switch to 15 mintues data, if less than 1 hour of 5 min data

satip/app.py

@@ -241,8 +241,11 @@ def run(
                     start_date=start_date.strftime("%Y-%m-%d-%H:%M:%S"),
                     end_date=pd.Timestamp(start_time, tz="UTC").strftime("%Y-%m-%d-%H:%M:%S"),
                 )
+
                 # Check if any RSS imagery is available, if not, fall back to 15 minutely data
-                if (len(datasets) == 0) or use_hr_serviri:
+                # We check if there are less than 12 datasets, which is 1 hour of 5 minute data.
+                # If there is less than this, we move over to the 15 minute data
+                if (len(datasets) < 12) or use_hr_serviri:
                     log.warn(
                         f"No RSS Imagery available or using backup ({use_hr_serviri=}), "
                         f"falling back to 15-minutely data",