Level IV Ecoregions of Delaware

Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and...按州划分的生态区（Ecoregions）从无缝衔接的全国形状文件（shapefile）中提取。生态区指的是生态系统及生态类型、质量等方面具有总体相似性的区域……