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2eefe64c9b
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Update seasonal scores from sounding data, document commercial link patterns
Soundings (10,935): October has strongest gradients (-350 N/km) and
65.7% ducting, raised seasonal score 82→88. February ducting (20.2%)
exceeds January (14.8%), raised 32→40.
Commercial links (12,068 samples): 68 GHz shows 3.9 dB diurnal swing,
11 GHz shows 1.7 dB with inverted multipath pattern, 24 GHz remarkably
stable at 0.9 dB. Diurnal sensitivity is non-monotonic with frequency.
RAOB gradients avg -265 N/km vs HRRR -107 (2.5x stronger) — confirms
HRRR misses thin surface ducts that soundings resolve.
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2026-04-07 11:45:44 -05:00 |
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3cdd132f24
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Data-driven algorithm refinements from full dataset analysis
Analyzed 37,925 HRRR-matched contacts from 58,367 total.
- Remove shallow BL bonus (score 82 for HPBL < 300m): data shows
medium BL (1000-2000m) produces longest contacts (222 km avg),
not shallow (210 km). Refractivity fallback now uses default score.
- Refine pressure scoring bins: add <980 mb tier (score 88), steeper
gradient from low to high. Contacts at <970 mb avg 242.7 km vs
184.1 km at 990-1000 mb.
- Update algo.md calibration stats (58,367 contacts, 41M HRRR
profiles, 58,361 terrain profiles) and document dataset bias
(99.5% Aug-Sep).
- Create updates.md with full binned analysis tables for all factors.
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2026-04-07 11:15:49 -05:00 |
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