Add the abilty to parse NumLinesOverlap from cub file

ale/base/type_sensor.py

@@ -128,6 +128,16 @@ class PushFrame():
     def num_frames(self):
         return int(self.image_lines // self.framelet_height)
 
+    @property
+    def num_lines_overlap(self):
+        """
+        Returns
+        -------
+        : int
+          For PushFrame sensors, returns how many many lines of a framelet
+          overlap with neighboring framelets.
+        """
+        return 0
 
     @property
     def ephemeris_stop_time(self):

ale/drivers/lro_drivers.py

@@ -1188,6 +1188,19 @@ class LroLrocWacIsisLabelNaifSpiceDriver(PushFrame, IsisLabel, NaifSpice, Radial
         elif self.instrument_id == "LRO_LROCWAC_VIS":
             return 14
 
+    @property
+    def num_lines_overlap(self):
+        """
+        Returns
+        -------
+        : int
+          How many many lines of a framelet overlap with neighboring framelets.
+        """
+        try:
+            return self.label['IsisCube']['Instrument']['NumLinesOverlap']
+        except:
+            # May be missing, and then the default is 0
+            return 0
 
     @property
     def filter_number(self):

ale/formatters/formatter.py

@@ -65,6 +65,7 @@ def to_isd(driver):
         meta_data['framelet_order_reversed'] = driver.framelet_order_reversed
         meta_data['framelets_flipped'] = driver.framelets_flipped
         meta_data['framelet_height'] = driver.framelet_height
+        meta_data['num_lines_overlap'] = driver.num_lines_overlap
 
     # SAR sensor model specifics
     if isinstance(driver, Radar):