미국
Cottonwood Lake Study Area-Wetland Vegetation Zones-1987
Spatial polygons of vegetation zones in 1987 for wetlands; P1, P2, P4, P8, T2, T3, T4, T5, T6, T7, T8, and T9 within the Cottonwood Lake Study Area, Stutsman County, North Dakota. Created from a collection of digital orthorectified images from aerial photographs of the study area acquired during 1987 using Stewart and Kantrud classification system.