GL_Mackinac 2019 ESI HYDRO Polygons, Lines

The feature classes HYDROL and HYDROP contain vector lines and polygons representing the coastal shoreline and hydrography used in the creation of the Environmental...要素类（feature classes）HYDROL与HYDROP包含矢量线与面要素，用以表征海岸线与水文地理要素，用于环境（原文此处存在省略）相关成果的构建工作。