Image_compactness is an analysis export variable available in exported integration analyses when the schools detection module is licensed.
It provides a measure of the shape of a school represented by a region on an echogram (-).
The image compactness is a statistic which measures the ratio between the perimeter (squared) of the observed school to the area of the observed school. A circle has an image compactness of 1.
See Schools detection module algorithms for a mathematical definition.
This variable is exported only if it is selected on the Export page of the EV File Properties dialog box.
Note: If the region being analyzed extends beyond the range of the available GPS data, the special export value "-1" will be exported as the Image_compactness value.
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Schools detection module algorithms