Merge pull request #177 from astrofrog/fix-spherical

Support sub-classes of spherical representation classes
astrofrog · Aug 20, 2015 · 1c6f2cc · 1c6f2cc
2 parents db75504 + 18ed5a8
commit 1c6f2cc
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diff --git a/CHANGES.md b/CHANGES.md
@@ -4,6 +4,9 @@
 - Use wcs_to_celestial from Astropy. Astropy >= 1.0 is now required for
   WCSAxes. [#176]
 
+- Fix bug that caused coordinate transformations to not work properly if they
+  used sub-classes of Spherical representation classes. [#177]
+
 0.6 (2015-07-20)
 ----------------
 

diff --git a/wcsaxes/transforms.py b/wcsaxes/transforms.py
@@ -244,8 +244,7 @@ def transform(self, input_coords):
 
         c_out = c_in.transform_to(self.output_system)
 
-        if (c_out.representation is SphericalRepresentation or
-            c_out.representation is UnitSphericalRepresentation):
+        if issubclass(c_out.representation, (SphericalRepresentation, UnitSphericalRepresentation)):
             lon = c_out.data.lon.deg
             lat = c_out.data.lat.deg
         else: