Update app.py

app.py

@@ -68,18 +68,18 @@ def load_farm_data():
         return None
 
 @st.cache_data
-def get_safe_index_value(image, index_type, band_selection, farm_geometry):
+def get_safe_index_value(_image, index_type, band_selection, farm_geometry, image_date):
     """محاسبه ایمن شاخص‌های گیاهی"""
-    if image is None:
+    if _image is None:
         return None
     try:
         if index_type == "MSAVI":
-            index_image = image.expression(
+            index_image = _image.expression(
                 "(2 * NIR + 1 - sqrt((2 * NIR + 1) ** 2 - 8 * (NIR - RED))) / 2",
-                {"NIR": image.select("B8"), "RED": image.select("B4")}
+                {"NIR": _image.select("B8"), "RED": _image.select("B4")}
             ).rename("MSAVI")
         else:
-            index_image = image.normalizedDifference(band_selection[index_type]).rename(index_type)
+            index_image = _image.normalizedDifference(band_selection[index_type]).rename(index_type)
         
         mean_value = index_image.reduceRegion(
             reducer=ee.Reducer.mean(),
@@ -89,7 +89,7 @@ def get_safe_index_value(image, index_type, band_selection, farm_geometry):
         
         return mean_value if mean_value is not None else 0
     except Exception as e:
-        st.error(f"خطا در محاسبه شاخص {index_type}: {str(e)}")
+        st.error(f"خطا در محاسبه شاخص {index_type} برای تاریخ {image_date}: {str(e)}")
         return 0
 
 def calculate_lai(ndvi):
@@ -284,7 +284,7 @@ def main():
                         if s2_collection.size().getInfo() > 0:
                             s2 = s2_collection.first()
                             for index in band_selection.keys():
-                                value = get_safe_index_value(s2, index, band_selection, farm_geometry)
+                                value = get_safe_index_value(s2, index, band_selection, farm_geometry, date_str)
                                 index_values[index].append(value)
                         else:
                             for index in band_selection.keys():