I would have to agree that the annotation of the playground example does not explicitly state where the data is coming from, especially from the JS view. It is possible to work it out from the HTML view though.
Looking at the <header> of http://api.maps.nokia.com/en/playgro...ermarkers_desc , I see the line:
Code:
<base href="http://api.maps.nokia.com/en/playground/examples/maps/clustering/clustermarkers.html" />
, therefore the loadScript() function is loading data relative the base location i.e:
http://api.maps.nokia.com/en/playgro...ng/airports.js
which contains data of the form:
Code:
var data = [
{ latitude: -6.081689 , longitude: 145.391881 },
{ latitude: -5.207083 , longitude: 145.7887 },
{ latitude: -5.826789 , longitude: 144.295861 },
etc...
As you state, the information is displayed more clearly in the user guide at http://api.maps.nokia.com/en/maps/do...ker_Clustering