Get mapunit ecological sites from Soil Data Access

Usage

get_SDA_coecoclass(
  method = "None",
  areasymbols = NULL,
  mukeys = NULL,
  WHERE = NULL,
  query_string = FALSE,
  ecoclasstypename = c("NRCS Rangeland Site", "NRCS Forestland Site"),
  ecoclassref = "Ecological Site Description Database",
  not_rated_value = "Not assigned",
  miscellaneous_areas = TRUE,
  include_minors = TRUE,
  threshold = 0,
  dsn = NULL
)

Arguments

method: aggregation method. One of: "Dominant Component", "Dominant Condition", "All" or "None" (default). If method="all" multiple numbered columns represent site composition within each map unit e.g. site1..., site2.... If method="none" is selected one row will be returned per component; in all other cases one row will be returned per map unit.
areasymbols: vector of soil survey area symbols
mukeys: vector of map unit keys
WHERE: character containing SQL WHERE clause specified in terms of fields in legend, mapunit, component or coecosite tables, used in lieu of mukeys or areasymbols
query_string: Default: FALSE; if TRUE return a character string containing query that would be sent to SDA via SDA_query
ecoclasstypename: Default: c("NRCS Rangeland Site", "NRCS Forestland Site"). If NULL no constraint on ecoclasstypename is used in the query.
ecoclassref: Default: "Ecological Site Description Database". If NULL no constraint on ecoclassref is used in the query.
not_rated_value: Default: "Not assigned"
miscellaneous_areas: logical. Include miscellaneous areas (non-soil components)?
include_minors: logical. Include minor components? Default: TRUE.
threshold: integer. Default: 0. Minimum combined component percentage (RV) for inclusion of a mapunit's ecological site in wide-format tabular summary. Used only for method="all".
dsn: Path to local SQLite database or a DBIConnection object. If NULL (default) use Soil Data Access API via SDA_query().

Details

When method="Dominant Condition" an additional field ecoclasspct_r is returned in the result with the sum of comppct_r that have the dominant condition ecoclassid. The component with the greatest comppct_r is returned for the component and coecosite level information.

Note that if there are multiple coecoclasskey per ecoclassid there may be more than one record per component.