diff --git a/localization_log_gamma_model.py b/localization_log_gamma_model.py
index 6d464cf..f5ea354 100644
--- a/localization_log_gamma_model.py
+++ b/localization_log_gamma_model.py
@@ -31,11 +31,15 @@ def fittingSingle(filepath, args):
     if data is None:
         print("err: failed to load file {}".format(filepath))
         return
+    location_gt_tmp = None
     location_gt = [float('nan'), float('nan')]
     if len(data) is 2:
         data, location_gt_tmp = data
         if location_gt_tmp is not None:
             location_gt = location_gt_tmp * 0.1
+    if args.only_true_loc and location_gt_tmp is None:
+        print("skipped as no groundtruth")
+        return
 
     # convert data matrix to vectors
     rx_locs, rx_rsses = convert_mat_to_vector(data, block_size=0.1)
@@ -173,6 +177,13 @@ if __name__ == '__main__':
         default=None,
         help='output results to filepath'
     )
+    p.add_argument(
+        '--with-true-loc-only', '--trueloc-only',
+        dest='only_true_loc',
+        action='store_true',
+        default=False,
+        help='only parse known location ones'
+    )
     try:
         args = p.parse_args()
     except BaseException as e: