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I found that there actually is a method for querying by Index in the layerObj $layerObj->queryByIndex(???, $fid) where ??? is probably the tileIndex of a layer object. Maybe I missed it in the documentation, but I am pretty sure that it is not there. I only found a int queryByIndex(....) in the mapObj section, but none in the layerObj section of the ...

You might want to look into FME Server (Safe Software) as well. It can upload, process, tranform, reproject, and download in to pretty much any common format. It also has some very cool functions such as email/sms notifications and on demand feature streaming. Good luck!

I would suggest looking into several options: Google Fusion Tables. Great way to import spreadsheet data with coordinates (or addresses), and display on a map. Exporting to KML I believe is an option. MapBox. Lots of big data implementations currently in the wild. http://mapbox.com/showcase/#bigdata ArcGIS Explorer Online (ESRI). From a big commercial ...