ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

304 CHAPTER 23. X CIA REFERENCE GUIDE
• Process / Selected: Execute the user selected data processing. Warnings are displayed if
some corrections have already been made to the current data set. Note that these warnings
concern only the current x cia session. So before processing data, the user should have a
look at the data history in order to check that some data corrections have not yet been
processed (see above Data / Display History).
• Tools / xv temp: Launch xv temp. See Section 14.4.7.
• Tools / xv raster: Launch xv raster. See Section 14.4.11.
• Tools / isocont (ISOCAM axis): Launch isocont. See Section 14.6.2.
• Tools / isocont (RA/DEC axis): As above, but the MOSAIC is displayed with EAST
left and NORTH up.
• Tools / x isocont: Launch x isocont. See Section 14.6.3.
• Tools / hardcopy (gif): Create a print file of the isocont display (see above) in GIF
format.
• Tools / hardcopy (ps): Create a print file of the isocont display (see above) in postscript
format.
Some additional corrections can be performed. But second order corrections should not be
used unless standard processing has been performed first to assess the quality of data.
• Remove Dark Residuals: Dark pattern residuals can be removed using filtering in
Fourier space. Note that this secondary order method updates ISODATA.IMAGE, whereas
first order dark correction updates ISODATA.CUBE.
• Smooth Undefined Values: It may happen that ISODATA.RASTER contains undefined
values (if there is no stabilized value for example). Undefined values can be replaced
with smoothed values, as determined from neighboring pixels.
• FOV Distortion: The FOV distortion effect can be corrected: the trapezoidal shape
of pixels is then taken into account in order to re-sample the image. Distortion can be
assumed to be linear around the central pixel (linear method) or can be calculated from
ground calibration measurements (calibration method).
• Spectral Deconvolution: The measured spectrum can be deconvolved of the spectral
resolution of the CVF filter. Note that the spectral sensitivity is corrected by selecting the
Jy/pixel units instead of ADU/s/pixel.