From bac0bc3a98d02b77ab35d37836ac0f1b96ac81dc Mon Sep 17 00:00:00 2001 From: Graham McIntire Date: Sat, 11 Apr 2026 13:52:25 -0500 Subject: [PATCH] Update about page: ten factors, mention PWAT and native duct detection --- lib/microwaveprop_web/live/about_live.ex | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/lib/microwaveprop_web/live/about_live.ex b/lib/microwaveprop_web/live/about_live.ex index 779a9369..8bf1c546 100644 --- a/lib/microwaveprop_web/live/about_live.ex +++ b/lib/microwaveprop_web/live/about_live.ex @@ -81,12 +81,13 @@ defmodule MicrowavepropWeb.AboutLive do

- The scoring is a weighted sum of nine factors: humidity, time of - day, T–Td depression, refractivity gradient, sky cover, season, rain, - wind, pressure. The weights are band-dependent because the physics - changes as you go up: humidity helps at 10 GHz (more refractivity) - and hurts at 24+ GHz (absorption). Every coefficient is a hypothesis - I'm checking against the contact and beacon data. + The scoring is a weighted sum of ten factors: rain, humidity, + precipitable water (PWAT), season, refractivity gradient, pressure, + T–Td depression, sky cover, wind, and time of day. Weights were + calibrated via gradient descent against 5,000 QSOs. The physics + changes by frequency: humidity helps at 10 GHz (more refractivity) + and hurts at 24+ GHz (absorption). Refractivity now uses native + HRRR hybrid-sigma levels (10–50 m resolution) for duct detection.