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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >A Method to Estimate Long-Wave Height Errors of SRTM C-Band DEM
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A Method to Estimate Long-Wave Height Errors of SRTM C-Band DEM

机译：SRTM C波段DEM长波高度误差的估算方法

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摘要

The digital elevation model (DEM) of the Shuttle Radar Topography Mission (SRTM) still has known long-wave height errors. These errors occur especially in the continent's interior with a spatial scale of hundreds to thousands of kilometers and a magnitude of several meters. In this letter, for the first time, a method for estimating those long-wave height errors with the intention to improve the absolute height accuracy of SRTM C-band DEM globally is presented. The improvement of the SRTM DEM bases on continuously defined spherical harmonics which are able to model the whole sphere. The highly accurate measurements of the Geoscience Laser Altimeter System instrument aboard the Ice, Cloud, and land Elevation Satellite (ICESat) serve as input for the least-squares adjustment which estimates the relevant coefficients of the spherical harmonics. Selection criteria are applied to these data to get ICESat points on flat and nonvegetated areas which account for the most “reliable” points with an accuracy of approximately 1 m. Our results provide a height improvement of 5–6 m along Eurasia and up to ±4 m along North America. The validation with worldwide Global Positioning System tracks proves that the absolute height accuracy of SRTM could generally be improved to better than 3 m.
机译：航天飞机雷达地形任务（SRTM）的数字高程模型（DEM）仍具有已知的长波高度误差。这些错误尤其发生在非洲大陆内部，其空间尺度为数百到数千公里，大小为几米。在这封信中，首次提出了一种用于估计那些长波高度误差的方法，目的是全面提高SRTM C波段DEM的绝对高度精度。 SRTM DEM的改进基于能够定义整个球体的连续定义的球谐函数。冰，云和陆地高程卫星（ICESat）上的Geoscience激光测高仪系统仪器的高精度测量值用作最小二乘平差的输入，该估计用于估计球谐函数的相关系数。将选择标准应用于这些数据，以在平坦和非植被区域获得ICESat点，这些点占“最可靠”点的精确度约为1 m。我们的结果使欧亚大陆的高度提高了5–6 m，而北美地区的高度提高了±4 m。全球范围内全球定位系统轨道的验证证明，SRTM的绝对高度精度通常可以提高到3 m以上。

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