Dr. Hernandez is giving a lecture on how to measure the location of evidence at the scene. What is the first step in measuring a crime scene?

The first step is to select a fixed point, also called a reference point, from which measurements can be made. Evidence locations can then be measured in relation to that point using methods such as triangulation or polar coordinates. Rough sketches record the scene and measurements, but they do not come before establishing a reference point.

AI-written and checked against the verified answer.