SRTM/TOPSAR高程數據比對

Comparison of DEM Acquired by SRTM and TOPSAR

賴子銘(Zi-Ming Lai) ； 史天元(Tian-Yuan Shih)

《航測及遙測學刊》 11卷4期 (2006/12) Pp. 447-459

https://doi.org/10.6574/JPRS.2006.11(4).8

摘要

本研究針對兩組合成孔徑干涉雷達(Interferometric Synthetic Aperture Radar, InSAR)所產製的數值高程模型(Digital Elevation Model, DEM)，分別為太空梭雷達製圖任務(Shuttle Radar Topographic Mission, SRTM)與空載地形合成孔徑雷達(Topographic Synthetic Aperture Radar, TOPSAR)，分析兩組高程數據的系統誤差、精度與粗差。
比對結果顯示在多山地區SRTM精度為9.5公尺，在平坦地區精度可達7.6公尺，均優於NASA公佈的精度規範。而TOPSAR在平坦地區精度為8.7公尺，在山區則包含大量粗差。若不經過粗差偵測和編修，無法達到NASA公佈的1~5公尺精度。經初步粗差移除後，平坦地區的精度為5.6公尺，山區則為12.4公尺。

關鍵字

干涉合成孔徑雷達 ； 數值高程模型

並列摘要

This study focused on the DEM comparison for two InSAR DEM data. One is the Shuffle Radar Topographic Mission (SRTM) 3 arc data, and the other is Topographic Synthetic Aperture Radar (TOPSAR) data. The DEM produced with airborne photogrammetry is used to validate the system bias, random error and blunders of those InSAR DEMs.
The accuracy of SRTM data is 9.5m in the mountainous area and 7.6m in the flat area, based on the evaluation conducted. It is better than the official specification. But the TOPSAR data that contained massive blunders was not as good as the system specification for either the flat or mountainous area. The results show that the unedited TOPSAR data is hard to achieve the nominal accuracy of 1~5m. After removing the blunders, the standard deviation of DEM difference is about 5.6m in the flat area and 12.4m in the mountainous area.

並列關鍵字

Interferometric Synthetic Aperture Radar ； InSAR ； Digital Elevation Model ； DEM