diff --git a/src/xsar/sentinel1_dataset.py b/src/xsar/sentinel1_dataset.py
index b57ad9b..84262e2 100644
--- a/src/xsar/sentinel1_dataset.py
+++ b/src/xsar/sentinel1_dataset.py
@@ -292,9 +292,10 @@ def __init__(self, dataset_id, resolution=None,
 
         # load land_mask by default for GRD products
 
-        self.add_high_resolution_variables(
-            patch_variable=patch_variable, luts=luts, lazy_loading=lazyloading)
+
         if 'GRD' in str(self.datatree.attrs['product']):
+            self.add_high_resolution_variables(
+                                   patch_variable=patch_variable, luts=luts, lazy_loading=lazyloading)
             if self.apply_recalibration:
                 self.select_gains()
             self.apply_calibration_and_denoising()