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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 LICENSE file at the top-level directory of this distribution 

# for details of code ownership. 

# 

# Use of this source code is governed by a 3-clause BSD-style 

# license that can be found in the LICENSE file. 

 

"""Metadata translation code for HSC FITS headers""" 

 

__all__ = ("HscTranslator", ) 

 

import re 

import logging 

 

import astropy.units as u 

from astropy.coordinates import Angle 

 

from ..translator import cache_translation 

from .suprimecam import SuprimeCamTranslator 

 

log = logging.getLogger(__name__) 

 

 

class HscTranslator(SuprimeCamTranslator): 

"""Metadata translator for HSC standard headers. 

""" 

 

name = "HSC" 

"""Name of this translation class""" 

 

supported_instrument = "HSC" 

"""Supports the HSC instrument.""" 

 

_const_map = {"instrument": "HSC", 

"boresight_rotation_coord": "sky"} 

"""Hard wire HSC even though modern headers call it Hyper Suprime-Cam""" 

 

_trivial_map = {"detector_serial": "T_CCDSN", 

"detector_name": "T_CCDSN", # T_CCDID seems to always be undefined 

} 

"""One-to-one mappings""" 

 

# Zero point for HSC dates: 2012-01-01 51544 -> 2000-01-01 

_DAY0 = 55927 

 

# CCD index mapping for commissioning run 2 

_CCD_MAP_COMMISSIONING_2 = {112: 106, 

107: 105, 

113: 107, 

115: 109, 

108: 110, 

114: 108, 

} 

 

@classmethod 

def can_translate(cls, header, filename=None): 

"""Indicate whether this translation class can translate the 

supplied header. 

 

There is no ``INSTRUME`` header in early HSC files, so this method 

looks for HSC mentions in other headers. In more recent files the 

instrument is called "Hyper Suprime-Cam". 

 

Parameters 

---------- 

header : `dict`-like 

Header to convert to standardized form. 

filename : `str`, optional 

Name of file being translated. 

 

Returns 

------- 

can : `bool` 

`True` if the header is recognized by this class. `False` 

otherwise. 

""" 

if "INSTRUME" in header: 

return header["INSTRUME"] == "Hyper Suprime-Cam" 

 

for k in ("EXP-ID", "FRAMEID"): 

if cls.is_keyword_defined(header, k): 

if header[k].startswith("HSC"): 

return True 

return False 

 

@cache_translation 

def to_exposure_id(self): 

"""Calculate unique exposure integer for this observation 

 

Returns 

------- 

visit : `int` 

Integer uniquely identifying this exposure. 

""" 

exp_id = self._header["EXP-ID"].strip() 

m = re.search(r"^HSCE(\d{8})$", exp_id) # 2016-06-14 and new scheme 

if m: 

self._used_these_cards("EXP-ID") 

return int(m.group(1)) 

 

# Fallback to old scheme 

m = re.search(r"^HSC([A-Z])(\d{6})00$", exp_id) 

if not m: 

raise RuntimeError(f"Unable to interpret EXP-ID: {exp_id}") 

letter, visit = m.groups() 

visit = int(visit) 

if visit == 0: 

# Don't believe it 

frame_id = self._header["FRAMEID"].strip() 

m = re.search(r"^HSC([A-Z])(\d{6})\d{2}$", frame_id) 

if not m: 

raise RuntimeError(f"Unable to interpret FRAMEID: {frame_id}") 

letter, visit = m.groups() 

visit = int(visit) 

if visit % 2: # Odd? 

visit -= 1 

self._used_these_cards("EXP-ID", "FRAMEID") 

return visit + 1000000*(ord(letter) - ord("A")) 

 

@cache_translation 

def to_boresight_rotation_angle(self): 

# Docstring will be inherited. Property defined in properties.py 

# Rotation angle formula determined empirically from visual inspection 

# of HSC images. See DM-9111. 

angle = Angle(270.*u.deg) - Angle(self.quantity_from_card("INST-PA", u.deg)) 

angle = angle.wrap_at("360d") 

return angle 

 

@cache_translation 

def to_detector_num(self): 

"""Calculate the detector number. 

 

Focus CCDs were numbered incorrectly in the readout software during 

commissioning run 2. This method maps to the correct ones. 

 

Returns 

------- 

num : `int` 

Detector number. 

""" 

 

ccd = super().to_detector_num() 

try: 

tjd = self._get_adjusted_mjd() 

except Exception: 

return ccd 

 

if tjd > 390 and tjd < 405: 

ccd = self._CCD_MAP_COMMISSIONING_2.get(ccd, ccd) 

 

return ccd 

 

@cache_translation 

def to_detector_exposure_id(self): 

# Docstring will be inherited. Property defined in properties.py 

return self.to_exposure_id() * 200 + self.to_detector_num()