Eliminating 5 Perimeter Blind Spots Across a 5,100 Sq Ft Desert Estate
How mathematical DORI optical calculations beat an $18,000 alarm installer proposal—saving $9,400 while achieving complete perimeter detection.
The Problems & Initial Vulnerabilities
The Harrisons built a custom home bordering an open desert wash in Scottsdale. A commercial security installer quoted them $18,000 for 14 cameras. However, the proposal placed cameras where installation was easiest rather than where optics were effective.
The installer's layout left a 45-foot unmonitored blind spot along the rear wash and spec'd wide-angle 2.8mm lenses for an 85-foot driveway, making license plates illegible.
Our Forensic Assessment & Findings
Using CAD floor plans and satellite sightline analysis, we audited the proposal:
- Severe DORI Degradation: Driveway cameras offered only 35 PPM (detection level) at the gate instead of the required 250 PPM (identification).
- Forehead Distortion: Cameras were spec'd at 12-foot soffit heights, guaranteeing high-angle facial obscuration for any intruder wearing a hat.
- Redundant Overlap: Six cameras were aimed at low-risk internal patio walls while critical perimeter access points were left open.
Our Engineered Solutions & Blueprint
We engineered a complete, mathematically verified Camera Placement Blueprint:
- Targeted Focal Lengths: Specified two narrow 6.0mm lenses covering the driveway bottleneck to guarantee 250 PPM license plate readability.
- Optimized Elevations: Recalculated mounting elevations to 8.0 feet on stucco pillars to ensure clean eye-level facial capture.
- Reciprocal Overlap: Positioned 8 high-performance PoE cameras with 100% overlapping sightlines, eliminating all perimeter dead zones.
The Results & Verified Impact
The Harrisons achieved 100% gapless perimeter coverage using only 8 cameras instead of the 14 proposed by the installer—saving $9,400 in equipment and labor.
Their property security score increased from 34/100 to 96/100.
“The Camera Placement Planning blueprint was like having an architect for our security. We saved nearly $10,000 and ended up with a far better layout than the big-box installer designed.”
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