Level III Ecoregions of Maryland

Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and...各州生态区（Ecoregions）数据从无缝衔接的全国shapefile中提取得到。生态区指在生态系统特征、类型、质量及……方面具备总体相似性的区域。