Soil Storie Index (Productivity), Sonoma County and Surrounds

Jan 12, 2016 (Last modified Sep 14, 2017)
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Dataset was used in a scientifically peer-reviewed publication
Description:
This CA Storie Index dataset is from the USDA SSURGO soils database. The attribute displayed is "castorieindex", and the dataset also includes many other SSURGO attributes.

The entire dataset can be downloaded from the following website: http://websoilsurvey.sc.egov.usda.gov/App/HomePage.htm

The Storie Index is a soil rating based on soil properties that govern a soil's potential for cultivated agriculture in California.

The Storie Index assesses the productivity of a soil from the following four characteristics: Factor A, degree of soil profile development; factor B, texture of the surface layer; factor C, slope; and factor X, manageable features, including drainage, microrelief, fertility, acidity, erosion, and salt content. A score ranging from 0 to 100 percent is determined for each factor, and the scores are then multiplied together to derive an index rating.

For simplification, Storie Index ratings have been combined into six grade classes as follows: Grade 1 (excellent), 100 to 80; grade 2 (good), 79 to 60; grade 3 (fair), 59 to 40; grade 4 (poor), 39 to 20; grade 5 (very poor), 19 to 10; and grade 6 (nonagricultural), less than 10.

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An alternate description comes from the dataset:


"The Storie Index is a widely known and accepted method of rating soils for land use and productivity in California. This soil-based land classification system has been used in California for over 50 years. Storie ratings can be found in published soil surveys throughout California,. The latest version of the Storie Index was published in 1978. Traditionally, Storie Index ratings have been hand generated by soil survey staff and collaborators,. These ratings can be highly subjective, because no single person has generated Storie ratings for the entire state, and because of the inherent biases associated with the
design of the classification system. O'Geen et al. (2008) have developed a revised version of the Storie Index that generates ratings digitally from the USDA NRCS National Soil Information System (NASIS). This revised Storie Index is generated from a wide range of soil profile and landscape characterisitics similar to those used in Storie (1978)."

So, to summarize, it appears that the castorieindex field in SSURGO is the revised storie index by Ogeen et al. ( http://anrcatalog.ucanr.edu/pdf/8335.pdf )
Data Provided By:
SSURGO and O'Geen et al. (2008)
Content date:
not specified
Citation:
O'Geen, A.T., Southard, S.B., Southard, R.J. 2008. A Revised Storie Index for Use with Digital Soils Information. University of California Division of Agriculture and Natural Resources, Publication 8335.
Contact Organization:
University of California
Contact Person(s):
not specified
Use Constraints:
Creative Commons LicenseThis work is licensed under a Creative Commons Attribution 3.0 License.
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Tags:
sonoma, storie index, ssurgo
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http://anrcatalog.ucanr.edu/pdf/8335.pdf

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