Re: [mat-wg] suggestions for atlas service
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To: Robert Kisteleki robert@localhost
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From: Piotr Strzyzewski <Piotr.Strzyzewski@localhost
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Date: Wed, 18 May 2011 11:43:18 +0200
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Cc: mat-wg@localhost
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Organization: Silesian University of Technology, Computer Center
On Fri, May 13, 2011 at 11:56:01AM +0200, Robert Kisteleki wrote:
> > 2. Better probe location display. Currently I host two probes, both 10cm
> > one from each other, put into two different ASes. When I have put
> > exactly the same geo data, the "display" mechanism put one of it onto
> > the other one.
>
> This is a tricky one.
>
> Background information: we'd rather not publish the exact geo-coordinates
> the hosts put in, because of privacy concerns. So what we do now is that
> whenever we display probes on a map, we round the geo-coordinates to two
> digits. This introduces a "random" error of up to 1000 meters or so. (If you
> zoom in on Amsterdam, where we have enough probes, you'll see that all
> probes are aligned into a neat, sparse matrix; it's because of this.)
It seems to be relatively easy to round the geo-coordinates to two
digits (as you do it right now) and then add some random number from
0.00000 to 0.00999 to it.
Piotr
--
gucio -> Piotr Strzyżewski
E-mail: Piotr.Strzyzewski@localhost
