Hydrologic landscape regions of the United States
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These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. Hydrologic landscape regions (HLRs) in the United States were delineated by using geographic information system (GIS) tools and statistical methods including principal components and cluster analyses. The GIS and statistical analyses were applied to land-surface form, geologic texture (permeability of the soil and bedrock), and climate variables that describe the physical and climatic setting of 43,931 small (roughly 200 square kilometers) watersheds [...]
本数据集发布于2016年10月1日之前，早于美国地质调查局（USGS）制定的科学数据审核、批准与发布政策的生效日期；该政策的具体要求可参照《USGS调查手册第502.8章：基础科学实践：科学数据发布的审核与批准》。美国境内的水文景观区（Hydrologic Landscape Regions, HLRs）通过地理信息系统（Geographic Information System, GIS）工具及主成分分析、聚类分析等统计方法划定。上述GIS与统计分析的对象涵盖地表形态、地质质地（土壤与基岩渗透率），以及用于描述43931个面积约200平方千米的小型流域物理与气候环境的气候变量……
提供机构：
U.S. Geological Survey
创建时间：
2023-09-28
