server url: http://tracker.dxpedition.net/

 

coverage of nextel at our LZ

 

This project does all that we need (is a client-side Java app that fires up Google Earth and tracks a callsign, but it seems a bit overkill): https://aprskml.dev.java.net/

 

Here's a server that serves up KML files given a callsign: http://www.openaprs.net/index.html

 

Need to setup the correct filter call but it exports KML files and provides historic tracking.

 

Generates a correct KML view given a call sign: http://www.aprsdepot.com/forum/index.php/topic,34.0.html

They can follow a call sign in real time already: http://www.aprsdepot.com/forum/index.php/topic,40.0.html

Another site that follows a call sign in realtime: http://db.aprsworld.net/datamart/track-search.php

 

TimL has updated ahab_location_google_earth.php to include blocks of the following code, which use the openaprs.net server to get APRS location data:

---

 

<NetworkLink>
 <Url>
  <refreshInterval>300</refreshInterval>
  <refreshMode>onInterval</refreshMode>
  <href><![CDATA[http://www.openaprs.net/ajax/google_earth/track.php?source=K7MCR&interval=&refresh=true]]></href>
 </Url>
 <visibility>1</visibility>
 <name>OpenAPRS:Some guy in Issaquah K7MCR</name>
</NetworkLink>
<NetworkLink>
 <Url>
   <refreshInterval>300</refreshInterval>
   <refreshMode>onInterval</refreshMode>
   <href><![CDATA[http://www.openaprs.net/ajax/google_earth/track.php?source=KE7GRE&interval=&refresh=true]]></href>
 </Url>
 <visibility>1</visibility>
 <name>OpenAPRS:Bre KE7GRE</name>
</NetworkLink>

 

---

 

 

---

 

We should create a system which reads APRS data from the internet somewhere, and then outputs KML (or ideally KMZ) files to feed users of google earth.

 

Someone created a demo of this here:

 

http://www.w7mjr.com:81/aprs/keyhole.shtml

 

http://www.aprs-is.net/javAPRSSrvr/serveradjunct.htm

 

http://mologogo.wikispaces.com/KML

 

This is an awesome demo, however, it has some issues..

 

• The dataset for the entire APRS network is large; the xml file is almost 2 megs.
• It looks like W7MJR is hosting this from a dsl line.
• His updates are every 2 minutes or so.
• It clearly can't support more than a few clients.

 

So we should re-create this demo using a subset of the entire APRS feed, with a whitelist of valid callsigns. Also, we can have it feed in stuff from mologogo phones.

 

Here's the XML file from the kml file:

 

---

 

 

com.w7mjr.aprs

APRS data received at station W7MJR

1

http://www.w7mjr.com:81/aprs/aprskeyhole.cfm/aprs.kml

120

0

 

---

It seems to have a pretty simple interface. This frontend kml file tells google earth to fetch new data from X url every 120 seconds.

 

the aprs.kml (snipped) uses this format:

 

---

Stations heard at W7MJR. Last update 24-Feb-07 18:22:48 UTC.

scription>

APRS - Boise, Idaho USA

1

 

147.04

 

testing

-112.2085

41.014503

30000

0

0.0

 

1

 

 

-112.2085,41.014503,

 

 

 

YV6EVC

>

 

testing

-64.463333

9.4316673

30000

0

0.0

 

1

 

 

-64.463333,9.4316673,