update app.oy

app.py

@@ -65,9 +65,6 @@ st.header("Earth Engine Index Calculator")
 # Choose Index or Custom Formula (case-insensitive)
 index_choice = st.selectbox("Select an Index or Enter Custom Formula", ['NDVI', 'NDWI', 'Average NO₂', 'Custom Formula'])
 
-# Select the statistical operation (mean, max, min, sum, median)
-operation_choice = st.selectbox("Select Statistical Operation", ['mean', 'max', 'min', 'sum', 'median'])
-
 # Initialize custom_formula variable
 custom_formula = ""
 
@@ -82,29 +79,6 @@ elif index_choice.lower() == 'custom formula':
     custom_formula = st.text_input("Enter Custom Formula (e.g., 'B5 - B4 / B5 + B4')")
     st.write(f"Custom Formula: {custom_formula}")  # Display the custom formula after the user inputs it
 
-# Function to perform a specified statistical operation
-def calculate_statistic(image, geometry, operation='mean', scale=30):
-    if operation == 'mean':
-        reducer = ee.Reducer.mean()
-    elif operation == 'max':
-        reducer = ee.Reducer.max()
-    elif operation == 'min':
-        reducer = ee.Reducer.min()
-    elif operation == 'sum':
-        reducer = ee.Reducer.sum()
-    elif operation == 'median':
-        reducer = ee.Reducer.median()
-    else:
-        raise ValueError("Invalid operation. Choose from 'mean', 'max', 'min', 'sum', or 'median'.")
-
-    result = image.reduceRegion(
-        reducer=reducer,
-        geometry=geometry,
-        scale=scale
-    )
-    
-    return result
-
 # Function to check if the polygon geometry is valid and convert it to the correct format
 def convert_to_ee_geometry(geometry):
     # Ensure the polygon geometry is in the right format
@@ -178,28 +152,39 @@ if parameters_changed():
         'end_date_str': end_date_str
     }
 
-# Function to calculate NDVI (Normalized Difference Vegetation Index)
-def calculate_ndvi(image, geometry, operation='mean'):
+# Function to perform index calculations
+def calculate_ndvi(image, geometry):
     ndvi = image.normalizedDifference(['B8', 'B4']).rename('NDVI')
-    result = calculate_statistic(ndvi, geometry, operation)
+    result = ndvi.reduceRegion(
+        reducer=ee.Reducer.mean(),
+        geometry=geometry,
+        scale=30
+    )
     return result.get('NDVI')
 
-# Function to calculate NDWI (Normalized Difference Water Index)
-def calculate_ndwi(image, geometry, operation='mean'):
+def calculate_ndwi(image, geometry):
     ndwi = image.normalizedDifference(['B3', 'B8']).rename('NDWI')
-    result = calculate_statistic(ndwi, geometry, operation)
+    result = ndwi.reduceRegion(
+        reducer=ee.Reducer.mean(),
+        geometry=geometry,
+        scale=30
+    )
     return result.get('NDWI')
 
-# Function to calculate average NO2 from Sentinel-5P data
-def calculate_avg_no2_sentinel5p(image, geometry, operation='mean'):
-    no2 = image.select('NO2')
-    result = calculate_statistic(no2, geometry, operation, scale=1000)
-    return result.get('NO2')
+def calculate_avg_no2_sentinel5p(image, geometry):
+    no2 = image.select('NO2').reduceRegion(
+        reducer=ee.Reducer.mean(),
+        geometry=geometry,
+        scale=1000
+    ).get('NO2')
+    return no2
 
-# Function to calculate a custom index using an expression
-def calculate_custom_formula(image, geometry, formula, operation='mean'):
-    custom_index = image.expression(formula).rename('Custom Index')
-    result = calculate_statistic(custom_index, geometry, operation)
+def calculate_custom_formula(image, geometry, formula):
+    result = image.expression(formula).rename('Custom Index').reduceRegion(
+        reducer=ee.Reducer.mean(),
+        geometry=geometry,
+        scale=30
+    )
     return result.get('Custom Index')
 
 # Check if the file uploaded is different from the previous file uploaded