GPItv Viewer User’s Guide

This chapter describes how to use the gpitv graphical data viewer to view your GPI data.

GPItv is a ds9-like FITS data viewer tool customized for GPI, including display of spectral and polarimetric datacubes and interactive tools for high contrast image analysis such as measuring contrast and performing spectral differencing of cubes. GPItv provides GPI observers with both a simple means for cursory “quick look” data analysis in real time at the telescope, plus a set of tools for viewing and manipulating GPI data during post-observing scientific analyses.

GPItv is a heavily customized derivative from ATV, the well-known DS9-like display tool for astronomical images in IDL (Barth et al. 2001; http://www.physics.uci.edu/~barth/atv/), with much new functionality developed specifically for GPI. Anyone familiar with using ATV, SAOimage or DS9 will get used to GPItv very quickly.

Warning

Screen shots not yet ported into this HTML documentation.

Acknowledgements

GPItv is based on atv by Aaron Barth et al. The Header Viewer dialog in gpitv is taken from the OSIRIS Quicklook tool ql2, itself derived from the NIRC2/NIRspec quicklook. The “Browse Files” dialog is based upon code derived from David Fanning’s tool selectimage.pro.

Contents

• Summary of Functionality
• Starting GPItv
• Quick Overview
• Example Usage Cases
  • Open an image and change display settings:
  • Search a specific keyword in the header of a FITS image:
  • Pick your preferred units:
  • Measure contrast curve:
  • Detect a companion using Simple Difference Imaging:
  • Plot the spectrum and brightness of the companion
  • Working with Polarimetric Images
• Additional Features
  • Starting Multiple gpitv sessions
  • Optional Input Keywords
  • The coordinate system
  • Image statistics
  • Blinking images
  • Displaying GPI Wavelength Calibration grids
  • Other functions
  • Datacube Default Scaling Mode Droplist
  • Mouse modes in display window
  • Keyboard shortcut commands in display window
  • Displaying the state of GPI during some FITS file
• GPItv Options