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02-21-2012, 10:34 AM | #1 |
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OT: Strange aircraft seen at Perth Airport.
Things one does when one doesn't have an M3 to cruise around in... Saw this on Nearmap.
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02-21-2012, 06:32 PM | #4 |
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02-21-2012, 06:43 PM | #5 |
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Not photoshop - photostitching.
When we take these aerial shots they are individual images, and we have to stitch them together. While the photos are taken sequentially in a fly over, they are separated in time by a second or so and their camera position moves as well (by the distance we fly in the plane). We fly a grid, so after flying one line we turn and fly back in the next line, with an overlap in the images we take. We then stitch them together into one big image, then cut them up into downloadable blocks and resolutions depnding on the need. Nearmap and Google Earth (and Microsoft) buys satellite images and plane images to give different resolutions for different user zooms levels. What we see here is just a stitching together of shots taken a few minutes apart on two adjacent lines. The plane either ws turned around or as it looks a bit different, was replaced by another plane in the same location. You can see evidence of the paralax in camera location in the dotted runway lines to the left of the plane. There is a metre gap in one of the lines just in front of the wing.
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02-21-2012, 07:26 PM | #7 |
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Well explained Dr Stig!
I also doubt that there are three planes parked at positions NJ3, 5 and 6 (on the right) at the same time, especially when NJ6 is boarding. An interesting photo. Pretty good timing and positioning with the two planes in a near identical position in the stitched photos. And both askew of their ground guide markings by the same margin. |
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02-21-2012, 09:04 PM | #8 |
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The stitching has been done manually here I would guess.
NOte the shadows of the various planes. There is more than a hours difference in the shadows, closer to 2 hours, 11 til 1pm kind of move. See the shadows marked Shadow A, and those marked Shadow B. The Shadow B planes are circled by the shadow A planes. There may have been a reason for having to stitch in a patch from a later run. The people on the tarmac are all in the Shadow A time frame, as are the light poles. SO the two planes in question with Shadow B have been cut on later. Could be a nearmap or source data analyst having fun on his break as well.
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02-23-2012, 12:48 AM | #10 |
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Dr Stig - you are a fountain of knowledge and you have an awesome job! I've always wondered whether the images that we (the public) have access to are of lower resolution than the images accessed by say, the local city council who may be checking for non-council approved constructions etc.
I was thinking of knocking a few cruise missiles together out of drainpipes and cardboard and seeing how long before the local constabulary come knocking on my door !
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02-23-2012, 04:36 AM | #12 | |
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Quote:
Twas about 10 years ago and I was the r&d manager for a large consulting house that owned an aerial survey company. I used to stay interested in what they were up to though as I changed jobs in the company. Yes, the councils get high res data. They pay for it of course. You can commission any of the survey companies to do a flyover at any resolution you like if they don't have it already in their databases. Microsoft commissioned a 3 d survey a few years back to render 3 d images of the major capitals As competition to google earth. Thousands of terabytes of images, all sent to India to be stitched together.I have always wondered what happened to the initiative.
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02-23-2012, 06:57 PM | #13 |
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02-23-2012, 10:07 PM | #14 |
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WTF?
To quote the sea captain on the Blackadder episode where he tries to outdo Sir Walter Rayleigh... "You have a woman's hands!"
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