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Load unit conversion map

Source: R/cleaning_reference.R
load_unit_map.Rd

Returns a tibble of unit conversion factors for harmonizing measurement units. Contains conversions from various units to canonical forms (e.g., ug/L -> mg/L).

Usage

load_unit_map(cache_dir = NULL)

Arguments

cache_dir

Directory for cache files (e.g., "inst/extdata")

Value

Tibble with columns: from_unit, to_unit, multiplier, category, confidence, source, offset, conversion_type

Details

Structure:

  • from_unit: Source unit string (case-sensitive)

  • to_unit: Target canonical unit

  • multiplier: Conversion factor (from_unit * multiplier = to_unit)

  • category: Unit category (concentration, mass, dose, etc.)

  • confidence: Match quality ("HIGH" for exact case, "LOW" for case-insensitive or approximate)

  • source: Provenance (ECOTOX, SSWQS, user_added)