Fix bug with volume calculations on different dates

las_outputs.py

@@ -160,10 +160,10 @@ def calculate_volumes(profile_name, survey_date, csv_output_dir, ch_limits, volu
         # Create new dataframe if csv does not exist
         volumes = pd.DataFrame()
 
-    for current_date in profiles.columns:
+    # Get Nielsen erosion volumes for current survey date
-        # Get Nielsen erosion volumes
+    current_survey = 'Elevation_' + survey_date
-        chainage = profiles.loc[:, current_date].dropna().index
+    chainage = profiles.loc[:, current_survey].dropna().index
-        elevation = profiles.loc[:, current_date].dropna().values
+    elevation = profiles.loc[:, current_survey].dropna().values
     try:
         volume = nielsen_volumes.volume_available(chainage, elevation, ch_min)
     except ValueError: