Line in KML

Draw a line <LineString>

<?xml version="1.0" encoding="UTF-8"?> 
<kml xmlns="http://earth.google.com/kml/2.0"> <Document>

<Placemark> 
 <LineString>
  <coordinates>
   135.2, 35.4, 0. 
   135.4, 35.6, 0.
   135.2, 35.6, 0.
  </coordinates>
 </LineString>
</Placemark>

</Document> </kml>

The first 2 lines and the last 1 line are the begining and the end of KML file, respectively. So please leave them as it is.
The tag of KML is case-sensitive.

"Altitude" is ignored without "<altitudeMode>" that is explained later.

Color the line<Style>, <LineStyle>

<?xml version="1.0" encoding="UTF-8"?> 
<kml xmlns="http://earth.google.com/kml/2.0"> <Document>

<Placemark> 
 <LineString>
  <coordinates>
   135.2, 35.4, 0. 
   135.4, 35.6, 0.
   135.2, 35.6, 0.
  </coordinates>
 </LineString>
 
 <Style> 
  <LineStyle>  
   <color>#ff0000ff</color>
  </LineStyle> 
 </Style>
</Placemark>

</Document> </kml>

The color can be specified in HEX (00-ff) in the order of Transparency, Blue, Green, and Red. For example, "ff0000ff" is opaque red.

As the example for "Point", "Style" can be defined and used the style id in "styleUrl".

Change the width of the line.<Style>, <LineStyle>

<?xml version="1.0" encoding="UTF-8"?> 
<kml xmlns="http://earth.google.com/kml/2.0"> <Document>

<Placemark> 
 <LineString>
  <coordinates>
   135.2, 35.4, 0. 
   135.4, 35.6, 0.
   135.2, 35.6, 0.
  </coordinates>
 </LineString>
 
 <Style> 
  <LineStyle>  
   <color>#ff0000ff</color>
   <width>5</width>
  </LineStyle> 
 </Style>
</Placemark>

</Document> </kml>

In some PC, the width of lines cannot be changed.

Draw a line at an altitude. <altitudeMode>

<?xml version="1.0" encoding="UTF-8"?> 
<kml xmlns="http://earth.google.com/kml/2.0"> <Document>

<Placemark> 
 <LineString>
  <coordinates>
   135.2, 35.4, 1000. 
   135.4, 35.6, 10000.
   135.2, 35.6, 5000.
  </coordinates>
  <altitudeMode>absolute</altitudeMode>
 </LineString>
 
 <Style> 
  <LineStyle>  
   <color>#ff0000ff</color>
   <width>5</width>
  </LineStyle> 
 </Style>
</Placemark>

</Document> </kml>

As the example "Point", altitude relative to the ground can be specified by "<altitudeMode>relativeToGround</altitudeMode>"

<name>, <TimeSpan>, <description>, <BalloonStyle> are same as "Point".

<?xml version="1.0" encoding="UTF-8"?> 
<kml xmlns="http://earth.google.com/kml/2.0"> <Document>

<Placemark> 
 <name> New Line</name> 
 <TimeSpan> 
  <begin>2010-12-20T03:00:00Z</begin>
  <end>2010-12-21T02:59:59Z</end>
 </TimeSpan>
 <description>This is a new line.</description>
 <LineString>
  <coordinates>
   135.2, 35.4, 1000. 
   135.4, 35.6, 10000.
   135.2, 35.6, 5000.
  </coordinates>
  <altitudeMode>absolute</altitudeMode>
 </LineString>
 
 <Style> 
  <LineStyle>  
   <color>#ff0000ff</color>
   <width>5</width>
  </LineStyle> 
  <BalloonStyle>
  <bgColor>00664422</bgColor> <textColor>fffffff</textColor>
  <text><![CDATA[ $[name] <HR> $[description] <BR>  
   <A HREF="http://www-step.kugi.kyoto-u.ac.jp/">SPEL Home page</A>
  ]]> </text>
 </BalloonStyle>
 </Style>
</Placemark>

</Document> </kml>

Time in Universal Time (UT) can be set by "YYYY-MM-DDTHH:MM:SSZ". Start and end time are set by " " and "”, respectively.