#!/usr/bin/awk -f



function abs(i) {
  if (i > 0) {
    return i;
  } else {
    return i * (-1.0);
  }
}


function header(name) {
  print "  <kml xmlns=\"http://earth.google.com/kml/2.0\">" > name;
  print "  <Placemark>" > name;
  print "    <name>" name "</name>" > name;
  print "    <Style>" > name;
  print "      <LineStyle id=\"khLineStyle989\">" > name;
  print "      <color>7f0000ff</color>" > name;
  print "      <width>2</width></LineStyle>" > name;
  print "    </Style>" > name;
  print "    <LineString>" > name;
  print "      <tessellate>1</tessellate>" > name;
  print "      <coordinates>" > name;
}

function footter(name) {
  print "      </coordinates>" > name;
  print "    </LineString>" > name;
  print "  </Placemark>" > name;
  print "</kml>" > name;
}


{
  date=$1
  time=$2
  lon=$3
  lat=$4
  if ((lon != 0) && (lat != 0)) {
    if ((abs(lon - llon) > 0.006736) ||
	(abs(lat - llat) > 0.004532)) {
      if (name) {
	footter(name);
      }
      name=date "-" time ".kml";
      header(name);
    }

    print lon ", " lat ", 04" > name;
    llat = lat;
    llon = lon;
  }
}
END {
  footter(name);
}