从一个FITS文件复制空间中的标题从一个FITS文件到新创建的FITS文件
问题描述:
我有一个程序处理现有的FITS文件(xbulge-w1.fits
),并将处理后的图像保存到新的FITS(w1_resampled.fits
)。我想将原始标题复制到新的标题中,以便它们处于相同的坐标(即星系)。
我想用下面的代码来做到这一点:从一个FITS文件复制空间中的标题从一个FITS文件到新创建的FITS文件
# Open the FITS files as input image and mask
# Process the images
# Rescale image to galactic coordinates and display
# Plot and save median filtered images as png, rescaled to galactic coordinates
# Save as FITS files and close
# Edit FITS headers to recenter images at galactic center
header = fits.getdata('xbulge-w1.fits', header=True)
header['COMMENT'] = 'Resampled with median filtered pixels'
header['IMAGEW'] = 877
header['IMAGEH'] = 901
header['WCSAXES'] = (2, 'Number of coordinate axes')
header['CRPIX1'] = 438.5
header['CRPIX2'] = 450.5
header['PC1_1'] = (-0.0333333333333, 'Coordinate transformation matrix element')
header['PC2_2'] = (0.0333333333333, 'Coordinate transformation matrix element')
header['CDELT1'] = (1., '[deg] Coordinate increment at reference point')
header['CDELT2'] = (1., '[deg] Coordinate increment at reference point')
header['CUNIT1'] = ('deg ', 'Units of coordinate increment and value')
header['CUNIT2'] = ('deg ', 'Units of coordinate increment and value')
header['CTYPE1'] = 'GLON-AIT'
header['CTYPE2'] = 'GLAT-AIT'
header['CRVAL1'] = (0., '[deg] Coordinate value at reference point')
header['CRVAL2'] = (0., '[deg] Coordinate value at reference point')
header['LONPOLE'] = (0., '[deg] Native longitude of celestial pole')
header['LATPOLE'] = (90., '[deg] Native latitude of celestial pole')
header['RADESYS'] = ('ICRS ', 'Equatorial coordinate system')
fits.writeto('w1_resampled.fits', header, overwrite=True)
fits.writeto('w2_resampled.fits', header, overwrite=True)
hdulist.close()
hdulist2.close()
hdulist3.close()
第5条评论列出工作职能的程序,它只是我遇到问题的标题。当我在DS9打开w1_resampled.fits
,头部包含
SIMPLE = T/conforms to FITS standard
BITPIX = -32/array data type
NAXIS = 2/number of array dimensions
NAXIS1 = 877
NAXIS2 = 901
EXTEND = T
END
,而不是从xbulge-w1.fits
头复制的数据。
如何将数据从一个标题复制到另一个标题?
答
哦,我明白了。我太过于复杂了。这就是我需要做的:在[文件]
# Edit FITS headers to recenter images at galactic center
w1_resampled_header = w1header
w2_resampled_header = w2header
w1_resampled_header['CRPIX1'] = w1header['CRPIX1']
w1_resampled_header['CRPIX2'] = w1header['CRPIX2']
w2_resampled_header['CRPIX1'] = w2header['CRPIX1']
w2_resampled_header['CRPIX2'] = w2header['CRPIX2']
# Save as FITS files and close
fits.writeto('w1_resampled.fits',
w1_resampled,
w1_resampled_header,
overwrite = True)
fits.writeto('w2_resampled.fits',
w2_resampled,
w2_resampled_header,
overwrite = True)
看(http://docs.astropy.org/en/stable/io/fits/api/files.html#astropy.io.fits。 writeto):'fits.writeto'的第二个参数是* data *,而不是头。 – Evert
类似地,['fits.getdata'](http://docs.astropy.org/en/stable/io/fits/api/files.html#astropy.io.fits.getdata)返回一个2元组的' (data,header)';你只把它分配给'header',所以我很惊讶你可以用字典形式使用'header',因为它是一个元组。也许这行在你的实际代码中有'fits.getheader'? – Evert