LOS Analyzer

Pick an airport, drop in a proposed structure, and LOS Analyzer tells you whether it penetrates the FAA Part 77 imaginary surfaces or breaks the control tower's line of sight — then generates a PDF report and a pre-filled FAA Form 7460-1 aid. A terrain-aware 3D engine models earth curvature and atmospheric refraction, with every assumption in a published methodology and a public validation scoreboard of test cases. It is a screening aid, not an FAA determination or engineering advice. Built on a Google Maps satellite overlay with OCR-assisted coordinate intake.

Before you build near an airport, you need to know whether a structure penetrates the FAA's Part 77 imaginary surfaces or blocks the control tower's line of sight — and eventually file an FAA Form 7460. Today that screening is slow, expensive consultant work, and getting the sightline geometry right is genuinely hard.

Given an airport and a proposed structure, LOS Analyzer computes Part 77 surface penetration and control-tower line of sight using a terrain-aware 3D engine that accounts for earth curvature and atmospheric refraction, so the math reflects how sightlines actually behave over distance. The methodology is published and a validation scoreboard documents named test cases whose outcomes can be checked from the formulas; validation against real FAA determinations is being added in the open. It produces a PDF report plus a pre-filled FAA Form 7460-1 aid, with tesseract.js OCR and Turf.js handling coordinate intake and geometry on a Google Maps satellite overlay. The web app is Next.js 16, the compute server is Express 5 on Lambda, marketing is Astro, and data lives in Drizzle on Aurora Serverless v2, with reports billed through Stripe, all on SST 4.

• FAA Part 77 surface-penetration screening for any proposed structure
• Terrain-aware 3D line-of-sight with earth-curvature + atmospheric refraction
• Auto-generates a PDF report and a pre-filled FAA Form 7460-1 aid
• Published methodology and a public validation scoreboard; a screening aid, not an FAA determination

First screening report free, then $99 per report.

As listed on the LOS Analyzer site on 2026-09-25. The price shown at checkout on the product's own site is the one that applies.

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