Ecosys_EcoMapProvinces_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 数据集包含针对全国生态单元分级框架（National Hierarchical Framework of Ecological Units，FSM 2060，即层级体系）五个不同层级的要素类：生态域（Ecological Domains）、生态分区（Ecological Divisions）、生态省（Ecological Provinces）、生态段（Ecological Sections）与生态亚区（Ecological Subsections）。Ecomap 2025 数据集描述了美国本土范围内的生态层级结构。各要素类均由带有属性信息的面要素构成，记录了对应生态单元的编码与名称，以及该生态单元所嵌套的更大尺度生态单元的编码与名称。该数据集附带区域地理区划数据，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）发起的生态单元制图倡议的统称，其目标是推动基于生态系统方法开展森林与牧场用地的保护与管理工作。本项目为多方协作成果，由美国农业部林务局人员在国家及区域层面统筹协调，并与各州林业主管部门及其他合作伙伴协同实施。ECOMAP 的制图规范详见《全国生态单元分级框架》（Cleland等，1997，FSM 2060），该框架将美国国土系统性地划分为一系列逐级缩小的区域，各区域均具备相似的地球物理特征、生物特征与生态过程。