From: Brooke Clarke<[email protected]>
Subject: Re: Shadow Forensics
To: "'Sundial Mailing List'"<[email protected]>
Date: Friday, July 8, 2011, 3:10 PM
Hi Brent:
You can go the other way, that's to say if you know the
location you can
determine two possible date-time pairs.
http://www.prc68.com/I/Nav.shtml#Bg
Have Fun,
Brooke Clarke
http://www.PRC68.com
Fred Sawyer wrote:
See the Obsession episode from season 2 of
NUMB3RS. I consulted with
the producers on that episode to develop a way to use
shadows in
photographs to determine the location, given the date
and time of the
photo.
Fred Sawyer
On Fri, Jul 8, 2011 at 4:40 PM, Brent<[email protected]
<mailto:[email protected]>>
wrote:
Hello again;
I was looking at an aerial
photograph of a piece of property with
a surveyor.
We started to discuss when the
photo was taken.
We could tell by the brown
vegetation that it was probably late
summer here in So.
California.
I also noticed a shadow cast
from a telephone pole.
I think by measuring the
height of the pole, the length and angle
of the shadow I might be able
to figure out what day of the year
it was taken and the time. I
would have to know the latitude and
longitude to do this. I knew
the top of the photo was north.
I started to think if I only
knew the day and time the photo was
taken I might be able to
determine the latitude and longitude.
So I wonder if police ever use
shadows in their investigations?
For example, a video of a
terrorist holding a hostage. The hostage
holding a newspaper showing
the date. They are outside with
visible shadows being cast.
Could we figure out where they are
holding the hostage?
How about if the police say I
ran a Redlight at 3pm on a certain
date and they have a
photograph to prove it.
Maybe if they were wrong, I
could prove my innocence by the
shadows cast by my car.
So guess the big question is,
does anyone make practical use of
shadows?
thanks again;
brent
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