Google Maps技术揭秘
本文深入解析了Google Maps的技术实现方式，介绍了其使用了大量的JavaScript来创建交互体验，并利用Ajax技术进行异步网络请求以提升用户体验。此外，还详细说明了地图数据来源及背后的技术供应商。
Quoted from wikipedia:
Like other Google web applications, a large amount of JavaScript was used to create Google Maps. As the user drags the map, the grid squares are downloaded from the server and displayed to the user. When a user searches for a business, the location is pin-pointed with a red pin, which is actually a transparent PNG placed over the map. The technique of providing greater user-interactivity by performing asynchronous network requests with Javascript and XML has recently become known as Ajax. Specifically, Google Maps was built using the AjaXSLT framework.
[color=green]The GIS (map) data used in Google Maps are provided by Tele Atlas and NAVTEQ, while the small patches of high-resolution satellite imagery are largely provided by DigitalGlobe and its QuickBird satellite, with some imagery also from government sources. The main global imagery base called NaturalVue was derived from Landsat 7 imagery by MDA Federal (formerly Earth Satellite Corporation). This global image base provide the essential foundation for the entire application.[/color]
[color=blue]The underlying technology used in both Google and Yahoo! maps is available from deCarta (formerly Telcontar)[2].[/color]
Amazing!
Like other Google web applications, a large amount of JavaScript was used to create Google Maps. As the user drags the map, the grid squares are downloaded from the server and displayed to the user. When a user searches for a business, the location is pin-pointed with a red pin, which is actually a transparent PNG placed over the map. The technique of providing greater user-interactivity by performing asynchronous network requests with Javascript and XML has recently become known as Ajax. Specifically, Google Maps was built using the AjaXSLT framework.
[color=green]The GIS (map) data used in Google Maps are provided by Tele Atlas and NAVTEQ, while the small patches of high-resolution satellite imagery are largely provided by DigitalGlobe and its QuickBird satellite, with some imagery also from government sources. The main global imagery base called NaturalVue was derived from Landsat 7 imagery by MDA Federal (formerly Earth Satellite Corporation). This global image base provide the essential foundation for the entire application.[/color]
[color=blue]The underlying technology used in both Google and Yahoo! maps is available from deCarta (formerly Telcontar)[2].[/color]
Amazing!
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