In sketch triangulation, what is the purpose of using two known reference points?

• A. To locate the evidence by forming an imagery triangle
• B. To estimate the distance to the nearest object
• C. To measure only angles
• D. To identify color values of the scene

Answer: (A)

The idea behind sketch triangulation is to use two fixed reference points to pin down the exact location of the evidence. From each reference point you measure the direction to the evidence, giving you two lines of sight. Where those two lines intersect on the sketch is the evidence’s position, and the triangle formed by the two references and the evidence is the imagery triangle that you use to represent the site accurately. With only one reference point you’d only have a single direction, not a definite spot, so two references are needed to fix the location. This method relies on turning angular information into a precise position on the diagram, which is why two known points are essential.