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SRTM/TopSAR高程數據比對與多尺度分析

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圖 2-2-1:SRTM 裝置圖[Rabus et al, 2003]  SRTM 使用 InSAR 技術由兩張涵蓋相同地區的 SAR 影像利用同一目標物的 雷達回訊係數做干涉處理,可由相位差計算地物高程。大部分衛載系統需要通過 目標上空兩次觀測以上來獲取兩個 SAR 影像進行干涉,屬於重複通過干涉 (repeat-pass interferometry)。由於兩次取像時間不同,大氣狀況與濕度也不相同, 常造成 SAR 像對的相關性降低,無法產生干涉圖像。SRTM 同時使用兩組成像 雷達觀測同時取得 SAR
圖 2-2-2:SRTM 掃瞄次帶寬組成示意圖[Rabus et al, 2003]  §2-2-1 SRTM 資料格式與特性  SRTM 資料以洲作為基礎進行處理,再經幾種預處理步驟如編輯、粗差移 除、決定水面高程與定義海岸線。再依地理座標進行切割,將成果裁切成 15000 個圖幅檔案存放,每一圖幅涵蓋範圍為一經度乘一緯度。每個圖幅是由範圍內所 有資料獲取(data take)平均而得,圖幅名稱是由圖幅西南角的經緯度來命名, SRTM 數據的取樣間距為 1 弧秒或 3 弧秒,視 SRTM-1 或 SRTM
圖 2-2-7:臺灣 SRTM  資料黑白暈渲圖 (黑色部分代表高程值為 0 或資料空缺。)
表 2-3-3:TopSAR 資料格式[JPL, 2003]  DEM 數據(C 波段,L 波段不一定)
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