Quad Tree Related Organizations

• A Quad Tree Related organization is not required to specify data for all 4 quadrants - that is, it may have fewer than 4 branches. In this example, the northeast quadrant is underwater, so a <Quad Tree Related Features> concerned with dry land terrain might have no data for that quadrant.

• Note that a Quad Tree Related organization is not required to be a "pure" quad tree in the classic sense - its components may or may not be Quad Tree Related organizations.

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