fgdata/Materials/regions/sierras.xml

<?xml version="1.0"?>
<PropertyList>
  <name>Sierras</name>
  <area>
    <lon1>-116.0</lon1>
    <lat1>32.0</lat1>
    <lon2>-104.0</lon2>
    <lat2>42</lat2>
  </area>

  <condition>
   <equals>
    <property>sim/startup/season</property>
    <value>summer</value>
   </equals>
  </condition>

  <material include="Materials/base/runway_effect.xml">
  <name>pa_shoulder</name>
    <texture>Runway/pa_shoulder2.png</texture>
    <parameters>
     <uvstretch>8.0</uvstretch>
    </parameters>
  </material>

  <material include="Materials/base/runway_effect.xml">
  <name>pa_shoulder_f</name>
    <texture>Runway/pa_shoulder_f2.png</texture>
    <parameters>
     <uvstretch>8.0</uvstretch>
    </parameters>
  </material>

  <material>
    <name>EvergreenBroadCover</name>
    <name>EvergreenForest</name>
    <effect>Effects/forest</effect>
	<texture-set>
    <texture>Terrain/forest1a.png</texture>
	<texture n="12">Terrain/rock_red.png</texture>
	<texture n="13">Terrain/rock_red.png</texture>
	</texture-set>
	<parameters>
	  <rock_strata>1</rock_strata>
	</parameters>
    <xsize>2000</xsize>
    <ysize>2000</ysize>
    <light-coverage>10000000.0</light-coverage>
    <wood-coverage>4000.0</wood-coverage>
    <tree-texture>Trees/coniferous-alt.png</tree-texture>
    <tree-varieties>8</tree-varieties>
    <tree-height-m>25.0</tree-height-m>
    <tree-width-m>18.0</tree-width-m>
    <rolling-friction>1</rolling-friction>
    <bumpiness>1</bumpiness>
  </material>

</PropertyList>