Update metadata for rotations. Create helper tool for WCS matrix.

Author: MSKirk

suncet_processing_pipeline/make_level1.py

@@ -199,7 +199,9 @@ def __coarse_rotate(self, data, telemetry):
         # Determining the number of 90 deg rotations to keep solar north approximately on the top of the matrix
         k = np.round(angle_deg / 90)
 
-        # TODO: update self.metadata rotation to indicate the number of rotations
+        self.metadata.coord_sys_rotation = k * 90.
+        self.metadata.wcs_rot_pc11, self.metadata.wcs_rot_pc12, self.metadata.wcs_rot_pc21, self.metadata.wcs_rot_pc22 = \
+            (utilities.CROTA_2_WCSrotation_matrix(k * 90.))
 
         return np.rot90(data, k)
 

suncet_processing_pipeline/suncet_utility.py

@@ -95,3 +95,18 @@ def detector_angle(telemetry, degrees=True):
         suncet_angle = angle_rad
 
     return suncet_angle
+
+def CROTA_2_WCSrotation_matrix(crota2, decimals=6):
+    """
+    converts from the Rotation of the horizontal and vertical axes in the xy-plane to WCS coordinate rotation matrix.
+    :param crota2: degree rotation of the xy coordinate plane
+    :param decimals: Number of decimals to keep for finite precision
+    :return: pc1_1, pc1_2, pc2_1, pc2_2
+    """
+
+    pc1_1 = np.round(np.cos(np.deg2rad(crota2)), decimals=decimals)
+    pc1_2 = np.round(-1 * np.sin(np.deg2rad(crota2)), decimals=decimals)
+    pc2_1 = np.round(np.sin(np.deg2rad(crota2)), decimals=decimals)
+    pc2_2 = np.round(np.cos(np.deg2rad(crota2)), decimals=decimals)
+
+    return pc1_1, pc1_2, pc2_1, pc2_2