Image Reduction Software
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Questions and Answers

What is the purpose of running the command 'sudo dpkg --add-architecture i386' during IRAF installation?

  • To install Anaconda for Linux
  • To add a 32-bit architecture to the system (correct)
  • To configure the virtual environment
  • To update the Ubuntu system

    • What is the recommended way to run installation commands in Ubuntu?

  • Use the 'Anaconda' user to run the command
  • Use the 'root' user to run the command
  • Run the command as a normal user
  • Run the command as an administrator using 'sudo' (correct)

    • What is the purpose of installing 'libc6:i386' during IRAF installation?

  • To configure the IRAF environment
  • To install the Anaconda virtual environment
  • To provide compatibility with 32-bit libraries (correct)
  • To install the SAOImage DS9

    • What is the recommended way to access the Anaconda file for Linux?

    <p>Through the Ubuntu file explorer</p> Signup and view all the answers

    What is the primary cause of bad pixels in an image?

    <p>Pixels that die or misbehave</p> Signup and view all the answers

    What is the purpose of creating a bias.list file?

    <p>To compile all the bias files into a list</p> Signup and view all the answers

    What is the purpose of running the command 'conda config --set auto_activate_base false'?

    <p>To stop the autostart of the virtual environment from startup</p> Signup and view all the answers

    What is the sequence of commands to open the ccdred application package in IRAF?

    <p>ecl &gt; noao &gt; imred &gt; ccdred</p> Signup and view all the answers

    What is the recommended system architecture for downloading SAOImage DS9?

    <p>Ubuntu 22 ARM64</p> Signup and view all the answers

    What is the purpose of installing 'libz1:i386' during IRAF installation?

    <p>To provide compatibility with 32-bit libraries</p> Signup and view all the answers

    What is the purpose of the 'ls' command in the bias correction process?

    <p>To check the files that will be renamed</p> Signup and view all the answers

    What is the reason for quantifying read noise?

    <p>Because it cannot be corrected</p> Signup and view all the answers

    What is the command to install the IRAF dependencies?

    <p>sudo apt-get install libc6:i386 libz1:i386 libncurses5:i386 libbz2-1.0:i386 libuuid1:i386 libxcb1:i386 libxmu6:i386</p> Signup and view all the answers

    What is the purpose of creating an Anaconda virtual environment?

    <p>To isolate the IRAF installation from the system environment</p> Signup and view all the answers

    What is the purpose of the 'display [filename.fits]' command in the bias correction process?

    <p>To check the current bias image</p> Signup and view all the answers

    What is the result of combining all the bias files in the list?

    <p>A master bias</p> Signup and view all the answers

    What is the primary cause of fringe correction?

    <p>The interference of light due to a thin film on the optics</p> Signup and view all the answers

    What is the purpose of the 'cat bias.list' command in the bias correction process?

    <p>To display the contents of the bias.list file</p> Signup and view all the answers

    What is the purpose of the 'datapar' parameter in the daofind command?

    <p>To enter the parameter values</p> Signup and view all the answers

    What is the purpose of the 'findpar' parameter in the daofind command?

    <p>To enter the findpars task</p> Signup and view all the answers

    What is the average value calculated from the FWHM values?

    <p>FWHMPSF value</p> Signup and view all the answers

    What is the purpose of the 'tvmark' command?

    <p>To mark positions on the image displayed in ds9</p> Signup and view all the answers

    What is the purpose of visiting aavso.org?

    <p>To get the finding chart of AE Cas</p> Signup and view all the answers

    What is the purpose of the MAG file?

    <p>To contain photometric measurements of celestial objects</p> Signup and view all the answers

    What is the purpose of the 'exposure' parameter in the daofind command?

    <p>To set the EXPTIME value</p> Signup and view all the answers

    What is the purpose of the 'thresho' parameter in the findpars task?

    <p>To set the threshold value</p> Signup and view all the answers

    What is the purpose of the 'verbose' parameter in the daofind task?

    <p>To display detailed information about the task</p> Signup and view all the answers

    Which software is specifically designed for astronomical imaging?

    <p>MaximDL</p> Signup and view all the answers

    What type of solutions does MIRAMETRICS provide?

    <p>Off-the-shelf and custom image processing, data analysis, and visualization</p> Signup and view all the answers

    Which command in IRAF is used to display an image in the image window?

    <p>display</p> Signup and view all the answers

    What must Windows users do to run IRAF?

    <p>Install VirtualBox to emulate a Unix-like operating system</p> Signup and view all the answers

    Which command would be used in IRAF to edit the parameters for a specific command?

    <p>epar</p> Signup and view all the answers

    Which of the following commands in IRAF is not intended for image processing?

    <p>help</p> Signup and view all the answers

    Which command in IRAF would you use to perform interactive aperture photometry?

    <p>apphot</p> Signup and view all the answers

    What is primarily needed to use IRAF on Windows systems?

    <p>A Unix-like operating system environment</p> Signup and view all the answers

    What type of user would benefit from MIRAMETRICS software?

    <p>Researchers, educators, and students in science and engineering</p> Signup and view all the answers

    What is the primary purpose of image aligning in post-processing?

    <p>To synchronize images taken at different times</p> Signup and view all the answers

    Which command is used to create a coordinate file for aligning images?

    <p>ccred &gt; rimcur &gt; ref.coo</p> Signup and view all the answers

    What should be the minimum number of unsaturated and isolated stars selected for the coordinate file?

    <p>10-20 stars</p> Signup and view all the answers

    What does the command 'epar imalign' require as an input parameter?

    <p>The filename of the shifted image</p> Signup and view all the answers

    Which parameter must be set to determine the size of the marking in the image alignment process?

    <p>radii</p> Signup and view all the answers

    After executing the command 'epar tvmark', what visual confirmation is provided?

    <p>A display of how much stars have shifted</p> Signup and view all the answers

    What is the significance of the 'output' parameter in the image alignment command?

    <p>It specifies the name of the final aligned image file</p> Signup and view all the answers

    Which command allows you to display the coordinates information of registered stars?

    <p>cat ref.coo</p> Signup and view all the answers

    What should be done before combining images in the post-processing workflow?

    <p>Ensure all images are aligned</p> Signup and view all the answers

    Study Notes

    Image Reduction Software

    • MaximDL is an astronomical software for imaging and processing, available for Windows operating systems.
    • MIRAMETRICS provides image processing, data analysis, and data visualization solutions for researchers, educators, and students in science and engineering.
    • IRIS is a powerful image processing utility with a command-line editor and a graphical interface (GUI).

    IRAF (Image Reduction and Analysis Facility)

    • IRAF is a historic way to reduce and analyze imaging and spectroscopic data.
    • Useful IRAF commands include:
      • Help: gives instructions on using commands
      • package: lists command packages loaded
      • epar: edits parameters for commands
      • Lpar: lists parameters for commands
      • display: displays an image in the image window
      • Implot: plots lines or columns of an image in a graphic window
      • Imstat: gives statistics for an image
      • delete: deletes a non-image file
      • Imcopy: copies an image
      • Imrename: renames an image
      • Imdelete: deletes an image
      • zerocomb: processes and combines zero images
      • darkcomb: processes and combines dark images
      • flatcomb: processes and combines flat images
      • ccdproc: processes images of objects
      • combine: adds together images
      • imshift: shifts images
      • imexamine: handy quick measurement of star positions and magnitudes
      • apphot: interactive aperture photometry of star images
      • hedit: edits image header
      • ccdlist: lists images by type
      • imhead: views image header
      • Ls, dir: list directory

    IRAF Installation on Windows

    • IRAF requires a virtual operating system like VirtualBox to run on Windows.
    • Installation involves downloading and installing VirtualBox, then installing IRAF and its dependencies.

    IRAF Dependencies

    • Dependencies include packages like Anaconda for Linux and SAOImage DS9.

    Creating Anaconda Virtual Environment

    • Create a virtual environment using Anaconda to run IRAF.

    Creating IRAF Environment

    • Create an IRAF environment using the created Anaconda virtual environment.

    Image Processing

    • Correcting images involves fringe correction, bad pixel correction, and bias correction.
    • Fringe correction involves analyzing flat field images to correct interference patterns.
    • Bad pixel correction involves marking dead or misbehaving pixels and using interpolation algorithms to estimate their values.
    • Bias correction involves combining bias files into a master bias image.

    Bias Correction

    • Bias correction involves creating a bias list, displaying and renaming bias files, and combining them into a master bias image.

    Image Aligning

    • Image aligning is crucial in post-processing to correct for object shifts in the night sky.
    • Steps involve displaying reference and shifted images, establishing a coordinate file, and aligning images using epar imalign.

    Producing .coo File

    • A .coo file contains the coordinates of objects and is produced using epar daofind.
    • Parameters include FWHM, sigma, gain, readnoise, exposure, filter, and obstime.

    Producing .mag File

    • A .mag file contains photometric measurements of celestial objects, including magnitudes and associated parameters.
    • Steps involve visiting aavso.org to get a finding chart of AE Cas, finding the variable star and standard stars, and using IRAF commands to produce the .mag file.

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    Astronomical Programming II (IRAF/IRIS) PDF

    Description

    This quiz covers different image reduction software, including MaximDL and MIRAMETRICS, used for astronomical imaging, processing, and data analysis.

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