Soils

The soils dataset provides a geospatial representation of soil map units compiled from the USDA Natural Resources Conservation Service (NRCS) Soil Survey Geographic Database (SSURGO) or equivalent source. Each mapped polygon is identified by a map unit symbol (MUSYM), which corresponds to a specific soil map unit and serves as a key to detailed tabular attributes. A map unit represents an area containing one or more soil types that occur in a predictable pattern. Within each map unit, soils are further described by components, which typically correspond to soil series—the most detailed level of soil classification in the United States. Soil series describe soils with similar physical, chemical, and morphological properties developed under comparable environmental conditions. Some map units may include urban land or urban complexes, indicating areas where natural soil properties have been significantly altered or obscured by human activities such as construction, grading, or paving. These urban classifications often reflect disturbed or mixed soils with high variability and limited natural horizon development. The dataset supports applications such as land use planning, environmental assessment, engineering analysis, hydrologic modeling, and natural resource management by providing standardized information on soil properties, limitations, and behavior. Contact: Department of Environmental Services Data Accessibility: Publicly Available Update Frequency: As Needed Document Last Revision Date: 6/11/2026 Document Creation Date: 6/11/2026 Feature Dataset Name: Soils Layer Name: Soils_poly Metadata document本土壤数据集提供了土壤图斑的地理空间表征，其数据整合自美国农业部（United States Department of Agriculture, USDA）自然资源保护服务局（Natural Resources Conservation Service, NRCS）的土壤调查地理数据库（Soil Survey Geographic Database, SSURGO）或同类权威数据源。 每个制图多边形均通过图斑符号（map unit symbol, MUSYM）进行标识，该符号对应特定的土壤图斑，同时作为获取详细表格属性的检索依据。 土壤图斑指代一片包含一种或多种按可预测规律分布的土壤类型的区域。 在每个土壤图斑内部，土壤可通过组分进一步细分，这些组分通常对应土系（soil series）——美国土壤分类体系中最精细的分类级别。 土系用于描述在相似环境条件下形成、且具有相似物理、化学与形态学特征的土壤。 部分土壤图斑可能包含城市用地或城市复合地块，代表那些因建筑施工、场地平整或路面铺装等人类活动，导致自然土壤属性被显著改变或遮蔽的区域。 这类城市用地分类通常对应受扰动或混合的土壤，其空间变异性较强且自然土层发育程度有限。 本数据集通过提供标准化的土壤属性、限制因子与性状表现信息，可支撑土地利用规划、环境评估、工程分析、水文模拟（hydrologic modeling）及自然资源管理等各类应用场景。 联系方式：环境服务部 数据可获取性：公开可用 更新频率：按需更新 文档最后修订日期：2026年6月11日 文档创建日期：2026年6月11日 要素数据集名称：Soils 图层名称：Soils_poly 元数据文档