미국
Cottonwood Lake Study Area-Wetland Vegetation Zones-1980
Spatial polygons of vegetation zones in 1980 for wetlands; P1, P2, P3, P4, P7, P8, T3, T4, T5, 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 1980 using Stewart and Kantrud classification system.