radial element

This is an extremely handy drawing element which you can use to draw complicated ILS extended centerlines.

Attribute	Format	Remarks
Root Element	map
Element	radial
trk	float	inbound track value (0-360)
rad	float	outbound radial value (0-360)
mag	boolean	“True” or “False” to indicate whether the trk/rad values above are magnetic. Default is “False” if not supplied. IVAC2 will apply magnetic variation adjustment to bearings unless mag=“True”.
len	float	length of radial to draw (in nautical miles)
offset	float	offset distance in nm - start radial line from point this point
stroke_pattern	double array	line pattern described in an array of doubles
stroke_width	float	line width
stroke_color	string	color id name

The <radial> element can contain one or more <marker> sub elements:

Attribute	Format	Remarks
Root Element	radial
Element	marker
int	float	interval value at which to draw this marker
offset_cw	float	length in nautical miles of the marker to draw on the clock wise side
offset_ccw	float	length in nautical miles of the marker to draw on the counter clock wise side
skip	integer	skip x markers before starting to draw first marker
number	integer	draw only x number of markers
stroke_pattern	double array	line pattern described in an array of doubles
stroke_width	float	line width
stroke_color	string	color id name

Each radial requires 1 <point> element which corresponds to the start of the radial. The <marker> elements are optional.

You should generally use TRUE bearings - magnetic variation is calculated by IVAC2. If you need to specify a magnetic bearing then ensure you set mag="true".

example

  <!-- ILS EBOS RWY 26 -->
  <radial trk="259" len="20" stroke_color="ILS">
      <point lat="N0511147872" lon="E0025109331"/>
      <marker int="1"  offset_cw="0.5" offset_ccw="0.5"/>
      <marker int="5"  offset_cw="1.0" offset_ccw="1.0"/>
      <marker int="10" offset_cw="1.0" offset_ccw="1.0"/>
  </radial>
  <!-- ILS EBOS RWY 08 -->
  <radial trk="079" len="10" stroke_color="ILS">
      <point lat="N0511211970" lon="E0025349610"/>
      <marker int="1" offset_cw="0.5" offset_ccw="0"/>
      <marker int="5" offset_cw="1.0" offset_ccw="0"/>			
  </radial>

example using offset, skip and number attributes …

Smart usage of the <radial> element combined with several <marker> elements can result in complex radial drawings such as runway extension lines with different markers depending on the distance from the threshold:

  <!-- runway extension line, dashed, 25 NM long -->
  <radial rad="079" len="25" stroke_width="1" offset="10" pattern="2,2" stroke_color="ils">
 
      <!-- starting point -->
      <point lat="N0511211970" lon="E0025349610"/>
 
      <!-- draw 2 markers every 5 NM, skip first 3, counterclockwise 0.5 NM long, clockwise 0.5 NM long -->
      <marker int="5" offset_ccw="0.5" offset_cw="0.5" skip="3" number="2"/>
 
  </radial>

  <!-- rwy extension line, 10 NM long, drawn on top of the first 10 NM of the previous dashed line -->
  <radial rad="079" len="10" stroke_width="1" offset="1" stroke_color="ils">
 
      <!-- starting point = equal to the starting point of the previous dashed line -->
      <point lat="N0511211970" lon="E0025349610"/>
 
      <!-- draw a marker every NM but skip first 2, only clockwise 0.25 NM long -->
      <marker int="1" offset_ccw="0" offset_cw="0.25" skip="2"/>
 
      <!--  draw a marker every 2 NM but skip the first one, clockwise 0.5 NM long -->
      <marker int="2" offset_ccw="0" offset_cw="0.5" skip="1"/>
 
      <!-- draw a marker every 5 NM but skip the first one, clockwise and counterclockwise 0.5 NM long -->
      <marker int="5" offset_ccw="0.5" offset_cw="0.5" skip="1"/>
 
  </radial>

The radial line starts with an offset of 1nm from the runway threshold, the first two 1nm markers are skipped, and the first 2nm and 5nm markers are also skipped.

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