For topographical mapping , cartographers use the laws of plane trigonometry which tells us that the length of just one side and 2 angles of a triangle is all we need to know in order to determine the length of the remaining 2 sides and final angle . This triangulation method is one of the basic formulas that surveyors and cartographers use when creating maps and can be determined using dead reckoning for length and a theodolite which is used to measure the two angles at the ends of the given length . This tool is still used today , but is typically a combination instrument called a phototheodolite which combines the modern mapping technique of photogrammetry with that of the ancient theodolite for more precise terrestrial measurements .
TUANA . ANKARA ÜMMÜGÜLSÜM AYYILDIZ SİNCAN ŞEHİTABDULLAH BÜYÜKSOY BİLSEM