미국
Cottonwood Lake Study Area-Wetland Vegetation Zones-1977
Spatial polygons of vegetation zones in 1977 for wetlands; P1, P2, P4, 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 1977 using Stewart and Kantrud classification system.