Table 1.

Feature indices for canopy shape and density.

Feature index	Description
Euler number	A scalar that specified the number of holes in the region minus the objects in the region
Entropy	A scalar that characterized the aggregation characteristics of the image's gray distribution. An image with more details and larger changes in brightness, as in an open canopy, has a higher entropy value.
Cluster count	The number of connected objects found in binary image
Mean area	The mean area of the connected objects.