From ac27b3910215b2cce7a5e8d13d5f3cd82d032c3c Mon Sep 17 00:00:00 2001
From: Ivo Sonderegger <chird.ivo@web.de>
Date: Mon, 23 Oct 2023 20:10:25 +0200
Subject: [PATCH] Bugfix in calculating missing sounding wind data

Resolves #79
---
 src/meteoJS/Sounding.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/meteoJS/Sounding.js b/src/meteoJS/Sounding.js
index cef64621..313e7db8 100644
--- a/src/meteoJS/Sounding.js
+++ b/src/meteoJS/Sounding.js
@@ -135,15 +135,15 @@ export class Sounding {
       d.v === undefined &&
       d.wdir !== undefined &&
       d.wspd !== undefined) {
-      d.u = d.wspd * Math.sin(d.wdir / 180 * Math.PI);
-      d.v = d.wspd * Math.cos(d.wdir / 180 * Math.PI);
+      d.u = -d.wspd * Math.sin(d.wdir / 180 * Math.PI);
+      d.v = -d.wspd * Math.cos(d.wdir / 180 * Math.PI);
     }
     else if (d.u !== undefined &&
            d.v !== undefined &&
            d.wdir === undefined &&
            d.wspd === undefined) {
       d.wspd = Math.sqrt(Math.pow(d.u, 2) + Math.pow(d.v, 2));
-      d.wdir = Math.arctan(d.u/d.v) / Math.PI * 180;
+      d.wdir = 270 - (Math.atan2(d.v, d.u) / Math.PI * 180);
     }
   
     // Humidity