In 1791, a map of France by J. L. Dupain-Triel used contour lines at 20-metre intervals, hachures, spot-heights and a vertical section.
Daɣ awatay wan 1791, karti tan France ijja J. L. Dupain-Triel ijja iyaka tan jir ila 20 n metir, hachure tan,hachure,spot-height tan d edag ibdadan