Adding a script to generate a kml from the adsb state server. Also a kml file to periodically refresh the kml based on a network link.

apps/adsb.kml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://earth.google.com/kml/2.2">
+  <Folder>
+    <name>Network Links</name>
+    <visibility>1</visibility>
+    <open>0</open>
+    <description>Network link example</description>
+    <NetworkLink>
+      <name>Planes</name>
+      <visibility>1</visibility>
+      <open>0</open>
+      <description>Moar Planes</description>
+      <refreshVisibility>1</refreshVisibility>
+      <flyToView>0</flyToView>
+      <Link>
+      	<href><![CDATA[http://localhost:8080]]></href>
+        <refreshMode>onInterval</refreshMode>
+        <refreshInterval>0.4</refreshInterval>
+      </Link>
+    </NetworkLink>
+    </Folder>
+</kml>

apps/adsb_to_kml.py

@@ -0,0 +1,127 @@
+#!/usr/bin/env python
+
+from twisted.internet.protocol import Protocol, ReconnectingClientFactory
+from twisted.internet import reactor, task
+import struct
+
+from datetime import datetime
+import calendar
+import time
+
+class Echo(Protocol):
+    def __init__(self):
+        self.buf = ""
+        self.targets = {}
+        self.timeout = task.LoopingCall(self.cull)
+        self.timeout.start(30)
+
+    def dataReceived(self, data):
+        self.buf += data
+        self.process()
+
+    def process(self):
+        while len(self.buf) >= 40:
+            (icao, _type, ts, lat, lon, alt) = struct.unpack("!IIdddd", self.buf[:40])
+            self.buf = self.buf[40:]
+
+            if _type != 0x1:
+                continue
+
+            self.targets[icao] = (ts, lat, lon, alt)
+
+    def get_targets(self):
+        return self.targets
+
+    def cull(self):
+        """
+        Periodically this should be called to dump targets which haven't been
+        heard from in a while.
+        """
+        delete_icaos = []
+        for icao, met in self.targets.iteritems():
+            print met[0]
+            #if (calendar.timegm(datetime.utcnow().utctimetuple()) - met[0]) > 120:
+            if (time.time() - met[0]) > 120:
+                delete_icaos.append(icao)
+
+        for i in delete_icaos:
+            print "deleting", i
+            del self.targets[i]
+
+
+class EchoClientFactory(ReconnectingClientFactory):
+    def __init__(self):
+        self.connected = False
+
+    def startedConnecting(self, connector):
+        print 'Started to connect.'
+
+    def buildProtocol(self, addr):
+        print 'Connected.'
+        self.connected = True
+        self.client = Echo()
+        return self.client
+
+    def is_connected(self):
+        return self.connected
+
+    def get_client(self):
+        return self.client
+
+    def clientConnectionLost(self, connector, reason):
+        self.connected = False
+        print 'Lost connection.  Reason:', reason
+        self.retry(connector)
+
+    def clientConnectionFailed(self, connector, reason):
+        self.connected = False
+        print 'Connection failed. Reason:', reason
+        self.retry(connector)
+
+from twisted.web import server, resource
+from lxml import etree
+from pykml.factory import KML_ElementMaker as KML
+
+class Simple(resource.Resource):
+
+    def __init__(self, _factory):
+        self.factory = _factory
+
+    isLeaf = True
+    def render_GET(self, request):
+        if not self.factory.is_connected():
+            return
+
+        request.responseHeaders.setRawHeaders("content-type", ['application/vnd.google-earth.kml+xml'])
+
+        doc = KML.kml()
+        folder = KML.Folder(KML.name("planes"))
+        doc.append(folder)
+        targ = self.factory.get_client().get_targets()
+        for icao, met in targ.iteritems():
+            folder.append(
+                KML.Placemark(
+                    KML.name('%x' % icao),
+                    #KML.styleUrl("#pushpin"),
+                    KML.Point(
+                        KML.extrude(True),
+                        KML.altitudeMode('relativeToGround'),
+                        KML.coordinates('%f,%f,%f' % (met[2], met[1], met[3])),
+                    ),
+                ),
+            )
+        return etree.tostring(etree.ElementTree(doc),pretty_print=True)
+
+
+
+if __name__ == "__main__":
+    host = "localhost"
+    port = 1234
+    factory = EchoClientFactory()
+    reactor.connectTCP(host, port, factory)
+
+    site = server.Site(Simple(factory))
+    reactor.listenTCP(8080, site)
+
+    reactor.run()
+