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Three Point Angular Resection

Content for students. A Three Point Angular Resection only gives as a result 2D coordinates of an unknown point an instrument is setup on, from only Horizontal Directions observed in Face Left / Face Right to three points with known coordinates. It includes A bit of Thales (chords and angles within a circle) Sine Rule Fundamental Problems in Land Surveying: Direct and Indirect (mostly known as join and polar calculation in English) Additional Timecodes 00:00 Intro 02:40 Graphical determination of Collin's point 03:09 First Triangle: unknown station inside or outside? 03:30 Additional Geometry derived from Collin's Point 04:48 Thales theorem of chords within a circle 06:31 Working on the Second Triangle: Determination of coordinates of Collin's Point 31:48 Working on the Third Triangle: Determination of coordinates of the unknown station 55:57 Summary