fixed bugs for merging ancillary fields into geodataframe

Author: jpswinski

sliderule/icesat2.py

@@ -842,8 +842,7 @@ def atl06p(parm, asset=DEFAULT_ASSET, version=DEFAULT_ICESAT2_SDP_VERSION, callb
             tstart_merge = time.perf_counter()
             for field in field_dictionary:
                 df = geopandas.pd.DataFrame(field_dictionary[field])
-                gdf = gdf.merge(df, on='extent_id', how='inner')
-                gdf.set_axis(gdf.index)
+                gdf = geopandas.pd.merge(gdf, df, on='extent_id', how='inner').set_axis(gdf.index)
             profiles["merge"] = time.perf_counter() - tstart_merge
 
             # Delete Extent ID Column