NOT KNOWN FACTS ABOUT CONTOUR SURVEY IN BANGLADESH

Map Pantographic: Supplying specific mapping expert services using pantographic tactics to keep up scale and accuracy.An isohyet or isohyetal line (from Ancient Greek ὑετός (huetos) 'rain') can be a line on a map becoming a member of points of equivalent rainfall in a very provided time period. A map with isohyets is named an isohyetal map.L