When blood drips vertically onto a flat surface the blood stain is circular. When blood impacts a flat surface at an angle, then an elliptical stain is formed. The angle of impact can be estimated based on measurements of the blood stain.
Parameters:
(1) width of the blood stain in mm
(2) length of the blood stain in mm
SIN(impact angle in degrees) =
= (width of the stain) / (length of the stain)
impact angle in degrees =
= ARCSIN(width of the stain) / (length of the stain)
If multiple stains were made at the same time, then a distribution for the angle estimates can be used to get a better estimate for the true angle of impact.
Limitations:
• The measurements must be taken very carefully. It is important not to include any artifacts or distortions.
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