privatize scaling.latlon_to_xy

Author: kandersolar

pvlib/scaling.py

@@ -146,7 +146,7 @@ def fn(x):
     return vr
 
 
-def latlon_to_xy(coordinates):
+def _latlon_to_xy(coordinates):
     """
     Convert latitude and longitude in degrees to a coordinate system measured
     in meters from zero deg latitude, zero deg longitude.