KML format

The KML files represent overlays of the user positions suitable for use in Google Earth. KML is described in the official specification.

There are KML files for both the server (trial-i_server.kml), which contain traces as measured by the server (including all 5 devices), and for each individual device (trial-i-k_phone-j.kml). For the "free walking" condition, there are no server logs, and so no server KML files (there are individual device KML files).

Each KML file consists of a series of placemark elements. Each placemark has a name (of the form "Phone-j", where j is the device number), and one or more coordinates. Each coordinate is in latitude, longitude format.

The server KML files consist of a series of interleaved placemarks (one for each device), while the individual device KML files contain a single placemark with a stream of coordinates representing the participant's path. The server KML files have a timespan for each placemark so that the times at which the device was at a particular postion can be derived.

Example

<name>Phone-3</name>
<styleUrl>#UW0CZK2zyPNB</styleUrl>
<description>abc</description>
<TimeSpan>
<begin>2009-07-30T00:00:00Z</begin>
<end>2009-07-30T00:00:00Z</end>
</TimeSpan>
<Point>
<coordinates>-3.978272111807,51.610819521786</coordinates>
</Point>
</Placemark>

<Placemark>
<name>Phone-3</name>
<styleUrl>#UW0CZK2zyPNB</styleUrl>
<description>abc</description>
<TimeSpan>
<begin>2009-07-30T00:00:00Z</begin>
<end>2009-07-30T00:00:00Z</end>
</TimeSpan>
<Point>
<coordinates>-3.978272111807,51.610819521786</coordinates>
</Point>
</Placemark>