2-foot Elevation contours of beach topography and near-shore bathymetry of Lake Superior at the Duluth Entry, Duluth, MN, September 2020
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The elevation contours in this dataset have a 2-foot (ft) interval and were derived from a digital elevation model (DEM) of beach topography and near-shore bathymetry...
本数据集所涵盖的高程等高线间距为2英尺（ft），其数据提取自海滩地形与近岸水深地形的数字高程模型（digital elevation model, DEM）……
