For example, beaches and urban concrete share the common main ingredient of sand, and sometimes they will show similar spectrum reflections. To a satellite, fallow rice paddy and aquaculture ponds can often look the same.
例如海岸地的沙灘和都市的水泥地，基本成分都是沙，有時會呈現相似的光譜反應；休耕的水稻田和魚塭在衛星的眼裡，也可能看起來差不多。