Python 无法从SDS共同添加的条纹图像读取WCS_Python_Astropy_Fits

Python 无法从SDS共同添加的条纹图像读取WCS

python

Python 无法从SDS共同添加的条纹图像读取WCS,python,astropy,fits,Python,Astropy,Fits,我尝试使用satrapy和以下代码从FITS文件读取世界坐标系（WCS）： from astropy.wcs import WCS from astropy.io import fits data = 'file.fits' hdu = fits.open(data) w = WCS(hdu[0].header) 我得到一个错误： WARNING: FITSFixedWarning: RADECSYS= 'ICRS ' RADECSYS is non-standard, use RA

我尝试使用satrapy和以下代码从FITS文件读取世界坐标系（WCS）：

from astropy.wcs import WCS
from astropy.io import fits
data = 'file.fits'    
hdu = fits.open(data)
w = WCS(hdu[0].header)

我得到一个错误：

WARNING: FITSFixedWarning: RADECSYS= 'ICRS ' 
RADECSYS is non-standard, use RADESYSa. [astropy.wcs.wcs]

头文件是：

SIMPLE  =                    T                                                  
BITPIX  =                  -32                                                  
NAXIS   =                    2                                                  
NAXIS1  =                 2048                                                  
NAXIS2  =                 1489                                                  
RADECSYS= 'ICRS    '                                                            
CTYPE1  = 'DEC--TAN'                                                            
CTYPE2  = 'RA---TAN'                                                            
CUNIT1  = 'deg     '                                                            
CUNIT2  = 'deg     '                                                            
CRPIX1  = 1.02500000000000E+03                                                  
CRPIX2  = 7.45000000000000E+02                                                  
CRVAL1  = 7.34210000000000E-01                                                  
CRVAL2  = 2.49604300000000E+01                                                  
CD1_1   = 1.09999999400000E-04                                                  
CD2_2   = 1.09999999400000E-04                                                  
CD1_2   = 0.00000000000000E+00                                                  
CD2_1   = 0.00000000000000E+00                                                  
COADD_0 = 'fpCs-002570-i5-0112.resamp.fits'                                     
COADD_1 = 'fpCs-002570-i5-0113.resamp.fits'                                     
COADD_2 = 'fpCs-002650-i5-0142.resamp.fits'                                     
COADD_3 = 'fpCs-002650-i5-0143.resamp.fits'                                     
COADD_4 = 'fpCs-002677-i5-0142.resamp.fits'                                     
COADD_5 = 'fpCs-002677-i5-0143.resamp.fits'                                     
COADD_6 = 'fpCs-002700-i5-0032.resamp.fits'                                     
COADD_7 = 'fpCs-002700-i5-0033.resamp.fits'                                     
COADD_8 = 'fpCs-002728-i5-0579.resamp.fits'                                     
COADD_9 = 'fpCs-002728-i5-0580.resamp.fits'                                     
COADD_10= 'fpCs-002738-i5-0084.resamp.fits'                                     
COADD_11= 'fpCs-002738-i5-0085.resamp.fits'                                     
COADD_12= 'fpCs-002820-i5-0032.resamp.fits'                                     
COADD_13= 'fpCs-002820-i5-0033.resamp.fits'                                     
COADD_14= 'fpCs-002855-i5-0038.resamp.fits'                                     
COADD_15= 'fpCs-002855-i5-0039.resamp.fits'                                     
COADD_16= 'fpCs-002873-i5-0075.resamp.fits'                                     
COADD_17= 'fpCs-002873-i5-0076.resamp.fits'                                     
COADD_18= 'fpCs-003362-i5-0033.resamp.fits'                                     
COADD_19= 'fpCs-003362-i5-0034.resamp.fits'                                     
COADD_20= 'fpCs-003362-i5-0035.resamp.fits'                                     
COADD_21= 'fpCs-003384-i5-0535.resamp.fits'                                     
COADD_22= 'fpCs-003384-i5-0536.resamp.fits'                                     
COADD_23= 'fpCs-004128-i5-0289.resamp.fits'                                     
COADD_24= 'fpCs-004128-i5-0290.resamp.fits'                                     
COADD_25= 'fpCs-004157-i5-0042.resamp.fits'                                     
COADD_26= 'fpCs-004157-i5-0043.resamp.fits'                                     
COADD_27= 'fpCs-004198-i5-0528.resamp.fits'                                     
COADD_28= 'fpCs-004198-i5-0529.resamp.fits'                                     
COADD_29= 'fpCs-004207-i5-0538.resamp.fits'                                     
COADD_30= 'fpCs-004207-i5-0539.resamp.fits'                                     
COADD_31= 'fpCs-004868-i5-0374.resamp.fits'                                     
COADD_32= 'fpCs-004868-i5-0375.resamp.fits'                                     
COADD_33= 'fpCs-004874-i5-0587.resamp.fits'                                     
COADD_34= 'fpCs-004874-i5-0588.resamp.fits'                                     
COADD_35= 'fpCs-004895-i5-0202.resamp.fits'                                     
COADD_36= 'fpCs-004895-i5-0203.resamp.fits'                                     
COADD_37= 'fpCs-004905-i5-0168.resamp.fits'                                     
COADD_38= 'fpCs-004905-i5-0169.resamp.fits'                                     
COADD_39= 'fpCs-004933-i5-0529.resamp.fits'                                     
COADD_40= 'fpCs-004933-i5-0530.resamp.fits'                                     
COADD_41= 'fpCs-004948-i5-0109.resamp.fits'                                     
COADD_42= 'fpCs-004948-i5-0110.resamp.fits'                                     
COADD_43= 'fpCs-005566-i5-0395.resamp.fits'                                     
COADD_44= 'fpCs-005566-i5-0396.resamp.fits'                                     
COADD_45= 'fpCs-005603-i5-0614.resamp.fits'                                     
COADD_46= 'fpCs-005603-i5-0615.resamp.fits'                                     
COADD_47= 'fpCs-005633-i5-0582.resamp.fits'                                     
COADD_48= 'fpCs-005633-i5-0583.resamp.fits'                                     
COADD_49= 'fpCs-005642-i5-0242.resamp.fits'                                     
COADD_50= 'fpCs-005642-i5-0243.resamp.fits'                                     
COADD_51= 'fpCs-005658-i5-0069.resamp.fits'                                     
COADD_52= 'fpCs-005658-i5-0070.resamp.fits'                                     
COADD_53= 'fpCs-005765-i5-0161.resamp.fits'                                     
COADD_54= 'fpCs-005765-i5-0162.resamp.fits'                                     
COADD_55= 'fpCs-005770-i5-0548.resamp.fits'                                     
COADD_56= 'fpCs-005770-i5-0549.resamp.fits'                                     
COADD_57= 'fpCs-005777-i5-0013.resamp.fits'                                     
COADD_58= 'fpCs-005777-i5-0014.resamp.fits'                                     
COADD_59= 'fpCs-005781-i5-0546.resamp.fits'                                     
COADD_60= 'fpCs-005781-i5-0547.resamp.fits'                                     
COADD_61= 'fpCs-005792-i5-0587.resamp.fits'                                     
COADD_62= 'fpCs-005792-i5-0588.resamp.fits'                                     
COADD_63= 'fpCs-005792-i5-0589.resamp.fits'                                     
COADD_64= 'fpCs-005800-i5-0568.resamp.fits'                                     
COADD_65= 'fpCs-005800-i5-0569.resamp.fits'                                     
COADD_66= 'fpCs-005813-i5-0605.resamp.fits'                                     
COADD_67= 'fpCs-005813-i5-0606.resamp.fits'                                     
COADD_68= 'fpCs-005823-i5-0572.resamp.fits'                                     
COADD_69= 'fpCs-005823-i5-0573.resamp.fits'                                     
COADD_70= 'fpCs-005898-i5-0610.resamp.fits'                                     
COADD_71= 'fpCs-005898-i5-0611.resamp.fits'                                     
COADD_72= 'fpCs-005918-i5-0587.resamp.fits'                                     
COADD_73= 'fpCs-005918-i5-0588.resamp.fits'

我将它与头文件中的其他WCS进行了比较，它看起来确实不同，但我确定如何修复这些问题。此外，我不确定如何使用

RADESYSa

而不是

RADECSYS

。我似乎找不到任何文档。任何帮助都将不胜感激

问题在于，根据FITS标准，关键字标题应为

RADESYS

而不是

RADECSYS

（请向制作此FITS文件的人员报告）。要避免警告，可以执行以下操作：

from astropy.wcs import WCS
from astropy.io import fits
data = 'file.fits'    
hdu = fits.open(data)
hdu[0].header.rename_keyword('RADECSYS', 'RADESYS')
w = WCS(hdu[0].header)

此外，OP称这是一个“错误”，这只是一个警告，说明文件使用的是旧的不正确格式。这可能是值得重写的消息，因为它会混淆用户阅读这样的文件，他们没有创建。。。