Getting Parent Material Data out of SSURGO

May 27, 2010
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[This article was first published on dylan's blog, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)
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Parent material data is stored within the copm and copmgrp tables. The copm table can be linked to the copmgrp table via the ‘copmgrpkey’ field, and the copmgrp table can be linked to the component table via the ‘cokey’ field. The following queries illustrate these table relationships, and show one possible strategy for extracting the parent material information associated with the largest component of each map unit.

 
Several of the example queries are based on this map unit:

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