The polygons mapped here by default are the Ecoregion Sections of California that overlap with some but not all of the tiles used for CalVeg data. All the data of the original source data (http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5362995.zip) are also provided in this upload.
This polygon layer consists of boundaries for the ecological tile units and CALVEG zone units currently being used to tile the EVEG (existing vegetation) dataset. Selected lines were added from the CalWater watershed layer where finer tile divisions were needed.
Additionally, attributes from Ecological Units of California (Ecological Domain, Division, Province, Section and Subsection) have been incorporated into this layer. (see Procedures and Citation sections).
It appears that the subnsections are from:
Goudey, C.B., and D.W. Smith, eds. 1994.
Title
Ecological Units of California: Subsections