Using These Data in ArcGIS

Join the “Master DI - PI join table by 2016 SSURGO Mapping Unit (MUKEY)” to your SSURGO soils attribute table (SSURGO soils data are the county-level soil survey data that can be downloaded directly from the NRCS). The join should be made on the MUKEY variable. The Master DI - PI by MUKEY table uses the predominant component on each of the ~300,000 mapping units in the contiguous 48 states as the basis for calculating DI and PI. The “Master DI-PI join table by 2016 SSURGO component” provides DI and PI values for the over 1 million components in the SSURGO database components table for the contiguous 48 states.

Downloadable DI and PI Files/Tables Download
Click on corresponding icon to download the file
Master DI_PI join table by 2016 SSURGO Component & Mapping Unit (gdb) Zipped CSV File 14.2 MB
Master DI-PI join table by 2016 SSURGO Mapping Unit (MUKEY) Zipped CSV File 1.78 MB
Master DI_PI join table by 2016 SSURGO Component (csv) Zipped CSV File 4.06 MB
DI modifiers table Adobe Acrobat PDF File 87 KB
PI modifiers table Adobe Acrobat PDF File 122 KB
DI and PI SubGroup Values in 2016 SSURGO Microsoft Excel File 403 KB
DI and PI By Soil Series Microsoft Excel File 3.23 MB

Research Links

Downloadable Research Files Download
Click on corresponding icon to download the file
PI manuscript (2012): "A Taxonomically Based Ordinal Estimate of Soil Productivity for Landscape-Scale Analyses" Adobe Acrobat PDF File 7.1 MB
DI manuscript (2009): "The Natural Soil Drainage Index: An Ordinal Estimate of Long-Term Soil Wetness" Adobe Acrobat PDF File 3.5 MB
2012 Poster: "The Soil Productivity Index: Taxonomically Based, Ordinal Estimates of Soil Productivity" Adobe Acrobat PDF File 3.5 MB
2011 Poster: "Landscape (Soil) Wetness Map of the Conterminous United States"
Presented at the 2011 Esri International Users Conference, San Diego, CA, in 2012
Adobe Acrobat PDF File 4.12 MB
2011 Poster: "The Soil Fertility and Drainage Indexes: Taxonomically Based, Ordinal Estimates of Relative Soil Properties" Adobe Acrobat PDF File 3.5 MB
2008 Poster: "Introducing and Applying a Soil Wetness Index Designed for Modeling, GIS and Mapping Applications"
Presented at the 11th North American Forest Soils Conference, Blacksburg, VA, in 2008
Adobe Acrobat PDF File 1.6 MB
2007 Poster: "Using the New Natural Soil Drainage Index to Highlight and Explain Soil Wetness Patterns in Michigan"
Presented at the annual meeting of the Michigan Academy of Science, Arts and Letters, Big Rapids, MI, in 2007
Adobe Acrobat PDF File 1.4 MB
2007 Poster: "Introducing a New Index of Soil Wetness, and its Potential as a Landscape/Landform Visualization Tool"
Presented at the north-central regional meeting of the Geological Society of America, in Lawrence, KS, in 2007
Adobe Acrobat PDF File 1.6 MB
DI Map (2012) in Esri Map Book Volume 27 (see pages 70-71) Web link Link

For more details about the DI and/or PI workings and theory, to request more detailed copies of posters or have questions answered, feel free to contact Dr. Randall Schaetzl at the Department of Geography, Michigan State University.