KBRA OPWP Soil Depth to Water

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.本数据集为数字土壤调查成果，总体上属于全国协作土壤调查（National Cooperative Soil Survey）编制的最精细级别的土壤地理数据。该数据集的信息通过以下方式生成：对地图进行数字化处理、将信息汇编至平面校正底图后再行数字化，或是利用遥感及其他信息对已数字化的地图进行修订。 本数据集包含地理参考数字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存储，包含经野外验证的详细土壤与杂类区域清单——这类要素通常在地表呈现可重复的分布模式，且可按当前制图比例尺进行制图表达。 可选包含特殊土壤要素图层（点、线要素）：该图层用于标注那些在当前制图比例尺下尺寸过小无法直接勾绘，但因尺寸与对比度足以显著影响土壤利用与管理的要素的位置。土壤制图单元与国家土壤信息系统（National Soil Information System）关系型数据库（relational database）中的属性相关联，该数据库可提供组成土壤的占比范围及其各项属性。