Hide keyboard shortcuts

Hot-keys on this page

r m x p   toggle line displays

j k   next/prev highlighted chunk

0   (zero) top of page

1   (one) first highlighted chunk

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

# 

# LSST Data Management System 

# Copyright 2008, 2009, 2010 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# 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 LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

import sys 

import os 

import collections 

 

from astropy.io import fits 

import numpy as np 

 

import lsst.afw.image as afwImage 

import lsst.daf.base as dafBase 

 

TsField = collections.namedtuple("TsField", "photoCalib gain dateAvg exptime airmass") 

 

 

def converttsField(infile, filt, exptime=53.907456): 

"""Extract data from a tsField table 

 

@param[in] infile path to tsField FITS file 

@param[in] filt index of filter in tsField FILTERS metadata entry 

@param[in] exptime exposure time (sec) 

 

@return a dict with the following entries: 

- photoCalib: an lsst.afw.PhotoCalib 

- gain: gain as a float 

- dateAvg: date of exposure at middle of exposure, as an lsst.daf.base.DateTime 

- exptime: exposure time (sec) 

- airmass: airmass 

""" 

ptr = fits.open(infile) 

50 ↛ 51line 50 didn't jump to line 51, because the condition on line 50 was never true if ptr[0].header['NFIELDS'] != 1: 

print("INVALID TSFIELD FILE") 

sys.exit(1) 

filts = ptr[0].header['FILTERS'].split() 

idx = filts.index(filt) 

 

mjdTaiStart = ptr[1].data.field('mjd')[0][idx] # MJD(TAI) when row 0 was read 

airmass = ptr[1].data.field("airmass")[0][idx] 

 

gain = float(ptr[1].data.field('gain')[0][idx]) # comes out as numpy.float32 

aa = ptr[1].data.field('aa')[0][idx] # f0 = 10**(-0.4*aa) counts/second 

aaErr = ptr[1].data.field('aaErr')[0][idx] 

 

# Conversions 

dateAvg = dafBase.DateTime(mjdTaiStart + 0.5 * exptime / 3600 / 24) 

fluxMag0 = 10**(-0.4 * aa) * exptime 

dfluxMag0 = fluxMag0 * 0.4 * np.log(10.0) * aaErr 

 

photoCalib = afwImage.makePhotoCalibFromCalibZeroPoint(fluxMag0, dfluxMag0) 

 

ptr.close() 

 

return TsField( 

photoCalib=photoCalib, 

gain=gain, 

dateAvg=dateAvg, 

exptime=exptime, 

airmass=airmass, 

) 

 

 

81 ↛ 82line 81 didn't jump to line 82, because the condition on line 81 was never trueif __name__ == '__main__': 

infile = sys.argv[1] 

filt = sys.argv[2] 

if not os.path.isfile(infile): 

sys.exit(1) 

 

converttsField(infile, filt)