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首页> 外文期刊>Journal of Geodesy >Combining EGM2008 and SRTM/DTM2006.0 residual terrain model data to improve quasigeoid computations in mountainous areas devoid of gravity data
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Combining EGM2008 and SRTM/DTM2006.0 residual terrain model data to improve quasigeoid computations in mountainous areas devoid of gravity data

机译：结合EGM2008和SRTM / DTM2006.0残余地形模型数据，以改进在缺乏重力数据的山区中的准类群计算

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摘要

A global geopotential model, like EGM2008, is not capable of representing the high-frequency components of Earth's gravity field. This is known as the omission error. In mountainous terrain, omission errors in EGM2008, even when expanded to degree 2,190, may reach amplitudes of 10cm and more for height anomalies. The present paper proposes the utilisation of high-resolution residual terrain model (RTM) data for computing estimates of the omission error in rugged terrain. RTM elevations may be constructed as the difference between the SRTM (Shuttle Radar Topography Mission) elevation model and the DTM2006.0 spherical harmonic topographic expansion. Numerical tests, carried out in the German Alps with a precise gravimetric quasigeoid model (GCG05) and GPS/levelling data as references, demonstrate that RTM-based omission error estimates improve EGM2008 height anomaly differences by 10cm in many cases. The comparisons of EGM2008-only height anomalies and the GCG05 model showed 3.7 cm standard deviation after a bias-fit. Applying RTM omission error estimates to EGM2008 reduces the standard deviation to 1.9 cm which equates to a significant improvement rate of 47%. Using GPS/levelling data strongly corroborates these findings with an improvement rate of 49%. The proposed RTM approach may be of practical value to improvernquasigeoid determination in mountainous areas without sufficient regional gravity data coverage, e.g., in parts of Asia, South America or Africa. As a further application, RTM omission error estimates will allow refined validation of global gravity field models like EGM2008 from GPS/ levelling data.
机译：像EGM2008这样的全球地势模型无法表示地球重力场的高频分量。这称为遗漏错误。在山区，EGM2008中的遗漏错误，即使扩展到2190度，对于高度异常的幅度可能会达到10cm甚至更大。本文提出了利用高分辨率残差地形模型（RTM）数据来计算崎terrain地形中遗漏误差的估算值。 RTM高程可以构造为SRTM（航天飞机雷达地形任务）高程模型与DTM2006.0球形谐波地形扩展之间的差异。在德国阿尔卑斯山进行的数值测试以精确的准拟准地物模型（GCG05）和GPS /水准仪数据为参考，表明基于RTM的遗漏误差估算在许多情况下将EGM2008高度异常差提高了10cm。仅EGM2008高度异常与GCG05模型的比较显示，在偏拟合后，标准偏差为3.7 cm。将RTM遗漏误差估算值应用于EGM2008，可将标准偏差减小到1.9 cm，这意味着显着提高了47％。使用GPS /水准仪数据强烈证实了这些发现，改进率为49％。拟议的RTM方法对于在没有足够的区域重力数据覆盖的山区（例如在亚洲，南美或非洲的部分地区）改善类古地理的确定可能具有实用价值。作为进一步的应用，RTM遗漏误差估计值将允许根据GPS /水准仪数据对EGM2008等全球重力场模型进行精细验证。

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