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

Peter Batty peter at ebatty.com
Mon Mar 28 20:07:43 PDT 2011

Dave, there's a (non open source) augmented reality application for the
iPhone and Android that shows you what peaks you are looking at through your
phone camera.

They say that all the data they use comes from OpenStreetMap (see the FAQ).

Not sure if this is solely using the compass or whether it does image
recognition also.

On Mon, Mar 28, 2011 at 7:57 PM, Dave Patton <davep at confluence.org> wrote:

> On 2011/03/28 1:48 PM, Michael P. Gerlek 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?
> Something I've been interested in is sort of the
> reverse problem - knowing where a photograph was
> taken(e.g. you have a GPS waypoint), and maybe
> even a bearing (e.g. from a compass), can you
> tell me what mountains are in the photograph?
> Because of the potential viewscape, having good
> elevation data for "an entire mountain range"
> may not be sufficient. For example:
> http://members.shaw.ca/davepatton/photos/boise2.jpg
> That was taken On the Pinecone Lake Trail, near
> Squamish, B.C., Canada. The view looks past Hopefull
> Meadows over the Boise Valley, with Mount Baker
> (Washington State, USA) in the distance.
> --
> Dave Patton
> CIS Canadian Information Systems
> Victoria, B.C.
> Degree Confluence Project:
> Canadian Coordinator
> Technical Coordinator
> http://www.confluence.org/
> Personal website:
> Maps, GPS, etc.
> http://members.shaw.ca/davepatton/
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