1998_Glacier margins derived from 1998 aerial imagery for the named glaciers of Glacier National Park, MT and environs

These polygon features represent digitization of the glacier margins for the 37 named glaciers of Glacier National Park (GNP) and the 2 glaciers along the border of...这些多边形要素（polygon features）系冰川国家公园（Glacier National Park，GNP）内37处已命名冰川，以及沿……边界的2处冰川的冰川边缘数字化成果。