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Throwing a bunch of uncalibrated sensors out there with no standards
for their placement is not going to get you much useful data. It
might be fun to look at your own track and see where you get hot
spots but it's not going to do serious researchers much good.<br>
<br>
And didn't we discuss a standardized type-length-value extension
scheme a while back? Aside from OpenTRAC, that is. At the very
least I think any more extensions to the format need a formal
definition, maybe a BNF grammar, to guarantee that everything is
unambiguous and parseable.<br>
<br>
Scott<br>
N1VG<br>
<br>
<div class="moz-cite-prefix">On 4/3/2017 7:56 AM, Robert Bruninga
wrote:<br>
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<p class="MsoNormal">Here's a project. Add a $4 Methane
detector to your APRS mobile and help us find the bad
methane leaks. Google is adding it to their maping
cars. Maybe Amateur Radio and APRS could help?<br>
<br>
<a moz-do-not-send="true"
href="https://mail.google.com/mail/u/0/#inbox/15b2521854ccaa63">https://mail.google.com/mail/u/0/#inbox/15b2521854ccaa63</a></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
Apparently the 2:1 advantage of replacing the high
carbon emissions of coal with natural gas, overlooks the
fact that the methane released with natural gas
extraction methods is 84 times worse than carbon as a
green house gas and may more than offset any advantages.</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Just one
methane leak a few years ago did more damage than about a
million cars a day before it was plugged months later<br>
<br>
.<a moz-do-not-send="true"
href="http://www.businessinsider.com/methane-gas-leak-porter-ranch-los-angeles-disaster-largest-in-history-2016-1">http://www.businessinsider.com/methane-gas-leak-porter-ranch-los-angeles-disaster-largest-in-history-2016-1</a><br>
<br>
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<p class="MsoNormal">Anyway, a $4 sensor and a tiny processor
could add a flag to our mobile packets somehow when levels
exceeded some background level</p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Though I
am not sure if the sensitivity of these $4 sensors is good
enough to find the outdoor area low level leaks, or only
detects high concentrations...</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I wish I
had the time to make one and experiment with the concept.
It would make a great fun project. I used to thing a cheap
radiation detector would let APRS contribute to plotting
radiation hot spots, but I fear the natural gas leaks and
fracking damage is going to kill us first.</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">My
thoughts on adding this to APRS is to simply have a
processor send out a modified STATUS text when a detection
is made. Since APRS was designed around the status being
merged-on-receipt with the most recent posit, this is a
way of nailing down the location of high methane levels or
leaks.</p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Status
could simply be >CH4=XXX where XXX is the reading.
Format of XXX will be determined to give reasonable scale
over expected detections. Then the APRS map could
selectively plot any detections.</p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Anyone
have more experience with these sensors and the levels of
detections expected?</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Bob,
wb4apr</p>
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