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Unmanned Spaceflight.com _ Titan _ DISR data on PDS

Posted by: remcook Jul 14 2007, 08:45 AM

according to the latest Cassini status report the Huygens DISR data is now on PDS: : http://pds-atmospheres.nmsu.edu/

Have fun!

Posted by: djellison Jul 14 2007, 05:30 PM

I believe Handel wrote a piece of music specifically for this event

Doug

Posted by: peter59 Jul 14 2007, 08:48 PM

I'm confuded. Original data are available in format of Table only.
IMG files do not show original data, they are double in size and
with ugly artifacts (for example, image 1204, see left top and left
bottom corners).

Posted by: elakdawalla Jul 14 2007, 09:06 PM

As with all PDS data, you can check the DOCUMENT folder to find answers to questions about images. I don't have time to download and read, but it looks like this might be a source of answers:
http://atmos.nmsu.edu/PDS/data/hpdisr_0001/DOCUMENT/DISR_CALIBRATION_DOCUMENTS/IMAGERS/IMAGE_CALIBRATION_DOCUMENT.PDF (16 MB)

--Emily

Posted by: ugordan Jul 14 2007, 09:41 PM

QUOTE (peter59 @ Jul 14 2007, 09:48 PM)

with ugly artifacts (for example, image 1204, see left top and left
bottom corners).

Are you sure the IMG software you're using is handling the IMGs correctly? What you've shown is a classic case of digital number (DN) clipping back to zero. This can happen if the software incorrectly assumes incorrect valid ranges representing brightness - note that only the brightest areas are clipped.

Posted by: elakdawalla Jul 14 2007, 10:44 PM

Actually I got the same thing using NASAView.

--Emily

Posted by: edstrick Jul 15 2007, 07:35 AM

The clipped data may be saturated in the original data and have been "masked" to zero, flagging it as invalid.