update app.py

app.py

@@ -399,23 +399,52 @@ elif imagery_base == "VIIRS":
         st.error(f"Dataset file '{dataset_file}' not found.")
         data = {}
 elif imagery_base == "Custom Input":
-    custom_dataset_id = st.text_input("Enter Custom Earth Engine Dataset ID (e.g., AHN/AHN4)", value="")
+    custom_dataset_id = st.text_input(
+        "Enter Custom Earth Engine Dataset ID (e.g., MODIS/006/MOD13Q1)", 
+        value="",
+        help="Enter the full path of the EE dataset (e.g., 'COPERNICUS/S2_SR')"
+    )
+
     if custom_dataset_id:
         try:
+            # Clean input if it includes ee.ImageCollection syntax
             if custom_dataset_id.startswith("ee.ImageCollection("):
-                custom_dataset_id = custom_dataset_id.replace("ee.ImageCollection('", "").replace("')", "")
-            collection = ee.ImageCollection(custom_dataset_id)
-            band_names = collection.first().bandNames().getInfo()
+                custom_dataset_id = custom_dataset_id.replace("ee.ImageCollection('", "").replace("')", "").strip()
+
+            # Initialize dataset structure
             data = {
                 f"Custom Dataset: {custom_dataset_id}": {
                     "sub_options": {custom_dataset_id: f"Custom Dataset ({custom_dataset_id})"},
-                    "bands": {custom_dataset_id: band_names}
+                    "bands": {custom_dataset_id: []}
                 }
             }
-            st.write(f"Fetched bands for {custom_dataset_id}: {', '.join(band_names)}")
-            st.write(f"Default Scale for Dataset: {default_scale} meters")
+
+            # Fetch collection and metadata
+            collection = ee.ImageCollection(custom_dataset_id)
+            first_image = collection.first()
+            band_names = first_image.bandNames().getInfo()
+
+            # Get the native scale from GEE (DO NOT DEFAULT TO 30)
+            try:
+                default_scale = first_image.select(0).projection().nominalScale().getInfo()
+                if not isinstance(default_scale, (int, float)) or default_scale <= 0:
+                    raise ValueError("Invalid scale from GEE")
+            except:
+                # If scale detection fails, use GEE's default instead of forcing 30
+                default_scale = None  # Let GEE handle it
+
+            # Update data structure
+            data[f"Custom Dataset: {custom_dataset_id}"]["bands"][custom_dataset_id] = band_names
+
+            st.success(f"✅ Successfully loaded: {custom_dataset_id}")
+            st.write(f"Available Bands: {', '.join(band_names)}")
+            if default_scale:
+                st.write(f"Native Scale: {default_scale} meters")
+            else:
+                st.write("Native Scale: Letting GEE use its default resolution")
+
         except Exception as e:
-            st.error(f"Error fetching dataset: {str(e)}. Please check the dataset ID and ensure it's valid in Google Earth Engine.")
+            st.error(f"Error loading dataset: {str(e)}")
             data = {}
     else:
         st.warning("Please enter a custom dataset ID to proceed.")