2Crockford, D. The application/json Media Type for JavaScript Object Notation (JSON) [EB/OL].[2009-03].http://tools.ieff.org/html/rfc4627.
3Howard Butler, M. D., Allan Doyle, Sean Gillies, Tim Schaub, Christopher Schmidt. The GeoJSON Format Specification [EB/OL]. [2009-03].http://www.geojson. org/geojson-spec.html.
4Masinter, L. The "data" URL scheme: [EB/OL].2009.http://tools.ieff.org/html/rfc 2397.
5Wikipedia. data URI scheme: [EB/OL] [2009-05].http://en.wikipedia.org/wiki/Data:_URL.
6Delgado, E. Drawing performance:[EB/OL] [2008-08].http://www.ernestdelgado. com/gmaps/canvas/ddemo 1 .html.
