Discover Munsell-related columns in a FEBR layer table

Returns a list with elements moist_string (single column with the Munsell string), moist_hue, moist_value, moist_chroma (separate columns), dry_string, dry_hue, dry_value, dry_chroma. Each is either a column name (character) or NA_character_. The loader uses the parsed columns when available, falls back to parsing the string column.

Usage

.detect_febr_munsell_columns(cols)

Details

Recognised conventions (from the May 2026 scan of 249 FEBR datasets):

• cor_munsell_umida (ctb0039, ctb0572)

• cor_cod_munsell_umida (ctb0032)

• cor_cod_munsell_umida_1 + cor_nome_munsell_umida_1 (ctb0005)

• cor_cod_munsell_umida_i (ctb0019)

• cor_munsell_umida_matiz + cor_munsell_umida_valor + cor_munsell_umida_croma (ctb0562-ctb0700+)

• cor_munsell_umida_nome (ctb0562+)

• cor_matriz_umido_munsell (canonical, morphology())

Same patterns apply for "seca" (dry).