diff --git a/bundle_adjust/ba_timeseries.py b/bundle_adjust/ba_timeseries.py
index da2a74e..b3f2644 100644
--- a/bundle_adjust/ba_timeseries.py
+++ b/bundle_adjust/ba_timeseries.py
@@ -35,7 +35,10 @@ def get_acquisition_date(geotiff_path):
     with rasterio.open(geotiff_path) as src:
         if "TIFFTAG_DATETIME" in src.tags().keys():
             date_string = src.tags()["TIFFTAG_DATETIME"]
-            dt = datetime.datetime.strptime(date_string, "%Y:%m:%d %H:%M:%S")
+            try:
+                dt = datetime.datetime.strptime(date_string, "%Y:%m:%d %H:%M:%S")
+            except:
+                dt = datetime.datetime.strptime(date_string, "%Y:%m:%dT%H:%M:%S")
         else:
             # temporary fix in case the previous tag is missing
             # get datetime from skysat geotiff identifier
@@ -189,7 +192,8 @@ def load_scene(self):
         all_im_rpcs = []
         all_im_datetimes = []
 
-        geotiff_paths = sorted(glob.glob(os.path.join(self.geotiff_dir, "**/*.tif"), recursive=True))
+        geotiff_paths = sorted(glob.glob(os.path.join(self.geotiff_dir, "**/*.[tT][iI][fF]"), recursive=True))
+        assert len(geotiff_paths) > 0, f"No GeoTiffs found in {self.geotiff_dir}."
         if self.geotiff_label is not None:
             geotiff_paths = [os.path.basename(fn) for fn in geotiff_paths if self.geotiff_label in fn]
 
@@ -205,7 +209,9 @@ def load_scene(self):
                     d = json.load(f)
                 rpc = rpcm.RPCModel(d, dict_format="rpcm")
             elif self.rpc_src == "txt":
-                rpc = rpcm.rpc_from_rpc_file(os.path.join(self.rpc_dir, f_id + ".rpc"))
+                rpc_path = os.path.join(self.rpc_dir, f_id + ".rpc")
+                assert os.path.exists(rpc_path), f"{rpc_path} does not exist, make sure to use the <image name>.rpc for RPC files"
+                rpc = rpcm.rpc_from_rpc_file(rpc_path)
             else:
                 raise ValueError("Unknown rpc_src value: {}".format(self.rpc_src))