From d00ec213e005f8609e52a8754cb7e135ee157514 Mon Sep 17 00:00:00 2001
From: facat <facat@facat.com>
Date: Mon, 20 Sep 2021 22:41:40 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E5=9C=B0=E9=97=AA=E5=AF=86?=
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---
 core.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core.py b/core.py
index 4970129..09fba3b 100644
--- a/core.py
+++ b/core.py
@@ -274,3 +274,7 @@ def tangent_line_k(line_x, line_y, center_x, center_y, radius, init_k=10.0):
             k_angle.append(math.pi + math.atan(kk))
     # 返回相对x轴最大的角度k
     return np.array(k_candidate)[np.max(k_angle) == k_angle].tolist()[-1]
+
+
+def func_ng(td):  # 地闪密度
+    return 0.023 * (td ** 1.3)