added missing HRSC properties (#425)

* added missing HRSC properties

* moved properties for instrument id to the top

ale/drivers/mex_drivers.py

@@ -481,6 +481,7 @@ class MexHrscPds3NaifSpiceDriver(LineScanner, Pds3Label, NaifSpice, RadialDistor
         """
         return 1
 
+
 class MexHrscIsisLabelNaifSpiceDriver(LineScanner, IsisLabel, NaifSpice, RadialDistortion, Driver):
   
   @property
@@ -511,6 +512,36 @@ class MexHrscIsisLabelNaifSpiceDriver(LineScanner, IsisLabel, NaifSpice, RadialD
       """
       return self.instrument_id
 
+  @property
+  def detector_center_line(self):
+    """
+    Returns the center detector line.
+
+    For HRSC, we are dealing with a single line, so center line will be 0.
+
+    Returns
+    -------
+    : float
+      Detector line of the principal point
+    """
+    return 0.0
+
+
+  @property
+  def detector_center_sample(self):
+    """
+    Returns the center detector sample.
+
+    For HRSC, center sample is consistent regardless of filter. This is
+    different from ISIS's center sample because ISIS line scan sensors use
+    0.5 based detector samples.
+
+    Returns
+    -------
+    : float
+      Detector sample of the principal point
+    """
+    return 2592.0
 
   @property
   def sensor_model_version(self):
@@ -600,6 +631,30 @@ class MexHrscIsisLabelNaifSpiceDriver(LineScanner, IsisLabel, NaifSpice, RadialD
       """
       return spice.bods2c(self.instrument_id)
 
+  @property
+  def focal2pixel_lines(self):
+      """
+      NOTE: These values are pulled from ISIS iak kernels.
+
+      Returns
+      -------
+      : list<double>
+        focal plane to detector lines
+      """
+      return [0.0, 0.0, 111.111111111111]
+
+
+  @property
+  def focal2pixel_samples(self):
+      """
+      NOTE: These values are pulled from ISIS iak kernels.
+
+      Returns
+      -------
+      : list<double>
+        focal plane to detector samples
+      """
+      return [0.0, 111.111111111111, 0.0]
 
 class MexSrcPds3NaifSpiceDriver(Framer, Pds3Label, NaifSpice, RadialDistortion, Driver):
     """