I'm not very familiar with it but there has been some work done along
these lines towards creating maps for the blind at UCSB, by Reg
Golledge, among others. Check out:
http://soundscapes.geog.ucsb.edu/
and
http://soundscapes.geog.ucsb.edu/ruscc/ruscc.htm
Greg
David Fawcett wrote:
Perhaps you could save each track as a discrete file on CD or disk.
Then, when a person using this audio tour gets within the specified
buffered distance from the hoodoo, the appropriate track fires up....
On 6/6/06, *Rich Gibson* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
I agree that georeferencing audio files is a Good Thing. I did some
work on georeferencing the audio files from my Olympus voice recorder.
They have this 'DSS' file format. It has a header that is readable
so I wrote the Audio::DSS perl module to read the meta data.
Of interest is the starting time, ending time (last edited time), and
track length. I then synced that up with track logs to create a
continuous georeference.
Having a single point for an audio recording is probably a good
simplification, but it sort of bugs me. I often do sound recording
while I'm moving. I would like my recordings to be represented as
tracks, rather than single points. Back 'in the day' I had a number
of clever names for this. I just checked and all the domains I
considered are now being used to sell google ads or cell phone ring
tones :-)
The simplest use case is for audio travel annotations: local history,
geology, etc. A person can record a commentary while traveling ( or
create one after the fact to match a specific area ), add the right
meta data, including locations for the track, rather than a single
point, and rely on sufficiently magic technology to adjust the
playback to match the actual speed of the listener.
So if something was timed to be heard while travelling 60 mph, it
could be adjusted with pauses, or pitch compression, to match your
actual speed. The content creator can then also embed 'key frames'
into the audio. For example, 'at 55 seconds in, your should be at
this location' which allows the commentary to have things like 'look
at the road cut into late cretaceous shale on your left, then look
right at the alluvial fan into the dried lake.'
(okay...the lines are not truly continuous, since they rely on a
series of individual positions, but continuous enough. As the quote
on electronics goes 'we don't actually know if DC current exists,
since we have not been able to measure any DC source for long
enough...maybe it just cycles very slowly :-)
On 6/3/06, Russ Nelson <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
> http://russnelson.com/georeferencing-mp3s.html
<http://russnelson.com/georeferencing-mp3s.html>
>
> --
> --my blog is at http://blog.russnelson.com | When immigration is
> Crynwr sells support for free software | PGPok | outlawed, only
criminals
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immigrate. Illegal
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causes crime.
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--
Rich Gibson
Chief Scientist, Locative Technologies
http://mappinghacks.com
http://geocoder.us
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Gregory Yetman
Center for International Earth Science Information Network (CIESIN)
Columbia University
URL: http://www.ciesin.columbia.edu/
e-mail: gyetman (at) ciesin.columbia.edu
tel: (845) 365-8982
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