Soil Survey Geographic (SSURGO) database for Ketchikan Area, Alaska

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.