Ecosys_EcoMapDivisions_2025

The Ecomap 2025 contains a feature class for five different levels of the National Hierarchical Framework of Ecological Units (the Hierarchy. FSM 2060): Ecological Domains, Ecological Divisions, Ecological Provinces, Ecological Sections, and Ecological Subsections. The Ecomap 2025 data set describes the ecological hierarchy within the conterminous United States. Each feature class contains polygons attributed with the code and name of the ecological unit along with the codes and names of broader scale units into which a given ecological unit is nested. It contains regional geographic delineations for analysis of ecological relationships across ecological units. ECOMAP is the term used for a USDA Forest Service initiative to map ecological units and encourage their use in ecosystem-based approaches to forest and range land conservation and management. This is a collaborative effort with many partners. It is coordinated at the national and regional levels by USDA Forest Service staff and implemented in cooperation with State forestry agencies and others. ECOMAP mapping criteria are outlined in the National Hierarchical Framework of Ecological Units (Cleland et al. 1997, FSM 2060). The framework systematically divides the country into progressively smaller areas that have similar geophysical and biological characteristics and ecological processes.Ecomap 2025数据集包含对应美国国家生态单元分级框架（National Hierarchical Framework of Ecological Units，即FSM 2060所述分级体系）五个层级的要素类：生态域（Ecological Domains）、生态区（Ecological Divisions）、生态省（Ecological Provinces）、生态段（Ecological Sections）与生态亚区（Ecological Subsections）。 Ecomap 2025数据集描绘了美国本土范围内的生态分级体系。每个要素类均包含带有属性的多边形，其属性涵盖该生态单元的编码与名称，以及包含该生态单元的更大尺度层级单元的编码与名称。 该数据集包含区域地理区划，可用于开展跨生态单元的生态关系分析。 ECOMAP是美国农业部林务局（USDA Forest Service）发起的一项行动的名称，该行动旨在绘制生态单元地图，并推动其在基于生态系统的森林与牧场保护及管理工作中的应用。 本项目为多方协作成果，由美国农业部林务局工作人员在国家与区域层面统筹协调，并与各州林业机构及其他合作伙伴共同推进实施。 ECOMAP的制图规范已在《国家生态单元分级框架》（Cleland等，1997；FSM 2060）中予以明确。 该分级体系将美国国土系统划分为逐级缩小的区域，各区域均具备相似的地球物理、生物特征及生态过程。