This internal reference file includes USGS only units/speciations. It was
created in July 2023 using the pcodes domain table from NWIS. All USGS units
and speciations are given a target unit and speciation that is synonymous, but
adheres to the WQX schema (WQX measure unit domain table).
Value
Dataframe of USGS only units and speciations and their WQX compatible
targets/synonyms.
Details
This reference file is used in the TADA_ConvertResultUnits() function where
synonymous units and speciations are harmonized before units are then also
harmonized/converted to WQX targets.