WCS INFO : Current sky system : Equatorial reference system : ICRS Output sky system : Equatorial Output reference system : ICRS etc. EXTENDED AXES INFO : axisnr - Axis number : 1 axlen - Length of axis in pixels ( NAXIS ): 100 ctype - Type of axis ( CTYPE ): RA - NCP axnamelong - Long axis name : RA - NCP axname - Short axis name : RA etc. AXES INFO : Axis 1 : RA - NCP from pixel 1 to 100 etc. HEADER : SIMPLE = T / SIMPLE FITS FORMAT BITPIX = - 32 / NUMBER OF BITS PER PIXEL NAXIS = 3 / NUMBER OF AXES NAXIS1 = 100 / LENGTH OF AXIS etc. Next we show a simple script which prints meta information of the FITS fileĮxample: mu_fitsutils.py - Print meta data from FITS header or Python dictionary Verbose information for display on terminals and in gui’s. The spectral system, as strings, so the method is suitable to get It provides information about things like the sky system and Header and its associated Projection object. Method _axisinfo() gets its information from a Information is extracted from attributes of a wcs.Projection object Some information is extracted from the FITS header directly. Module maputils provides routines that can display this relevant information.įirst you need to create an object from class maputils.FITSimage. Of the characteristics of this data before you can extract the right slice. To be able to create plots of unfamiliar data without any user interaction, Images as function of velocity or polarization).įor data with only two axes, it can swap those axes (e.g.
Note that PyFITS is not part of the Kapteyn Package.Įxtract data slices from data described by more than two axes (e.g. The methods we use for these purposes are based on package PyFITS (or theĮquivalent in Astropy, astropy.io.fits) butĪre adapted to function in the environment of the Kapteyn Package. Modify it and write it to another FITS file on disk. With module maputils one can extract image data from a FITS file, show () FITS files ¶ A simple utility to analyze a FITS file ¶
(so in principle you are not bound to FITS files).įrom kapteyn import maputils from matplotlib import pyplot as plt f = maputils. Into a powerful module for the extraction and display of FITS image data or externalĭata described by a FITS header or a Python dictionary with FITS keywords Wcs and celestial from the Kapteyn package, together with Matplotlib, The module combines the functionality in modules One can plot spatial rulers which show offsets of constantĭistance whatever the projection of the map is. The world coordinates in the given projection and sky system. Module maputils provides methods to draw a graticule in a plot showing Many of the examples in this tutorialĪre small applications which can be used with your own data with only small modifications Interactive inspection of this data (color editing) and for the creation of Module maputils is your toolkit for writing small and dedicated applicationsįor the inspection and of FITS headers, the extraction, manipulationĭisplay and re-projection of (FITS) data, Tutorial maputils module ¶ Introduction ¶
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