fix missing crs in metadata for points_from_xy (#316)

dask_geopandas/core.py

@@ -878,7 +878,7 @@ def func(data, x, y, z):
         )
 
     return df.map_partitions(
-        func, x, y, z, meta=geopandas.GeoSeries(), token="points_from_xy"
+        func, x, y, z, meta=geopandas.GeoSeries(crs=crs), token="points_from_xy"
     )
 
 

dask_geopandas/expr.py

@@ -910,7 +910,7 @@ def func(data, x, y, z):
         )
 
     return df.map_partitions(
-        func, x, y, z, meta=geopandas.GeoSeries(), token="points_from_xy"
+        func, x, y, z, meta=geopandas.GeoSeries(crs=crs), token="points_from_xy"
     )
 
 

dask_geopandas/tests/test_core.py

@@ -181,6 +181,7 @@ def test_points_from_xy_with_crs():
     )
     assert isinstance(actual, dask_geopandas.GeoSeries)
     assert_geoseries_equal(actual.compute(), expected)
+    assert actual.crs == expected.crs
 
 
 def test_from_wkt():