1. Purpose of Sketch Portrays physical facts
Specifies an exact location of evidence at scene
Provides a mental picture

2. Rough or Final Sketch… Why?!

3. Measuring
What units should you measure the crime scene in? __________________________
In science we use the ______________ ______________.
Why do scientists use this system?

4. Step 1: Rectangular Coordinates
Use 2 adjacent (next to each other) walls
Measure at right angles (90)

5. Step 2: Measure length & Width of crime scene

6. Step 3: Final Sketch - Scaling
Helps avoid distortion
Each block represents a specified length.
Count the number of blocks along the length and width.
Round your length to a whole number that is divisible by the number of boxes.
Divide by the number of boxes.