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# This file is part of astro_metadata_translator. 

# 

# Developed for the LSST Data Management System. 

# This product includes software developed by the LSST Project 

# (http://www.lsst.org). 

# See the COPYRIGHT file at the top-level directory of this distribution 

# for details of code ownership. 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the GNU General Public License 

# along with this program. If not, see <http://www.gnu.org/licenses/>. 

 

"""Generically useful translation helpers which translation classes 

can use. 

 

They are written as free functions. Some of them are written 

as if they are methods of `MetadataTranslator`, allowing them to be attached 

to translator classes that need them. These methods have full access to 

the translator methods. 

 

Other functions are pure helpers that can be imported and used to help 

translation classes without using `MetadataTranslator` properties. 

 

""" 

 

__all__ = ("to_location_via_telescope_name", 

"altitude_from_zenith_distance") 

 

from astropy.coordinates import EarthLocation 

import astropy.units as u 

 

 

def to_location_via_telescope_name(self): 

"""Calculate the observatory location via the telescope name. 

 

Returns 

------- 

loc : `astropy.coordinates.EarthLocation` 

Location of the observatory. 

""" 

return EarthLocation.of_site(self.to_telescope()) 

 

 

def altitude_from_zenith_distance(zd): 

"""Convert zenith distance to altitude 

 

Parameters 

---------- 

zd : `astropy.units.Quantity` 

Zenith distance as an angle. 

 

Returns 

------- 

alt : `astropy.units.Quantity` 

Altitude. 

""" 

return 90.*u.deg - zd