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[aprssig] 3D positions in Google Earth?

Andrew Rich vk4tec at tech-software.net
Wed Dec 28 23:02:12 UTC 2005


Scott and others,

With google earth you have the ability to place a placemark.

One of the cool things you can do with that placemark is give it height.

In fact what I do is cheat, you the placemark with a line to the ground, put
"raise" the icon.

Now the only thing is, you can only specify the height above ground.

Not the actual baro determined pressure height.

Here is a sample of the data you send to google earth to make it happen.

I can work with you if you like to make some dynamic code.

If you look at the co-ordinats you will see this

<coordinates>153.103833,-27.574333,0</coordinates>

Thats a LAT / LON and yes a height ! (in this case 0)

You can get rid of the line from the object to the ground quite easily,
giving you 3D objects.

Sample XML presented to Google Earth.




 <?xml version="1.0" encoding="UTF-8" ?>
- <kml xmlns="http://earth.google.com/kml/2.0">
- <Placemark>
  <name>VK4TEC</name>
  <description>vk4tec at tech-software.net Andrew</description>
- <LookAt>
  <longitude>153.103833</longitude>
  <latitude>-27.574333</latitude>
  <range>365.2646606980322</range>
  <heading>0</heading>
  <tilt>20</tilt>
  </LookAt>
  <styleUrl>#khStyle615</styleUrl>
- <Style>
- <IconStyle>
  <scale>0.699999988079071</scale>
- <Icon>
  <href>root://icons/palette-3.png</href>
  <x>128</x>
  <y>32</y>
  <w>32</w>
  <h>32</h>
  </Icon>
  </IconStyle>
- <LineStyle>
  <width>5</width>
  </LineStyle>
  </Style>
- <Point>
  <extrude>1</extrude>
  <altitudeMode>relativeToGround</altitudeMode>
  <coordinates>153.103833,-27.574333,0</coordinates>
  </Point>
  </Placemark>
  </kml>

-----------------------------------------
Andrew Rich - VK4TEC
vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
www.tech-software.net
Brisbane AUSTRALIA



-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of scott at opentrac.org
Sent: Thursday, 29 December 2005 7:55 AM
To: 'TAPR APRS Mailing List'
Subject: [aprssig] 3D positions in Google Earth?


I'll admit I haven't been following all of the Google Earth / APRS
integration stuff very closely.  Does any solution out there handle plotting
positions in three dimensions?  What about with tracks?  I still don't like
Google's navigation interface as well as NASA WorldWind's, but it's OK and
no one seems to be working on APRS and WorldWind anymore.

For paraglider and hang glider events (and hot air balloons as well, I
suppose) it'd be great to have a mapping system that could show the
positions of stations with projected terrain.  And I'm afraid APRSDOS just
doesn't really cut it for eye candy anymore. =]

Scott
N1VG




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