SSURGO Percent Soil Clay for California, USA

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 inventoryof soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown atthe scale mapped. A special soil features layer (point and linefeatures) is optional. This layer displays the location of featurestoo small to delineate at the mapping scale, but they are largeenough and contrasting enough to significantly influence use andmanagement. The soil map units are linked to attributes in theNational Soil Information System relational database, which givesthe proportionate extent of the component soils and their properties.