Soil data sources
Coterminous U.S.
SSURGO description here
It exists in shapefile and gridded form (SSURGO and gSSURGO)
STATSGO - description here
There are a variety of ways to get these data:
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Web Soil Survey is a web-based download system that allows users to select a region of interest and download soil data layers. ROIs have to be pretty small.
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Geospatial Data Gateway allows downloads of gSSURGO, SSURGO, STATSGO2, by state or more specific areas.
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Soil Data Access is sort of an API to the NRCS database. Info on how to query this database can be found here. There are also some projects to allow access from R:
- Algorithms for Quantitative Pedology project page has created multiple R packages for soil data access and analysis
- Tutorial 1
- Tutorial 2
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NASIS may be another option