A quadrat is a frame used in ecology, geography, and biology to isolate a standard unit of area for study of the distribution of an item over a large area.
https://en.wikipedia.org/wiki/Quadrat
A quadrat is a frame used in ecology, geography, and biology to isolate a standard unit of area for study of the distribution of an item over a large area.
https://en.wikipedia.org/wiki/Quadrat