The document that provides accurate spatial relationships of evidence that complement details of the scene provided by photographs is called a ________.

The correct answer is scene diagram. A scene diagram is a crucial tool in crime scene investigation as it provides a detailed and accurate representation of spatial relationships between various pieces of evidence and important features of the crime scene. This diagram complements the visual information captured in photographs by offering a scale and placement context that photographs alone may not convey effectively.

While photographs capture a moment in time, a scene diagram is drawn to scale, illustrating the precise location of evidence, objects, and any relevant structural features. It serves as an important reference for investigators in understanding how evidence relates to one another spatially, which can be pivotal for analysis, reconstruction, and courtroom presentations.

Other options like triangulation refer to a method for measuring distances and creating a diagram rather than the diagram itself. An incident report outlines the circumstances of the incident but doesn't convey spatial relationships. Comparison photographs may show differences between two scenes or items but do not focus on the layout or spatial arrangement within a specific scene.