Getting Started

Documentation

Glish

Learn More

Programming

Contact Us

Version 1.9 Build 803

News	FAQ
Search	Home

From foreign formats (e.g. FITS)

Presently, there is capability to

• Convert FITS image files to AIPS++ format

  im := imagefromfits('x.app', 'X.FITS') # Convert from FITS
  im.view()                              # Display
  #
  im2 := imagefromfits(infile='X.FITS')  # Output Image tool is virtual
  im2.view()
  

  In the second example, we didn't write the AIPS++ image out - it's stored in memory. This is called a virtual image (see below).

• Access FITS image files directly

  im := image('X.FITS')                  # Native FITS access
  im.view()                              # Display
  

  This example shows how the image constructor can also be used to gain native access to the FITS file. No format conversions occur and the data are sourced directly from the FITS file. Performance will be good unless you start to try to access the data in non-native order. For example, if with the Viewer, you reordered the display axes from their native order, performance would be poorer. Always convert to an AIPS++ image if you need to do this.

• Access Miriad image files directly

  im := image('hcn.mir')                 # Native Miriad access
  im.view()                              # Display
  

  The same comments above about native FITS file performance apply here as well.

• Convert Miriad or GIPSY image files to AIPS++ format via FITS and an installation of that package

  im := imagefromforeign('hcn.app', 'hcn', package='gipsy')
  im.view()                              # Display
  

  This constructor relies on the nominated package being installed. It is used to write out a temporary FITS file which is then converted to AIPS++ format.