[OSGeo-Discuss] Finding position based on horizon profile?

Stephen Woodbridge woodbri at swoodbridge.com
Tue Mar 29 07:52:46 PDT 2011

These all are pretty cool, but all seem to work based on knowing the 
current location, which is is the unknown in Michael's hypothetical 
problem. But that said some of the tech behind these tools might be 
useful in comparing photo to a potential reference image.

This is a very interesting and intriguing problem.


On 3/29/2011 10:28 AM, Mr. Puneet Kishor wrote:
> On Mar 29, 2011, at 9:23 AM, Ian Turton wrote:
>> On 28 March 2011 16:48, Michael P. Gerlek<mpg at flaxen.com>  wrote:
>>> Consider the following hypothetical problem:
>>> Assume we have a good elevation data set for a large region of
>>> the earth -- say, an entire mountain range.  Now let's say we
>>> have a photograph taken from the ground, the horizon of which
>>> shows the profile of a couple of the mountains in that range.
>>> Can you tell me where the photograph was taken from?
>>> Any pointers to research in this area would be appreciated.
>> I think that http://www.heywhatsthat.com/ does some of  what you
>> want. I'm on a very slow hotel internet connection so I can't
>> actually get it to load just now. But my Delicious tags seem to
>> indicate it's an answer.
> Yes, that is the one I have been thinking of since the start of this
> thread. Thanks Ian, for suggesting heywhatsthat.com. It was pointed
> out either on this list or on geowanking a long time ago, and I just
> couldn't remember it. It is pretty cool.

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