Soil Types (File Geodatabase)

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. For more information, contact: GIS Manager Information Technology & Innovation (ITI) Montgomery County Planning Department, MNCPPC T: 301-650-5620本数据集为数字土壤调查成果，通常是美国国家合作土壤调查局（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三种方式制作：对地图进行数字化处理、将信息整合至平面校正基底后完成数字化，或是利用遥感数据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，包含经详细野外验证的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，且可按照当前成图比例尺进行制图表达。本数据集附带可选的特殊土壤要素图层（包含点、线要素）：该图层用于标注那些在当前成图比例尺下无法单独勾绘，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重要影响的要素位置。土壤制图单元与美国国家土壤信息系统（National Soil Information System）关系型数据库中的属性相关联，该数据库可提供组成土壤的占比范围及其各项属性参数。如需更多信息，请联系：信息技术与创新部（ITI）GIS主管，蒙哥马利县规划局（MNCPPC），电话：301-650-5620