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there's a few UFO videos that are shot

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from a moving helicopter where the

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camera tracks what seems to be a very

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fast-moving object there's this one from

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Aguadilla in Puerto Rico and there's the

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go-fast video from the US Navy a simple

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explanation for these is that the

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apparent high speed comes from parallax

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the object is closer to the camera than

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the background so changes in angle

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result in what looks like high speed

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relative to their background you can see

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this with this hawk that looks like it's

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going 200 miles per hour over the ground

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a little bit diagonally I did a little

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experiment to try to demonstrate this

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effect with a ping-pong ball suspended

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from a tree but the best demonstration

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of this effect now comes from Tom

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Churchill of Churchill navigation with

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this video of a mylar balloon film from

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a helicopter after the cameraman starts

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tracking the balloon it looks like it's

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moving incredibly fast over the

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background but we can see it's just a

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balloon drifting in the wind and the

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apparent motion comes from a combination

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of the helicopter motion and the

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magnified movement due to the zoom

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factor so the video we're looking at

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here is in the earthscape viewer from

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church on navigation this is a great

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viewer not only does it show you the

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video but it shows you a lot of data

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that has been collected along with the

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video and a simple level that shows you

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where the camera is the helicopter right

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here and it shows you where the camera

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is pointing this red line shows you

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where the camera is pointing and we can

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move around in the video and you can see

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at any point what the field of view is

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which is this red region here which

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corresponds to what you see in the video

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you see here the front edge of the field

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of view is the bottom edge of the video

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here in the middle of the river and then

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the far edge is the the far end and then

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these are the sides so you can see

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exactly what you're looking at in the

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map like we could see for example that

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these these storage tankers here are

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going to be right here on the edge of

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the river and we can probably change to

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aerial imagery

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and we'll see zooming in there we are

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the these storage tankers here so it's

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very accurate and telling you exactly

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what you're looking at and in terms of

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this the this balloon that we're looking

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at here the computer here is thinks

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we're tracking something on the ground

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so if we open this up and add in the

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speed and the target speed we'll see the

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speed of the helicopter here is being

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shown as around 20 to 25 meters per

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second and the target speed if we add

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that in target speed is a hundred to 150

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or 200 or 300 plus meters per second and

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that's because it thinks the targets on

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the ground so it's calculating it as if

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it's a ground-based target because it's

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in the air now if it was moving on the

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ground it would be moving at those

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speeds so that would be perfectly

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accurate so what we've got to do is try

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to figure out where the balloon actually

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is relative to the camera and then we

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could figure out where the where the how

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far it actually is and how fast it is

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actually moving and I think what I'll do

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is I'll try using this building here

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which I believe we can see over here and

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seeing how big this building edge here

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is relative to this balloon and hence

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wish you were to figure out how far away

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the balloon is if we know the size of

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the balloon which I'm going to assume as

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a standard say 18 inches maybe 2 feet

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probably 18 inches wide mylar balloon

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and this building I will find the size

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of in Google Earth all right I found

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this building in Google Earth so let's

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measure some things let's zoom this up

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and zoom out this is the position of the

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helicopter the position of this building

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and I've drawn a line between the two so

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we can use that to measure how

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it is it is 1751 meters so about 1750

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meters from the helicopter to that

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building this is you know approximate

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but it's pretty good so now how long is

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the roofline now we're a bit of an angle

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so what I've done is I've drawn this

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line from here to here just to show how

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long the roofline would be at that angle

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and we can measure that that is 33

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metres so what is the apparent size of

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this balloon at that distance well if

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the roofline is 33 metres the balloon is

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about one-sixth of that roofline so

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one-sixth of 33 is about 5.5 let's call

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it around 5 meters and the balloon size

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is 18 inches let's say that's around 1/2

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a meter so if it looks like it's 5.2 if

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it looks like it's 5 meters in size but

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it's actually half a meter in size that

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means it's appearing 10 times as big as

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it actually should be at that distance

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which means the actual distance is 1/10

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of that and we can put that in on the

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map here this is one tenth of the

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distance from the helicopter to that

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building so approximately somewhere

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around here and that means that we can

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if we go back to the earth scape viewer

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and we look at the actual path here we

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know that it's going to be about one

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tenth of this distance here and again

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that's going to be around here so now we

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know that the balloon was somewhere

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around this region it makes a lot more

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sense if we look at the actual movement

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of the helicopter I'm going to zoom in

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here

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helicopter is you can see the helicopter

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look at the red line coming out of the

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helicopter II it focuses around this

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area here and you go through the entire

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movement any kind of pivots

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around that region there's a red line

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here and if you go down and here there's

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another red line the red line here red

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line here and they're all focusing

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around this region and even down here is

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looking up it's all around this region

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so I think what's actually happening is

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the helicopter view for a flew from up

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here to down here it's sort of balloon

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around here and as it went through that

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movement

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it basically pivoted around this balloon

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here which was hardly moving at all and

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it looked like it was a balloon moving