ground truth

Noun

 * 1) Information acquired  by direct observation rather than by inference.

Translations

 * Chinese:
 * Mandarin: 地面實況
 * Esperanto:
 * Finnish: havainnot
 * French:
 * German: Vor-Ort-Messwert, Feldvergleich
 * Japanese:
 * Russian:

Verb

 * 1) To gather information by direct observation rather than inference.