Andrew,
Not sure if you found a solution, if not, this is what I've done.
In the map init function, set a timer:
window.setInterval(raingaugeRefreshData, 600000, rainGauges);
Then in the timer service function:
function raingaugeRefreshData(layer)
{
layer.loaded = false;
layer.setVisibility(true);
}
By setting loaded to false then calling setVisibility(), openlayers goes and
grabs the kml file again.
Hope this helps.
Dan
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