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OSIRIS Images Q&A
Q1. What is the orientation of the OSIRIS images in the image browser?
The original OSIRIS images as found in the Planetary Science Archive correspond to the field of view existing for the instrument on-board the spacecraft. However, to allow users to easily compare the OSIRIS images to the NAVCAM images as presented in the image browser, as well as those released publicly by OSIRIS, we have performed the following post-processing steps : NAC Images: vertical flip (mirror image in the vertical direction), WAC Images: rotation 180 degrees. As the initial release of comet phase OSIRIS images in the image browser did not have this post-processing step performed an update was made to all images on the 4th February 2016 to take it into account.
Q2. Where can I find the metadata of the OSIRIS images in the image browser?
The metadata is contained within the .IMG file which accompanies each image on the image browser. The FITS files provided on the image browser were generated as an output of a simple processing routine run by the Rosetta Downlink & Archive group. They are not representative of the OSIRIS science data but rather provide an additional quick look view. More details can be found within the associated dataset that is placed in the Planetary Science Archive
Q3. Where can I find more information about the format of the archived images and OSIRIS instrument configuration?
Detailed documentation about OSIRIS and its image data can be found in the Document folder contained within each dataset placed in the Planetary Science Archive
Q4. Why are there less OSIRIS (and NAVCAM) images in the image browser than contained in the Archive?
Before release on the image browser, the Rosetta Downlink & Archive group checks all images and removes those which are considered to be overexposed, with data lost, or due to internal calibrations.
All images can of course be found in the Planetary Science Archive