भारत में, मानक स्थलाकृतिक मानचित्र (topographic maps) आमतौर पर कितने समोच्च अंतराल (contour intervals) के साथ उपलब्ध होते हैं?

In survey work using a total station with reflector measurements, which of the following sequence of temporary adjustments must be performed at a station?

While carrying out a total station survey on one bank of a 250 m wide river, it is necessary to plot electric transmission posts on the opposite bank. No provision exists for crossing the river and the posts are inaccessible. In which mode should the survey work be done?