Exposing PseudoAstronomy

August 15, 2012

Understanding Lunar Reconnaissance Orbiter Wide-Angle Camera Images


Introduction

In an update to Mike’s blog post from yesterday, Mike displays further lack of reading comprehension plus an inability to understand images and image processing — something that he claims to be better at than I.

Another Conspiracy Claim

The crux of Mike’s bone this time is that the WAC image I linked to has a “Venetian Blinds” effect going on. Why?

Well, Mike says he’s an engineer, so one would think that he would know of the ways to look into this. I’ll help those of you who don’t have Mike’s expertise that he did not exercise: The camera employs 7 filters, and they act like a grating, spreading the light out across the detector. It’s just how the image was recorded. I happen to use command-line software to reconstruct the images, and it can be fairly obtuse. But, 10 seconds of Google searching shows that there’s apparently easy-to-use freeware software out there to do this all by yourself.

If you’d like to read more about it, here’s the official journal paper outlining the craft and its instruments. If you do a google scholar search, then you can find a free PDF copy of it. Here’s a paper specifically on the camera, but I don’t see an obvious link for a free copy.

To quote from the 2007 paper:

The seven-band color capability of the WAC is provided by a color filter array mounted directly over the detector, providing different sections of the CCD with different filters acquiring data in the seven channels in a “pushframe” mode. Continuous coverage in any one color is provided by repeated imaging at a rate such that each of the narrow framelets of each color band overlap.

Every WAC image looks like that coming raw from the LROC website, though I also gave you a link to the global mosaics where you can look at the region yourself, on your own, without needing to assemble the WAC. Again, the coordinates are 174.34°E, -8.97°N.

So to recap: That’s how the WACs look, and it’s a simple matter to process them into a human-happy image. This has been in the literature at least since 2007, and if Mike bothered to look, he’d have seen that EVERY WAC image looks that way and requires reassembly. Why don’t they do that automatically for public consumption? I have no idea. Possibly because if revised algorithms come out to do an incrementally better job, they wouldn’t have to reprocess everything. Same reason the NACs are not properly georectified.

Contrast that with Mike’s conspiratorial ideas:

Hmm. I guess maybe the guys at NASA don’t want anybody sniffing around this area, do they? This is just more proof that you can’t trust digital images NASA produces. They must have posted this temporarily while they’re busy painting over the Ziggurat.

So the truth is, neither of the images he’s posted show anything like what he’s claiming, and they sure as hell don’t show the Ziggurat area in sufficient resolution to make a judgement about it.

Do you know what “truth” means? I mean, really? Another conspiracy? Pretty poor one considering that anyone who looks can easily figure out how to assemble the WACs. And anyone who looks can find out why they look that way.

Another Look at the LROC Images

Here, I’ll do more of your work for you. Here’s a screenshot of part of the NAC frame, from the link I gave before, that covers part of the area you claim the ziggurat to cover. I’ve even superposed part of the footprint of your ziggurat over the image, and this is far from full-res. (Note, this is a bit different from the footprint I showed towards the end of the video; I was a bit off then and a reexamination has led me to revise the approximate footprint. Figuring out exactly what’s going on between the oblique Apollo image and the rectified WAC/NAC images is a tad hard.)

NAC of Alleged Ziggurat Area

NAC of Alleged Ziggurat Area, Approximate Ziggurat Footprint in Green (click to enlarge)

The footprint above is obviously unconstrained off the left side of the NAC. But, here’s a family portrait where I think I have it better figured out:

WAC and NAC of Alleged Lunar Ziggurat

WAC and NAC of Alleged Lunar Ziggurat (Notice, None Present) (click to enlarge)

Let’s see, what else can I think of with what I’m showing that might give Mike a conspiratorial claim … okay, a few potential trivial things that could set the conspiracy-minded off:

  • The WAC has wavy borders for reasons I discussed in my last podcast episode — basically, it’s a topography and spacecraft pointing correction.
  • The ziggurat footprint is a weird shape because the original Apollo shot is very much oblique (a perspective) and when rectified to a lat/lon gird as if you’re looking down on it, it is elongated and not square — you can increase the height (and rotate by 180°) the Bara/Hoagland image by ~5x to get an idea of what it would look like.
  • North/South are flipped if you look at the images on the LROC website — again, that’s just how they’re sent back to Earth and automatically set up for the web interface, nothing conspiratorial as it’s clearly documented for anyone who looks.
  • On the ACT-REACT map that I linked to above, if you turn on NAC footprints, there does not appear to be one that covers the region occupied by the claimed ziggurat. This is because they are using an earlier set of footprints (this is a recent NAC), but if you use the search for the coordinates elsewhere on the site, you’ll find this one.
  • There are deep shadows because the sun was only 15° above the horizon when the image was taken. Since I have no idea why that image was taken (I’m not on the science/imaging team), I can’t guess as to why it was taken at that sun angle, but it’s entirely possible that it just happened to be a region not covered yet by NAC and they had a spare moment with the camera. But that lit part in the center of the NAC that I show is the left half of the claimed ziggurat (remember it’s rotated 180° in Mike’s version, so North is pointing down in his).

Final Thoughts … For Now

That’s about all I can think of, though I’m certain that Mike will find something else or just claim I’m lying and these images don’t show what I claim them to show or that I’ve now shown that the images he claimed were mythical now have two members but I need to find others. I guess we’ll see.

Oh, and it might be worth recapping at this point: This was never originally about Mike Bara. This was about a claim made by Richard Hoagland about an image he had that I then did a short analysis on and showed was likely hoaxed by someone. It’s turned into something with Mike because he has chosen to vehemently defend it, though his defense has been made of name-calling and conspiracies.

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