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四川大地震 同步比較地震前後影像 (Sichuan earthquake)

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Uploaded by on Jun 11, 2008

This is a visualization result to show the difference of the terrain before and after Sichuan earthquake. We use the satellite images and DTM data to create a 3D model for real-time, interactive navigation. Only the image difference is available, because we don't have the DTM data after the quake. Images were acquired at 2006 and 2008.

我們使用國家太空中心提供的二組四川衛星影像,分別攝於2006及2008年,來比較四川大地震前後的影像差異。原始資料除了影像資料外,還有從NASA下載的SRTM資­料(地震前),可惜缺少地震後的地形資料,故無法比較地形的變化。經過色彩融合及座標校正,得到高解析度的2m解析度彩色影像及40m解析度的地形資料。我們將遙測影像結­合地形資料,透過VIML的3D VR Engine所開發的terrain程式,建立出一個可即時互動的3D場景,在其中飛行,觀察影像的差異,發現地震所造成的影響,例如走山現象及堰塞湖的形成。

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