From 15b691055a1f009c604b3967063799bd8d8548c8 Mon Sep 17 00:00:00 2001
From: Chunxiao Li <lcx366@gmail.com>
Date: Tue, 5 Nov 2024 08:42:07 +0800
Subject: [PATCH] The problem of repeatedly loading IERS data files when other
 packages call this package has been fixed by dynamically setting environment
 variables.

---
 .DS_Store                     | Bin 6148 -> 6148 bytes
 pyatmos/.DS_Store             | Bin 8196 -> 8196 bytes
 pyatmos/__init__.py           |   8 +++++---
 pyatmos/utils/data_prepare.py |  21 +++++++++++++--------
 4 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/.DS_Store b/.DS_Store
index f27572d692a991a587177bafecb2767dfd71b850..4611e702d91f7075ba9803a44f3069f072e2f643 100644
GIT binary patch
delta 69
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ZZeD)Z<o8VSjNP00nZL7aX6N|J4*<Q~6v_Yq

delta 68
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X-#PgMlRRVBW&!5!ESuRl{_z6<uND-Z

diff --git a/pyatmos/.DS_Store b/pyatmos/.DS_Store
index e8941bcbf35d995231a405c8d4ff99c7277126ee..6fc0733d51879f2cbbfada54a94d0580e39bda86 100644
GIT binary patch
delta 222
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delta 121
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diff --git a/pyatmos/__init__.py b/pyatmos/__init__.py
index 45a9379..83f49a7 100644
--- a/pyatmos/__init__.py
+++ b/pyatmos/__init__.py
@@ -6,7 +6,7 @@ estimation of atmospheric properties for various atmospheric models, such
 as exponential, coesa76, nrlmsise00, and jb2008. 
 
 '''    
-
+import os
 from .standardatmos.expo import expo
 from .standardatmos.coesa76 import coesa76
 
@@ -15,7 +15,9 @@ from .jb2008.spaceweather import download_sw_jb2008,read_sw_jb2008
 
 from .msise.nrlmsise00 import nrlmsise00
 from .jb2008.jb2008 import jb2008
+
 from .utils import data_prepare
 
-# Load and update the EOP file and Leap Second file
-data_prepare.iers_load() 
\ No newline at end of file
+# Load IERS data based on environment variable
+enable_iers_load = os.getenv("ENABLE_IERS_LOAD", "true").lower() == "true"
+data_prepare.iers_load(enable_iers_load)
\ No newline at end of file
diff --git a/pyatmos/utils/data_prepare.py b/pyatmos/utils/data_prepare.py
index 371c621..45b42f6 100644
--- a/pyatmos/utils/data_prepare.py
+++ b/pyatmos/utils/data_prepare.py
@@ -2,11 +2,16 @@ from astropy.utils import iers as iers_astropy
 
 from .data_download import download_iers
 
-def iers_load():
-
-    # load the EOP file
-    dir_iers,eop_file,leapsecond_file = download_iers() 
-    iers_astropy.conf.auto_download = False
-    iers_a = iers_astropy.IERS_A.open(eop_file)
-    leapsecond = iers_astropy.LeapSeconds.from_iers_leap_seconds(leapsecond_file)
-    eop_table = iers_astropy.earth_orientation_table.set(iers_a)
\ No newline at end of file
+def iers_load(enable_iers_load=True):
+    """
+    Loads the EOP (Earth Orientation Parameters) and Leap Second files from IERS.
+    This function downloads the necessary files if they are not found locally, and then sets up the Astropy libraries to use this data.
+    """
+    if enable_iers_load:
+        # Download the EOP and Leap Second files
+        dir_iers,eop_file,leapsecond_file = download_iers()
+        # Load IERS data for Astropy
+        iers_astropy.conf.auto_download = False # Prevent automatic IERS download by Astropy
+        iers_a = iers_astropy.IERS_A.open(eop_file) # Load IERS data
+        leapsecond = iers_astropy.LeapSeconds.from_iers_leap_seconds(leapsecond_file) # Load Leap Second data
+        eop_table = iers_astropy.earth_orientation_table.set(iers_a) # Configure Astropy to use IERS data