What type of sketch is designed to show the horizontal plane of a crime scene?

The floor plan sketch is specifically designed to show the horizontal plane of a crime scene. It provides a top-down view that allows investigators to visualize the layout of the scene, including the locations of evidence, the arrangement of rooms, and the overall geometry of the area. This type of sketch captures important spatial relationships and distances between objects, which is crucial for crime scene analysis.

In contrast, a cross-section sketch would provide a vertical slice of the scene, highlighting different levels but not the entire horizontal layout. An isometric sketch offers a three-dimensional perspective that can capture depth and volume but does not focus specifically on the horizontal plane. Lastly, a 3D perspective sketch aims to present a more realistic view by incorporating depth, which can obscure the precise spatial arrangements critical to a crime scene. Thus, the floor plan sketch stands out as the most appropriate choice for conveying the horizontal plane in a crime scene investigation.