If the contour lines are not numerically labeled and adjacent lines have the same style (with the same weight, color and type), then the direction of the gradient cannot be determined from the contour lines alone.
Yéning garis kontur punika nénten kadaginin label numerik saha garis sané masandingan punika madué wentuk sané pateh ( bobot, warna, miwah rupa sané pateh), punika mawinan arah gradian nénten prasida kapastikayang wantah saking garis kontur kémanten.