Elevation contours of beach topography and near-shore bathymetry of Minnesota Point near the Duluth Entry of Lake Superior, Duluth, MN, June 2021
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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...
本数据集的高程等值线采用2英尺（ft）的间隔，其数据源自海滩地形与近岸水深地形的数字高程模型（digital elevation model, DEM）……
