Merge pull request #28 from kjordahl/bug/series_unary_op

BUG: _series_unary_op should return a series

geopandas/geoseries.py

@@ -118,7 +118,7 @@ class GeoSeries(Series):
 
     def _series_unary_op(self, op):
         """Unary operation that returns a Series"""
-        return GeoSeries([getattr(geom, op) for geom in self],
+        return Series([getattr(geom, op) for geom in self],
                          index=self.index)
 
     #

tests/test_geoseries.py

@@ -1,6 +1,7 @@
 import unittest
 import numpy as np
 from numpy.testing import assert_array_equal
+from pandas import Series
 from shapely.geometry import Polygon, Point, LineString
 from shapely.geometry.base import BaseGeometry
 from geopandas import GeoSeries
@@ -38,6 +39,7 @@ class TestSeries(unittest.TestCase):
                                    crs={'init': 'epsg:4326', 'no_defs': True})
 
     def test_area(self):
+        assert type(self.g1.area) is Series
         assert_array_equal(self.g1.area.values, np.array([0.5, 1.0]))
 
     def test_in(self):