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Actually it is incredibly accurate only if you use PPS output otherwise
idea of having atomic clock in your pocket goes out of the window.<br>
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Richard Guest pravi:
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<pre wrap="">GPS essentially *is* accurate timing... GPS satellites are flying atomic clocks.
Trimble has a good GPS tutorial - <a class="moz-txt-link-freetext" href="http://www.trimble.com/gps/index.shtml">http://www.trimble.com/gps/index.shtml</a>
Almost all Digital Seismometers have a GPS interface to get the
accurate timing they require.
On 20/04/2008, Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com"><bmk789@gmail.com></a> wrote:
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<pre wrap="">On Sat April 19 2008 5:52:14 pm Ortwin Regel wrote:
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<pre wrap="">Yes, AFAIK GPS requires accurate time to function.
Ortwin
On 4/19/08, Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com"><bmk789@gmail.com></a> wrote:
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<pre wrap="">On Sat April 19 2008 5:29:50 pm Richard Guest wrote:
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<pre wrap="">Yeah, it's an interesting idea.
I read something similar on Evil Mad Scientist
<a class="moz-txt-link-freetext" href="http://www.evilmadscientist.com/article.php/seismometry2">http://www.evilmadscientist.com/article.php/seismometry2</a>
The detection/pinpointing part requires both accurate detection of
shaking and timing - obviously the timing is critical for
triangulation.
I think the *cool* factor for something like this would be the ability
to measure a persons actual physical experience of an earthquake.
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<pre wrap="">There
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<pre wrap="">are *lots* of existing seismometers that will do the *fixed* point
detection a whole lot better, but none (that I know of) that will be
(relatively) unobtrusive to the users daily life and still give an
actual measurement
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<pre wrap="">of
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<pre wrap="">physical shaking intensity.
You shouldn't have to wait that long for e/q info... In New Zealand
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<pre wrap="">the
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<pre wrap="">news media mostly regurgitate what we post on
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<pre wrap=""><a class="moz-txt-link-freetext" href="http://www.geonet.org.nz/">http://www.geonet.org.nz/</a>
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<pre wrap="">There's near-realtime shaking info on the front page, and if there's
actually an earthquake people can submit a "Felt Report" to tell us
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<pre wrap="">how
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<pre wrap="">they experienced it.
It would be really cool to see how a personal accelerometer trace
correlates to the fuzzy-logic of the felt report!
End thoughts...
--
Rich
On 20/04/2008, Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com"><bmk789@gmail.com></a> wrote:
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<pre wrap="">After recently having a 5.2 earthquake here in the Midwest, I
realized the potential in the Openmoko for detecting/pinpointing
earthquakes. What this
is mostly dependant on is the accuracy of the accelerometers in the
Freerunner. From what I've read, Macbooks' accelerometers and
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<pre wrap="">detect
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<pre wrap="">and
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<pre wrap="">measure earthquakes fairly accurately. [1] If the Freerunner's
accelerometers are precise enough and it could be attached to a
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<pre wrap="">fixed
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<pre wrap="">ground,
we could use GPS to retreive an accurate location and record and
upload accelerometer data to a database. Many different devices
running this could
provide intensity levels at many different locations and (at least
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<pre wrap="">fairly
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<pre wrap="">accurately), pinpoint an epicenter. This data could become useful
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<pre wrap="">to
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<pre wrap="">researchers and would provide information about an earthquake faster
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<pre wrap="">than
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<pre wrap="">almost any news network would provide.
Thoughts?
[1] <a class="moz-txt-link-freetext" href="http://www.suitable.com/tools/seismac.html">http://www.suitable.com/tools/seismac.html</a>
--
----
Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com"><bmk789@gmail.com></a>
<a class="moz-txt-link-freetext" href="http://onedollarlinux.com">http://onedollarlinux.com</a>
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<pre wrap="">Wouldn't GPS provide an accurate time? I thought GPS sends its own
official time, like an atomic clock. I could be wrong. Anyone know
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<pre wrap="">more
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<pre wrap="">about this?
--
----
Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com"><bmk789@gmail.com></a>
<a class="moz-txt-link-freetext" href="http://onedollarlinux.com">http://onedollarlinux.com</a>
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Please avoid sending me Word or PowerPoint attachments.
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<pre wrap="">When I used a bluetooth GPS with my laptop, I notices the gpsd output had a
different time than my system clock showed, so I assume GPS provides its own
clock.
--
----
Brandon Kruger <a class="moz-txt-link-rfc2396E" href="mailto:bmk789@gmail.com"><bmk789@gmail.com></a>
<a class="moz-txt-link-freetext" href="http://onedollarlinux.com">http://onedollarlinux.com</a>
BLOG - <a class="moz-txt-link-freetext" href="http://onedollarlinux.com/personal/">http://onedollarlinux.com/personal/</a>
Please avoid sending me Word or PowerPoint attachments.
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<pre wrap=""><!---->
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