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added spikes section to usersguide. clean up meta docs to prep for 2.6

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Matthew Wall
2014-01-28 13:19:28 +00:00
parent 6bc3c759d9
commit db5aca7ead
4 changed files with 32 additions and 27 deletions
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docs/usersguide.htm
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@@ -2856,6 +2856,38 @@ Jan 18 20:39:14 raspberrypi weewx[5977]: **** Expected to read 99 chars;
</p>
<p>The cure is simple: kill all but one of them.</p>
<h3 id='spikes'>Spikes in the graphs</h3>
<p>Occasionally you may see anomalous readings, typically manifested as
spikes in the graphs. The source could be a flaky serial/USB connection,
radio or other interference, a cheap USB-Serial adapter, low-quality
sensors, or simply an anomalous reading. It is not unusual for low-end
hardware to report odd sensor readings occasionally (once every few
days). Some sensors, such as solar radiation/UV, have a limited lifespan
of about 5 years. If you frequently see anomalous data, first check
the hardware.</p>
<p>To keep bad data from the database, add a quality control (QC) rule
such as Min/Max bounds. See the <a href="#StdQC">QC</a> section for
details.</p>
<p>To remove bad data from the database, you will have to do some basic
SQL commands. For example, let's say the station emitted some very
high temperatures and wind speeds for one or two readings. This is
how to remove them:</p>
<ol>
<li>stop <span class='code'>weewx</span></li>
<li>Make a copy of the archive database</li>
<p class='tty'>cp $SQLITE_ROOT/weewx.sdb $SQLITE_ROOT/weewx-YYMMDD.sdb</p>
<li>Verify the bad data exist where you think they exist</li>
<p class='tty'>sqlite3 $SQLITE_ROOT/weewx.sdb
sqlite> select dateTime,outTemp from archive where outTemp > 1000;</p>
<li>See whether the bad temperature and wind data happened at the same time</li>
<p class='tty'>sqlite> select dateTime,outTemp,windSpeed from archive where outTemp > 1000;</p>
<li>Remove the bad data by setting to NULL</li>
<p class='tty'>sqlite> update archive set windSpeed=NULL where outTemp > 1000;
sqlite> update archive set outTemp=NULL where outTemp > 1000;</p>
<li>Delete the statistics database so that <span class='code'>weewx</span> can regenerate it without the anomalies</li>
<li>start <span class='code'>weewx</span></li>
</ol>
<h3>FreeBSD</h3>
<p>User Fabian reports that the following had to be done to get the
VantagePro2 working under FreeBSD:</p>