अज्ञात ऊंचाई वाले बिंदु पर रखे गए लेवलिंग स्टाफ पर ली गई वह रीडिंग, जिससे यह पता लगाया जा सके कि वह बिंदु दृष्टि रेखा (line of sight) से कितना ऊपर या नीचे है, कहलाती है:

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?