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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">That link was no good. This one describes the Google car methane detection project better:</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><a href="https://www.citylab.com/cityfixer/2017/03/google-street-view-cars-methane-leaks/520719/">https://www.citylab.com/cityfixer/2017/03/google-street-view-cars-methane-leaks/520719/</a></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">And it shows the outstanding difference between Boston with old pipes having leaks everywhere and a newer city with hardly any…</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">And we can add Methane to the Hazards symbol overlay set as. “MH”. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Not only the greenhouse problem, but CH4 is not detectible by humans senses… a colorless, odorless, tasteless gas.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Robert Bruninga [mailto:<a href="mailto:bruninga@usna.edu">bruninga@usna.edu</a>] <br><b>Sent:</b> Monday, April 03, 2017 10:56 AM<br><b>To:</b> TAPR APRS Mailing List<br><b>Cc:</b> Robert Bruninga<br><b>Subject:</b> APRS to the planet rescue?</span></p></div></div><p class="MsoNormal"> </p><div><div><div><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 href="https://mail.google.com/mail/u/0/#inbox/15b2521854ccaa63"><span style="color:#1f497d">[bad</span></a><span style="color:#1f497d"> link was here]</span></p></div><div><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></div><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 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></p></div><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><div><p class="MsoNormal"> </p></div><div><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></div><div><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></div><div><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></div><div><p class="MsoNormal" style="margin-bottom:12.0pt">Bob, wb4apr</p></div></div></div></body></html>