AST Digital Magazine July 2017 Digital-July | Page 25

Volume 14
July 2017 Edition
always results in the same approximate pixels-
per-foot resolution. yourself off the near-by buildings. Consider the
point of the balloon the marked spot.
What changes in the HEED Index is the visual
acuity term assigned to a particular PPF desig-
nation. This tightening-of-the-rules states that we
will expect more from security cameras as tech-
nology improves. Create a similar one for your client showcasing
their site before arriving and use it as a reference
tool for walking-off the distances.
The NHTSA 5-Star Safety Ratings Program (car-
crash ratings) constantly evolves too, provid-
ing tougher and tougher standards as vehicles
improve over time. We feel the same concept
should be applied to surveillance-systems visual-
acuity terms.
Don’t have a laser range-finder?
If you do not have a laser range find