fix sip reading problem with wcs key.

astropy · Jul 17, 2017 · e46106a · e46106a
1 parent f398cee
commit e46106a
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/astropy/wcs/wcs.py b/astropy/wcs/wcs.py
@@ -1106,12 +1106,12 @@ def _read_sip_kw(self, header, wcskey=""):
         if a is None and b is None and ap is None and bp is None:
             return None
 
-        if str("CRPIX1") not in header or str("CRPIX2") not in header:
+        if str("CRPIX1"+wcskey) not in header or str("CRPIX2"+wcskey) not in header:
             raise ValueError(
                 "Header has SIP keywords without CRPIX keywords")
 
-        crpix1 = header.get("CRPIX1")
-        crpix2 = header.get("CRPIX2")
+        crpix1 = header.get("CRPIX1"+wcskey)
+        crpix2 = header.get("CRPIX2"+wcskey)
 
         return Sip(a, b, ap, bp, (crpix1, crpix2))