The photography technique requires the investigator to use both close-up coverage and medium coverage that will provide aerial and vertical view of the suspect positions and items left at the crime scene. The sketches will identify the surrounding area of the crime scene and possible positions of the suspects (Pepper, 2010).
According to Ogle (2011), crime scene sketching aims at creating a permanent record of the distance relationship of the physical evidence and crime scene. Sketching will require the investigator to have folding ruler, graph paper, pencil, and flashlight since it is essential to take proportional measurements such as exit areas and bullet trajectory angles (Pepper, 2010). The sketch is critical in clarifying the information in photographs and videos since it enables the viewer to gauge the dimensions and distances. A sketch is essential in crime scene documentation since it assists during interviewing and interrogations, it relates the sequence of events at the scene, and establishes a precise relationship of objects found at the crime scene (Ogle, 2011).
The sketches may include details such as size if the room, height of a door frame and distance from the door to the window. The projection view of the sketch will show the horizontal floor plan while the schematic perspective is essential in showing the sequence of events such bullet firing position (Horswell, 2010). Another aspect of sketching is the triangulation that will involve taking the distance and measurements from a central position such as bedroom. Crime investigators rely on the rectangular coordinate method of sketching measure the distance from two perpendicular items such as walls and doors. The polar coordinate method is mainly applicable in outdoor crime scenes where there is only one reference point such as road accidents (Ogle, 2011).