Littlefield Lake Boundary (polygon) - Edge of water at lake-surface elevations, 1293.6 ft above NAVD 88 for main lake and 1296.9 ft above NAVD88 upstream of siltation dam

This data set consists of digital polygon coverage that defines the shoreline of Littlefield Lake in Audubon Co., Iowa. The U.S. Geological Survey conducted a...本数据集由用于界定艾奥瓦州奥杜邦县利特菲尔德湖岸线范围的数字多边形覆盖数据构成。美国地质调查局（U.S. Geological Survey）开展了……