From d1921d2d0bf08b3f5a4d3e87fd20fad9c4c9e673 Mon Sep 17 00:00:00 2001
From: XANTRONIX Industrial <xan@xantronix.com>
Date: Wed, 26 Feb 2025 18:25:22 -0500
Subject: [PATCH] Convert wind speed in m/s to knots
---
lib/xmet/hodograph.py | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/lib/xmet/hodograph.py b/lib/xmet/hodograph.py
index 68baa90..c90e0c2 100644
--- a/lib/xmet/hodograph.py
+++ b/lib/xmet/hodograph.py
@@ -18,6 +18,9 @@ def radians(degrees: float) -> float:
def degrees(radians: float) -> float:
return (radians * (180.0 / math.pi)) - 90
+def knots(ms: float) -> float:
+ return ms * 1.944
+
class Hodograph():
def __init__(self, width, height):
self.width = min(width, height)
@@ -151,7 +154,8 @@ class Hodograph():
if sx_last is not None and sy_last is not None:
cr.move_to(x + sx_last, x + sy_last)
- sx, sy = self.sample_to_screen(sample.wind_speed, sample.wind_dir)
+ sx, sy = self.sample_to_screen(knots(sample.wind_speed),
+ sample.wind_dir)
if first:
cr.move_to(x + sx, y + sy)