diff --git a/shareloc/geomodels/geomodel_template.py b/shareloc/geomodels/geomodel_template.py
index 599b406..93e4e7c 100644
--- a/shareloc/geomodels/geomodel_template.py
+++ b/shareloc/geomodels/geomodel_template.py
@@ -42,6 +42,8 @@ def __init__(self):
         """
         # geomodel type. Set by the subclass
         self.type: str
+        # geomodel epsg projection code
+        self.epsg: int = None
 
     # Define GeoModelTemplate functions interface
 
diff --git a/shareloc/geomodels/grid.py b/shareloc/geomodels/grid.py
index 2c513c8..3aa704f 100755
--- a/shareloc/geomodels/grid.py
+++ b/shareloc/geomodels/grid.py
@@ -103,7 +103,6 @@ def __init__(self, geomodel_path: str):
         self.alts_down = None
         self.rowmax = None
         self.colmax = None
-        self.epsg = 0
 
         # inverse loc predictor attributes
         self.pred_col_min = None
diff --git a/shareloc/geomodels/rpc.py b/shareloc/geomodels/rpc.py
index d9c8373..b5085c1 100755
--- a/shareloc/geomodels/rpc.py
+++ b/shareloc/geomodels/rpc.py
@@ -40,8 +40,6 @@
 # Set numba type of threading layer before parallel target compilation
 config.THREADING_LAYER = "omp"
 
-# pylint: disable=no-member
-
 
 @GeoModel.register("RPC")
 class RPC(GeoModelTemplate):
@@ -53,7 +51,18 @@ class RPC(GeoModelTemplate):
     # pylint: disable=too-many-instance-attributes
     def __init__(self, rpc_params):
         super().__init__()
-        self.epsg = None
+
+        self.offset_alt = None
+        self.scale_alt = None
+        self.offset_col = None
+        self.scale_col = None
+        self.offset_row = None
+        self.scale_row = None
+        self.offset_x = None
+        self.scale_x = None
+        self.offset_y = None
+        self.scale_y = None
+
         self.datum = None
         for key, value in rpc_params.items():
             setattr(self, key, value)