NRCS SSURGO Soils in Kentucky

Data represents a copy of Standard SSURGO from USDA-NRCS. The 85 separate KY SSURGO Survey areas have been appended by USDA-NRCS-KY into file geodatabase format (and corrected for topology rules/gaps/overlaps). The File GDBs also contain an extensive list of ‘pre-built’ attributes compiled from official SSURGO tabular data by USDA-NRCS KY. The GIS data is also provided in shapefile format by Soil Survey Area (85 separate) and by County (120 separate). This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. A special soil features layer (point and line features) is optional. This layer displays the location of features too small to delineate at the mapping scale, but they are large enough and contrasting enough to significantly influence use and management. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.

本数据集为美国农业部自然资源保护服务局（USDA-NRCS）标准土壤调查地理数据库（SSURGO）的副本。美国农业部自然资源保护服务局肯塔基分部（USDA-NRCS-KY）已将85个独立的肯塔基州SSURGO调查区域整合为文件地理数据库格式，并针对拓扑规则、数据缝隙与重叠问题完成修正。该文件地理数据库还包含由USDA-NRCS-KY从官方SSURGO表格数据中整理得到的海量“预构建”属性列表。该地理信息系统（GIS）数据还以形状文件（Shapefile）格式提供，分为85个独立的土壤调查区域图层与120个独立的县级图层。本数据集属于数字化土壤调查成果，通常为全国合作土壤调查（National Cooperative Soil Survey）所产出的最精细级别的土壤地理数据。该数据集通过三种方式生成：数字化地图、将信息整合至平面校正底图后进行数字化，或是利用遥感数据及其他信息修订现有数字化地图。本数据集包含地理参考数字化地图数据与计算机化属性数据。地图数据采用土壤调查区域范围格式，包含经野外验证的详细土壤与杂类区域清单——这些要素通常在地表以可重复的模式出现，且可按成图比例尺进行制图表达。可选包含特殊土壤要素图层（点要素与线要素），该图层用于展示那些在成图比例尺下难以直接勾绘，但面积足够大、特征差异足够显著，足以对土壤利用与管理产生显著影响的要素位置。土壤制图单元与全国土壤信息系统（National Soil Information System）关系型数据库中的属性相关联，该数据库可提供各组成土壤的占比范围及其各项属性信息。