Level IV Ecoregions of Texas

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）从无缝拼接的国家级形状文件（shapefile）中提取得到。生态区指在生态系统、类型与质量等方面具有总体相似性的区域。