DMC Department Administrative Order (DAO) No. 2007-29 Practice Test 2026 - Free DAO 2007-29 Practice Questions and Study Guide

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Obstructions above the horizon in surveying should be considered for data transmission when they are above how many degrees?

10 degrees

15 degrees

Line-of-sight is essential for data transmission in surveying, and anything that rises into the transmission path can block or degrade the signal. The practical threshold used is 15 degrees above the horizon: if an object extends more than 15 degrees upward, it must be considered because it can interfere with the link between instruments. So when planning data transmission, obstructions that appear at or above 15 degrees elevation are taken into account, and adjustments are made to avoid blocking the signal. Values lower than 15 degrees are less likely to affect the path, while higher thresholds would be overly conservative; 15 degrees offers a balanced guideline.

45 degrees

20 degrees