.

3500m

2500m

1500m

500m

-500m

-1500m

-2500m

In each column the signal peak is found.

Where the signal drops below the average landward of the peak is defined as the shoreline.

3500m

2500m

1500m

500m

-500m

-1500m

-2500m

Here the resultant shoreline for this hour is drawn in red on the Timex image.