Space/Science » in reply to Digital Mirage

re: Digital Mirage - confirmation

nick hoffman — 5/30/2007 6:45:39 AM (archived)

I spent a little while browsing the HiRise site and found other examples of digital overload of the sensor and/or misassigned zero values. Here is an example. I was browsing this image page http://marsoweb.nas.nasa.gov/HiRISE/hirise_images/PSP/orb_002200/PSP_002296_1215/ and I zoomed to the image. I noted several areas on sun-facing terraces where what should have been the brightest area had "zero" (black) assigned to it.

I have circled these areas in red. They are very subtle in this image. other comparable areas nearby (blue) are not overloaded.

I have done a 2X digital zoom to make them more obvious

It appears to be an unreported defect of the imaging system and display software.

There used to be a lot of these artefacts in the early MOC images when the exposure was set too bright. I was suspicious of the original image because everything is so washed out, it looks as if it is already close to overexposed.

Log in or register to post.

The whole thread (78 posts)

• A plain in Mars, nothing special....and then..ooops,a whole!! - Raoul - 5/26/2007 8:04:56 PM
  • The secret entrance to the Martian Underground... - SDAI-Tech1 - 6/2/2007 8:35:36 PM
    • Up to now.... - Raoul - 6/2/2007 11:44:42 PM
  • re: A plain in Mars, nothing special....and then..ooops,a whole!! - TAFKASE - 6/1/2007 9:17:18 PM
  • Digital Mirage - nick hoffman - 5/30/2007 1:24:21 AM
    • OK, I'm wrong - nick hoffman - 6/5/2007 8:37:03 AM
      • Thanks! - TB - 6/5/2007 4:08:53 PM
    • re: Digital Mirage - Buck Galaxy - 5/31/2007 6:03:58 AM
    • re: Digital Mirage - excentryk - 5/30/2007 11:19:51 PM
    • re: Digital Mirage - confirmation - nick hoffman - 5/30/2007 6:45:39 AM
      • The plot thickens... - nick hoffman - 5/31/2007 12:45:48 PM
        • We might be making too much of this - TB - 5/31/2007 4:32:27 PM
          • Apparently there are plans to picture the same area... - Raoul - 6/3/2007 6:20:54 PM
          • re: We might be making too much of this - N R A Hoffman - 5/31/2007 11:45:22 PM
          • I can not find an MOC image for those exact coordinates. - REB - 5/31/2007 6:46:36 PM
          • I am searching through the MOC files for it. I found another one very close to it. - REB - 5/31/2007 5:57:40 PM
            • And notice that dark layering in those collapsed lava tubes. - REB - 5/31/2007 6:06:37 PM
    • re: Lots of relief, etc.., - Raoul - 5/30/2007 5:37:58 AM
      • re: Lots of relief, etc.., - Marcia - 6/1/2007 1:46:52 AM
    • I don't think so... - TB - 5/30/2007 4:27:49 AM
      • re: I don't think so... - nick hoffman - 5/30/2007 5:51:43 AM
        • Try OpenEV. - Robert Clark - 5/30/2007 7:10:43 PM
        • re: I don't think so... - TB - 5/30/2007 5:53:10 PM
        • re: I don't think so... - REB - 5/30/2007 3:36:30 PM
    • Sunlit floor of proposed skylight Dena (8.5 mb) - pb - 5/30/2007 2:56:21 AM
      • "Dena" is a little different. - nick hoffman - 5/30/2007 3:32:31 AM
        • Thanks - pb - 5/30/2007 4:30:31 AM
  • This is probably the most fascinating mars picture I have seen yet... - Arrell - 5/29/2007 6:50:31 PM
  • Does it still look like a HOLE??? (image enhanced) - Raoul - 5/28/2007 8:18:51 AM
    • terraces - nick hoffman - 5/30/2007 5:56:29 AM
    • As you pointed out in another post... - TB - 5/28/2007 4:47:34 PM
      • Maybe it is a liquid. - Lee - 5/28/2007 7:05:35 PM
        • How about once liquid? - REB - 5/29/2007 12:57:31 PM
          • re: How about once liquid? - Marcia - 6/1/2007 2:05:21 AM
            • Very white ice cap covering a hot spring? - REB - 6/1/2007 1:46:08 PM
          • A volcanic crater filled with obsidian would be cool. - Lee - 5/29/2007 6:53:23 PM
  • These holes should be a top priority for Scout or New Horizon type missions - Buck Galaxy - 5/27/2007 9:16:38 PM
  • Short Scientific paper on the Martian holes - folcwine - 5/27/2007 12:54:53 AM
    • Could multicellular life exist in such caves? - Robert Clark - 5/29/2007 2:50:42 PM
    • re: The hole is in APOD, today! - Raoul - 5/28/2007 8:36:23 AM
      • re: The hole is in APOD, today! - It's not just the large one, but there are a few other smaller ones. - Marcia - 5/28/2007 5:04:30 PM
        • Maybe it's one huge cavern with several holes.... - Raoul - 5/28/2007 5:45:14 PM
          • re: Maybe it's one huge cavern with several holes.... yes. - Marcia - 5/28/2007 6:18:38 PM
        • re: The hole is in APOD, today! - It's possible that... - Marcia - 5/28/2007 5:17:20 PM
    • MOC image of sun lit floor of Dena - pb - 5/27/2007 8:32:47 AM
      • Found it (8.5 mb) - pb - 5/30/2007 2:57:51 AM
  • It's the shadow of Phobos. (n/t) - Lee - 5/26/2007 10:25:41 PM
    • It shows a real rim on the closeup photos. Just no bottom. (n/t) - TB - 5/26/2007 10:55:32 PM
      • Yeah, I noticed that after I posted. - Lee - 5/27/2007 2:06:07 AM
  • And that's not the only one - TB - 5/26/2007 9:52:38 PM
  • re: A plain "on" Mars... (n/t) - Raoul - 5/26/2007 8:06:01 PM
    • RE:That's really incredible - Daniel - 5/26/2007 1:17:26 PM - Ted Ferdinand - 5/30/2007 5:11:34 AM
    • That's really incredible - Daniel - 5/26/2007 8:17:26 PM
      • Several mysteries discussed - Raoul - 5/28/2007 7:44:42 AM
      • Fascinating! Potential for a human base there? - Buck Galaxy - 5/26/2007 9:22:16 PM
        • re: Potential for a human base there? - TB - 5/26/2007 9:57:23 PM
        • Can we learn anything by hitting it with radar? - TB - 5/26/2007 9:46:07 PM
          • MOLA? - pb - 5/27/2007 9:19:02 AM
            • Or,... maybe MOLA data already exists? - pb - 5/29/2007 7:20:52 AM
          • re: Sun overhead - Raoul - 5/27/2007 8:19:28 AM
            • So who will be the first to go in there? - richard - 5/27/2007 6:51:39 PM
              • Likely a mountain climber robot with a harpoon (n/t) - Raoul - 5/27/2007 7:08:31 PM
                • Why not a MER? - Lee - 5/27/2007 8:21:39 PM
                  • MERs should be standard equipment. - Lee - 5/27/2007 10:47:30 PM
                    • Where would it get its energy if the Sun doesn't shine in the hole? (n/t) - Raoul - 5/29/2007 7:32:26 AM
                      • The MER wouldn't go into the hole. - Lee - 5/29/2007 11:21:23 AM
                        • MER would make a good platform - Fox - 5/30/2007 4:00:19 AM
                        • Good idea except make it of the Pathfinder class. - Robert Clark - 5/29/2007 2:05:39 PM
                          • It didn't last very long and Sojourner also had solar panels (n/t) - Raoul - 5/29/2007 4:03:45 PM
                  • The trick will be finding a wench who's any good at fishing. (n/t) - TB - 5/27/2007 10:35:41 PM
                    • I'd prefer a mermaid over a sea hag. ;) (n/t) - Lee - 5/27/2007 10:50:39 PM
                  • A good idea (n/t) - Buck Galaxy - 5/27/2007 9:10:19 PM
                • Water? - Jeff F - 5/27/2007 8:12:40 PM
                  • re: Water? - Jeff F - 5/27/2007 8:13:17 PM
                    • No radar image - Raoul - 5/27/2007 10:26:32 PM
                      • re: No radar image - ed - 6/10/2007 2:14:02 AM
                      • The first (an last) words of the first astronaut to come upon the Hole of Mars - edgar - 5/28/2007 9:45:39 PM
                        • "My god ... it's full of stars!" (n/t) - D - 5/31/2007 3:45:59 AM