ImageHeader_1.py

"""
generate image header
"""
import numpy as np

from astropy.io import fits
import astropy.wcs as pywcs

from scipy import math
import random

import os
import sys

def chara2digit(char):
    """ Function to judge and convert characters to digitals

    Parameters
    ----------

    """

    try:
        float(char) # for int, long and float
    except ValueError:
        pass
        return char
    else:
        data = float(char)
        return data


def read_header_parameter(filename='global_header.param'):
    """ Function to read the header parameters

    Parameters
    ----------

    """

    name = []
    value = []
    description = []
    for line in open(filename):
        line = line.strip("\n")
        arr = line.split('|')
#        csvReader = csv.reader(csvDataFile)
#        for arr in csvReader:
        name.append(arr[0])
        value.append(chara2digit(arr[1]))
        description.append(arr[2])

#    print(value)
    return name, value, description

def rotate_CD_matrix(cd, pa_aper):
    """Rotate CD matrix
    
    Parameters
    ----------
    cd: (2,2) array
        CD matrix
    
    pa_aper: float
        Position angle, in degrees E from N, of y axis of the detector
    
    Returns
    -------
    cd_rot: (2,2) array
        Rotated CD matrix