Make CDELT1 negative, for visualization

guaix-ucm · Jul 15, 2018 · 7cc2209 · 7cc2209
1 parent 8576895
commit 7cc2209
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/megaradrp/processing/wcs.py b/megaradrp/processing/wcs.py
@@ -30,4 +30,7 @@ def update_wcs_from_ipa(hdr, pa):
     hdr['PC2_2'] = cos_pa
     hdr['PC1_2'] = sin_pa
     hdr['PC2_1'] = -sin_pa
+    # CDELT1 must be negative
+    hdr['CDELT1'] = -abs(hdr['CDELT1'])
+
     return hdr