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#1
ELeFevre

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Most of you are probably aware of the acquisition of keyhole by Google and the services they will be providing. Very fun and interesting stuff. If not, then here you go.
Here's the link

I thought the Keyhole service was going to be free, but apparently they are still charging. But you can trial the software for free.

Also check out the Quickbird imagery now being served on Googles map engine. Here's the link
For the time being, high resolution imagery seems to be limited to major U.S. cities. I'm sure this going to change soon enough. Erin



#2
Martin Gamache

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My biggest gripe so far is with the unprojected satelite imagery, I think it is unprojected, anywas it is heavily distorted. Is it a safe bet to assume most user won't notice or care? I wonder how much overhead it would add to reproject the imagery on-the-fly.

One cool trick, you can get the lat/long location of a geocoded adress by looking at the link created by the link to this page function. Once they have imagery for the world I can see that being very handy.

mg

#3
ELeFevre

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For the time being it looks like they are using a mosaic of images ranging from 15m resolution (images from Earthsat, I think) and of course the DigitalGlobe Quickbird stuff (1-2m), thus the distortion. I'm not sure if it's being projected or not?

And really I think the average user who wants to get a glimpse of their neighborhood isnt going to know any better. For those of who have experience viewing and playing with a Quickbird scene in a remote sensing program, are going to feel little short changed. I have the feeling this is all going to change in the near future. Google seems to strive for perfection in everything they do. I bet we can expect more the same... Erin



#4
Martin Gamache

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Erin,

I'm not talking about resolution or image distortion, in fact I find all the imagery very good. My problem is with the geometric distortion. Compare these two images for what I mean:

Google Image of my neighborhood


Boston Atlas Mass State Plane Feet Image of same area


The Google sattelite image almost looks like an oblique perspective, while the Google map is definitely using a less distorting projection. Check out how distorted the pond looks in the satelite view if you zoom out a bit.

I guess the lack of a scale bar also kind of bothers me, but I'm sure that will get fixed eventually.

#5
ELeFevre

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Ahhh. I see it now. Maybe it's a bug in the system? I checked my own neighborhood and came up with similar results. However, I'm not convinced the distortions are as quite as bad as they are in you neighborhood:) Better start looking for new house! Erin

My highly distorted neighborhood



#6
Hans van der Maarel

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I guess the images are unprocessed. Probabely to save time and money. In some cases there's noticable color differences between two images.

Anyway, since my country isn't covered by Google yet:
My town

It's an aerial photo of about 12 years ago... My house isn't even on it, it was only built 7 years ago.
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#7
Martin Gamache

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Erin,

It may not be as obvious in your image because of the lower resolution. I've seen this oblique perspective in almost all the high res imagery I 've checket out.

Hans,

Are those old fortifications around your town? How old is that image? ;)

#8
Hans van der Maarel

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Martin,

Yes, that's the old fortifications around my hometown (Klundert). The image is from 1992 or 1993 iirc. The fortifications are obviously older. 1625 or thereabouts. They used to encircle the entire village but in the late 19th, early 20th century parts have been demolished.
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#9
ELeFevre

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Erin,

It may not be as obvious in your image because of the lower resolution. I've seen this oblique perspective in almost all the high res imagery I 've checket out.

Hans,

Are those old fortifications around your town?  How old is that image? ;)


Yes, your absolutely right. I was just joking around:) E.



#10
Nick Springer

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Here's our small town in New Jersey (our house is exactly in the center, to the left of the big patch of green trees and the cemetary - sorry, no address). Bet you didn't know New Jersey could be so green and rural :P

I didn't notice the distortions until Martin mentioned it but now it bugs the heck out of me. Thanks a lot :)

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#11
Martin Gamache

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sorry, no address

yeah that was dumb of me!!!

#12
Hans van der Maarel

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I'm wondering whether or not (some of) the images have undergone some kind of editing to hide 'sensitive' information...

Take for example this one:
USS Hornet at Alameda

This is a museum ship and you can easily make out the number painted on the flight deck.

However, compare it with this one:
Another carrier, at Everett, WA

This one is in active service and even though there should be a number on the flight deck, it's not there.

Different countries have different rules as to what is and is not allowed on maps or other geographic products that are accessible to the general public. I wonder if that's the case here as well.
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#13
Nick Springer

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That ship is the USS Abraham Lincoln which just returned in March from Tsunami relief duties. Modern aircraft carriers have a much subtler numbering style on the flight deck, and even at full resolution, it's hard to tell on the Keyhole image of it is there or not.

Here is an example of the number on the USS Abraham Lincoln

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#14
Hans van der Maarel

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I figured it would be the Abraham Lincoln, as that's the only one whose homeport is Everett.

Still the question remains... Has there been some editing?
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#15
ELeFevre

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I don't know, Nick...shouldnt we be able to see the big number "12" on the USS honest Abe that we can see in the pic you provided? I smell an editing conspiracy! Erin






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