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fgdata/Environment/layer-speed-change.xml

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<?xml version="1.0" ?>
<!--
This file is part of FlightGear, the free flight simulator
http://www.flightgear.org/
Copyright (C) 2009 Torsten Dreyer, Torsten (at) t3r _dot_ de
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
-->
<PropertyList>
<name>MetarController:layer:wind-speed-kt</name>
<type>gain</type>
<gain>1.0</gain>
<enable>
<condition>
<property>/environment/metar/valid</property>
</condition>
</enable>
<input>
<expression>
<product>
<property>/environment/config/boundary/entry[0]/wind-speed-kt</property>
<sum>
<property>/environment/config/boundary/entry[1]/wind-speed-change-rel</property>
<value>1.0</value>
</sum>
</product>
</expression>
</input>
<output>/environment/config/boundary/entry[1]/wind-speed-kt</output>
</PropertyList>