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	<title>Comments on: &#8220;Ghost Cars&#8221; on the I-35W Bridge</title>
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	<link>http://www.nikolasschiller.com/blog/index.php/archives/2007/08/03/1113/</link>
	<description>A Digital Scrapbook for the Past, Present, and Future</description>
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		<title>By: Daniel</title>
		<link>http://www.nikolasschiller.com/blog/index.php/archives/2007/08/03/1113/comment-page-1/#comment-401</link>
		<dc:creator>Daniel</dc:creator>
		<pubDate>Sat, 04 Aug 2007 16:23:04 +0000</pubDate>
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		<description>Nik,

I took a closer look at the entire image source -- and concluded that it&#039;s indeed a fused or pan-sharpened product. This is confirmed by moving objects being &#039;ahead&#039; of the multi-spectral source objects, and those objects remaining &#039;blurred&#039; from the resample to high-resolution.

There&#039;s a number of key areas to look within the imagery, that demonstrate analytical consistency. The highways and bridge  (I-35) are obvious indicators, due to constant flow of traffic in either direction. The train crossing the rail-bridge is also another consistent source due to linear travel direction. You can pick-out and match some of the vehicle movements within the lower-speed urban roadways, and occassionally even match a &#039;ghost vehicle&#039; that has turned vs. its multi-spectral location on an adjacent roadway.

If we actually knew the exact time-lapse between the sensor capture, both multi-spectral and pan -- we would be able to gain a rough estimate chart on speed variations for each vehicle travelling those distances.

So what we&#039;re seeing, is that yes -- it&#039;s the exact same collect time -- but the pan imagery was collected a number of miliseconds after the multi-spectral was captured. That would also give anyone with a trained eye an indicator as to who collected it and what sensor system was used.

This is actually an interesting anomoly to see, especially in aerial. We don&#039;t typically see this kind of sensor and process taking place except with satellite sensors.

Now, I can&#039;t wait for the various arm-chair security non-experts to wage opinions on the weirdness of the &#039;ghost&#039; object anomolies within the press. Seems we have too much of that happening these days, mainly in relation to security.</description>
		<content:encoded><![CDATA[<p>Nik,</p>
<p>I took a closer look at the entire image source &#8212; and concluded that it&#8217;s indeed a fused or pan-sharpened product. This is confirmed by moving objects being &#8216;ahead&#8217; of the multi-spectral source objects, and those objects remaining &#8216;blurred&#8217; from the resample to high-resolution.</p>
<p>There&#8217;s a number of key areas to look within the imagery, that demonstrate analytical consistency. The highways and bridge  (I-35) are obvious indicators, due to constant flow of traffic in either direction. The train crossing the rail-bridge is also another consistent source due to linear travel direction. You can pick-out and match some of the vehicle movements within the lower-speed urban roadways, and occassionally even match a &#8216;ghost vehicle&#8217; that has turned vs. its multi-spectral location on an adjacent roadway.</p>
<p>If we actually knew the exact time-lapse between the sensor capture, both multi-spectral and pan &#8212; we would be able to gain a rough estimate chart on speed variations for each vehicle travelling those distances.</p>
<p>So what we&#8217;re seeing, is that yes &#8212; it&#8217;s the exact same collect time &#8212; but the pan imagery was collected a number of miliseconds after the multi-spectral was captured. That would also give anyone with a trained eye an indicator as to who collected it and what sensor system was used.</p>
<p>This is actually an interesting anomoly to see, especially in aerial. We don&#8217;t typically see this kind of sensor and process taking place except with satellite sensors.</p>
<p>Now, I can&#8217;t wait for the various arm-chair security non-experts to wage opinions on the weirdness of the &#8216;ghost&#8217; object anomolies within the press. Seems we have too much of that happening these days, mainly in relation to security.</p>
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		<title>By: Daniel</title>
		<link>http://www.nikolasschiller.com/blog/index.php/archives/2007/08/03/1113/comment-page-1/#comment-400</link>
		<dc:creator>Daniel</dc:creator>
		<pubDate>Sat, 04 Aug 2007 01:47:18 +0000</pubDate>
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		<description>It looks like a fusion or even just a pan-sharpening effect that&#039;s common, where the multi-spectral&#039;s been taken slightly offset in timing from the pan. But you typically work with aerial, correct? Or was this satellite?

If you look at the vehicles -- you&#039;ll notice that the semi-tractor/trailer and a couple of the cars are &#039;blurry&#039; compared to the &#039;ghosts&#039;. But, those vehicles are aligned in the same lanes at visually the same distance (depending on which way traffic is moving, considering opposite lanes). This would indicate to me what I mention above.</description>
		<content:encoded><![CDATA[<p>It looks like a fusion or even just a pan-sharpening effect that&#8217;s common, where the multi-spectral&#8217;s been taken slightly offset in timing from the pan. But you typically work with aerial, correct? Or was this satellite?</p>
<p>If you look at the vehicles &#8212; you&#8217;ll notice that the semi-tractor/trailer and a couple of the cars are &#8216;blurry&#8217; compared to the &#8216;ghosts&#8217;. But, those vehicles are aligned in the same lanes at visually the same distance (depending on which way traffic is moving, considering opposite lanes). This would indicate to me what I mention above.</p>
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