Description Usage Format Source
The U.S. National Vegetation Classification (NVC) is provided as a series of tables at http://usnvc.org/explore-classification/. The NVC is fundamentally hierarchical; representation of the data as a directed acyclic graph (DAG) is useful because of the tools available for graphs are useful for traversing the hierarchy.
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An igraph graph with 8193 nodes and 8192 edges, and 46 attributes identical to those of unit_data
ELEMENT_GLOBAL_ID
The unique identifier of the NVC category
PARENT_ID
The identifier of the parent of the NVC category
D_CLASSIFICATION_LEVEL_ID
A factor corresponding to the level of the hierarchy
elementUID
ELEMENT_GLOBAL_ID prefixed with '2.', presumably to identify it as deriving from version 2 of the standard
classificationCode
An alpha-numeric sequence indicating the placement of the category in the NVC hierarchy
databaseCode
An identifier for creating an SQL database
Status
Whether the category has been accepted into the NVC
colloquialName
A 'common' name for the category, if available
scientificName
A name for the category, which may include scientific names of characteristic taxa
formattedScientificName
'scientificName' with HTML formatting
translatedName
'scientificName' with common name substitution
hierarchyLevel
Name of the level of the hierarchy
unitSort
An alpha-numeric code indicating the placement of the category in the NVC; different from 'classificationCode'
USstatus
A code ???
parentKey
The 'databaseCode' of the parent of a category
parentName
Another representation of the parent of a category
typeConceptSentence
A concise sentence describing the category
typeConcept
Text description of the conceptual model of the category
classificationComments
Comments about the classification
similarNVCtypesComments
Comments referencing similar categories
diagnosticCharacteristics
Text description (with HTML tags) of the characteristics that differentiate the category
Rationale
Unknown; all NA
Physiognomy
Text description (with HTML tags) of the physiognomic characteristics (structure) of the category
Floristics
Text description (with HTML tags) of the floral characteristics (species/groups) of the category
Dynamics
Text description (with HTML tags) of the physical/ecological dynamics of the category
Environment
Text description (with HTML tags) of the environmental characteristics (e.g., climate) of the category
Analysis
Unknown; all NA
Range
Text description of the category's geographical spread and/or relationship to other classifications
spatialPattern
Categorical designation of how the NVC category is typically arranged, e.g., large patch vs. linear
Nations
Comma-separated string of two-letter country codes indicating nations where the category is found
Subnations
Comma-separated string of two-letter state and province codes indicating where the category is found
federalLands
Semicolon-separated string of agency and site where the category is found
tncEcoregions
Comma-separated string relating the category to one or more TNC ecoregion
usfsEcoregions
Comma-separated string relating the category to one or more USDA Forest Service ecoregion
omernikEcoregions
Unknown; all NA
classif_confidence_id
A code describing Low:High confidence of the category classification; see d_classif_confidence
confidenceComments
Text describing how/why the confidence level was assigned; mostly empty
Synonymy
Text (with HTML tags) describing synonyms or approx. synonyms of the category to other classifications
primaryConceptSource
Reference of the authority of the concept
descriptionAuthor
The person/entity who authored the 'description' (perhaps the typeConcept?)
Acknowledgements
Text giving acknowledgement
versionDate
Text date stamp, format = mm/dd/yyy
CLASSIFICATION_LEVEL_NAME
Name of the level of the hierarchy; see also hierarchyLevel
DISPLAY_ORDER
Numeric indicator of the category's placement in the hierarchy
parent_level_id
Numeric indicator of the category's parent category
https://www1.usgs.gov/csas/nvcs_data/USNVCFullDownload.zip
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