FC: Autodesk's founder reports gross errors by Limbaugh, CNN, Snopes

[Declan McCullagh <declan () well com>]

---

Date: Sat, 29 Mar 2003 10:24:29 -0800
To: Dave Farber <dave () farber net>, Declan McCullagh <declan () well com>
From: Jim Warren <jwarren () well com>
Subject: Autodesk's founder reports gross errors by Limbaugh, CNN, Snopes
Cc: cnn.feedback () cnn com, "Cross Fire" <crossfire () cnn com>,
   Wolf Blitzer Reports  <WBlitzer.Reports () turner com>,
   "Rush Limbaugh" <rush () eibnet com>, postmaster () snopes com

[If you know John, you know him to be a most ardent stickler for 
facts.  Here, John is not reporting hearsay; he's reporting about what's 
happened on his own server, and images he provides thereon. --jim]

At 12:34 AM +0100 3/29/03, John Walker wrote:
Subject: Sniping at Snopes.com
> Almost everybody's experienced the phenomenon of encountering
> a description in news media of something they know from
> first-hand experience and discovering discrepancies that
> make them wonder about all the stories they *can't* independently
> verify.
>
> The last couple of weeks or so have been interesting at
> Fourmilab.  First of all, some idiot took an image off
> Earth and Moon Viewer (a *flat map* image, mind you,
> *not* a synthetic view from above) and circulated it as
> the "last image taken from Columbia".  This was picked up
> by that noted spaceflight authority Rush Limbaugh, and
> rattled around the Net for a while until it was promptly
> identified as what it was; Limbaugh removed it from his
> Web site within 24 hours.
>
> But of course, once the worms are out of the can, it's notoriously
> difficult to get them back in, especially in this brave New
> Media world.  So, the image has kept popping up and being batted
> down regularly ever since.
>
> All was more or less serene with Earth and Moon Viewer until the
> war started.  Apparently, some bottom-feeders got the idea
> they could watch the bombs fall and tanks roll across Iraq by
> repeatedly viewing Earth Viewer images which, of course, are
> actually generated from a static database assembled from satellite
> imagery dating from 1995-1996.  It didn't help that CNN started
> broadcasting zooms into Baghdad from Keyhole's "earthviewer.com"
> site; if somebody types "earthviewer" into Google, Keyhole
> comes up number one, but guess who's number three?
>
> Anyway, the hit rate on www.fourmilab.ch, which had been hovering
> around 500,000 per day for the last two years suddenly blew the top
> off, resulting in four of the last ten days registering more than
> a million hits.  When this wave first broke over the server, it was
> not pretty--CPU load, which normally runs about 2-3 on this 4 CPU
> Sun E3500, was running about 290 and all 256 Apache server processes were
> blocked waiting for rendered images, causing response time to drop
> into the minute range...which causes more re-clicks, more hits, more
> image rendering requests, greater load, longer delays...ugly.
>
> I've restricted the maximum rendered image size, added a big ugly
> red disclaimer to the results to remind folks they're looking at a
> static image, and limited the number of requests from a given site.
> This, for the moment, has brought things under control and made
> million hit days survivable.  If it takes off again from *this* level,
> I think I'll just bag it and hide out in an armed compound in Switzerland.
> Damn...already did that!
>
> But let's get back to the bogus "Columbia" image.  Just after I'd
> finished implementing the first round of "war emergency" fixes to
> Earth Viewer, what should happen but that image, and its provenance,
> popped up as NASA's Astronomy Picture of the Day for 2003-03-24:
>
>     http://antwrp.gsfc.nasa.gov/apod/ap030324.html
>
> Well, of course, that launched another wave of hits, and another round
> of countermeasures.  NASA correctly identified the image, credited the
> source, and provided appropriate links.  I can't complain and, if Earth
> Viewer didn't have its back to the wall with war hits, I'd actually be
> rather flattered.
>
> Then I happened to visit the:
>
>     http://www.snopes.com/
>
> urban legend site, and what should be the number 4 top search, but the
> very same "Sunset from space" picture!  The hits just keep on coming.
>
> I've visited the Snopes site several times over the last few years,
> generally from links in mail and news discussions and, while there's
> nothing explicitly bogus about the site, there's something about the
> tone which I've found consistently off-putting.  It's reminiscent of
> the too-smug, overly-glib style of the Skeptical Inquirer which caused me
> to let my subscription lapse in the early 80's and, perhaps, set in motion my
> long migration from CSICOP to Psi-perp.
>
> The Snopes analysis of the "Columbia picture":
>
>     http://www.snopes.com/photos/sunset.asp
>
> is typical of this.  Unlike NASA, they did not identify the source
> (although it had been identified on newsgroups long before Snopes
> posted this article), and the Snopes commentary itself contains two
> or three factual errors, depending on how you read it, and misses three
> of the most obvious things which identify the picture as not
> taken from Columbia.  Here is a copy of the comments I sent to
> Snopes:
>
>                  * * *
>
> The image you show on the "Sunset from Space" page:
>
>     http://www.snopes.com/photos/sunset.asp
>
> was generated by the Earth and Moon Viewer on my Web site:
>
>     http://www.fourmilab.ch/earthview/
>
> You can almost precisely reproduce the image shown on your page
> with the following (very long--it may need to be unwrapped)
> URL:
>
> http://www.fourmilab.ch/cgi-bin/uncgi/Earth?imgsize=320&img=learth.evif&opt=-z&lat=36&ns=North&lon=6&ew=West&alt=72&date=1&utc=2003-04-12+19:00
>
> The image shown on your page looks like it was originally
> generated with a larger image size, then scaled to the 320x320
> pixel size shown on your page, accounting for the blurring
> which is particularly evident in the lights on the night side
> of the terminator.
>
> There are several factual inaccuracies in your discussion of this image:
>
> "...this image can't have been both 'taken by the crew on board
> the Columbia' and 'taken via satellite.'"
>     Okay, this is a quibble, but as Columbia was, during its
>     mission, an Earth satellite, the two statements are not, in
>     fact, contradictory.
>
> "Although this images does accurately depict the landforms
> described..."
>     Incorrect.  This picture is a rectangular excerpt from a
>     map image in a cylindrical projection.  There is no
>     viewpoint in orbit around the Earth from which the Earth
>     would look like this.  The distortion toward the poles is
>     especially apparent in the shape of Iceland and the eastern
>     part of Greenland toward the top.  You can see the entire
>     rectangular projection map with the URL:
>
> http://www.fourmilab.ch/cgi-bin/uncgi/Earth/action?opt=-p&date=1&utc=2003-04-12+19:00
>
>     Further, the field of view is ridiculously too wide to be
>     seen from the altitude at which shuttles fly.  The Columbia
>     STS-107 mission flew at an altitude of about 150 nautical
>     miles, or 278 kilometres.  A horizon to horizon view from that
>     altitude centred at the centre of the rectangular image you
>     show may be viewed with:
>
> http://www.fourmilab.ch/cgi-bin/uncgi/Earth?imgsize=320&img=learth.evif&opt=-l&lat=36&ns=North&lon=6&ew=West&alt=278&date=1&utc=2003-04-12+19:00
>
> "...the positioning of lighted cities to the right of the
> day-night terminator line..."
>     Well, subject to the comments above, the lights may be in
>     the correct positions for the *projection*, but the *shape of
>     the terminator* is dead wrong for a picture which purports to
>     have been taken around the start of February.  Note that in the
>     images above, I specified a date around mid-April when the
>     terminator looks like the one in the image you show.  In fact,
>     an image generated with the same parameters except using the
>     illumination for February 1 appears as the following URL
>     displays:
>
> http://www.fourmilab.ch/cgi-bin/uncgi/Earth?imgsize=320&img=learth.evif&opt=-z&lat=36&ns=North&lon=6&ew=West&alt=72&date=1&utc=2003-02-01+17:20
>
>     Think about it--in northern hemisphere winter, the north
>     pole is in constant darkness--hence the picture you show could
>     not possibly represent a date during the last flight of
>     Columbia.
>
>     Finally, the cloudless day and night Earth image database
>     used to create this rendering by the Earth and Moon Viewer on
>     my site is © 1996 The Living Earth® Inc., All Rights Reserved.
>     I am not affiliated with The Living Earth; they grant my site
>     permission to use their database to prepare free rendered
>     images in return for identifying the data source and providing
>     back-links.  Images created from their database by Earth and
>     Moon Viewer should be re-used only with permission from The
>     Living Earth (http://livingearth.com/), and with identification
>     and a back link.  The Living Earth routinely grants this
>     permission for non-commercial use of their images.
>
>     Note that when this image appeared as the NASA Astronomy
>     Picture of the Day for 2003-03-24:
>
>     http://antwrp.gsfc.nasa.gov/apod/ap030324.html
>
>     it was identified correctly.





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