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首页> 外文期刊>Journal of applied geodesy >North American height datums and their offsets: The effect of GOCE omission errors and systematic levelling effects
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North American height datums and their offsets: The effect of GOCE omission errors and systematic levelling effects

机译：北美高度基准及其偏移：GOCE遗漏误差的影响和系统的水准测量效果

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摘要

One of the main scientific objectives of the Gravity field and steady state Ocean Circulation Explorer (GOCE) gravity field satellite mission is its contribution to the global unification of height systems. In this study, we compute the offsets of three height datums in North America (NAVD88, CGVD28 and Nov07) against a common equipotential surface. NAVD88 and CGVD28 are the official vertical datums for the USA and Canada, respectively. Nov07 is the latest unofficial adjustment of the first-order levelling network in Canada. This datum is only used for the validation of geoid models. The offset for each datum is determined from a combination of ellipsoidal, orthome-tric and geoid heights. The ellipsoidal heights on benchmarks come from the GNSS networks of Canada and the USA while geoid heights are computed from currently the best GOCE-based geopotential model in North America, i.e., go_cons_gcf_2_tim_r3. The orthometric heights of the GNSS stations are available from the adjustments of the vertical control networks of both countries. Among the various factors that contribute to the uncertainty of the computed datum offset, we investigate the effect of the omission error of the GOCE geoid by means of the EGM2008 model. In Canada, where GNSS/levelling stations are irregularly distributed over the landmass, the effect of the GOCE omission error on the computed offsets reaches one decimetre. Due to the much more densely distributed GNSS/levelling stations in the USA, the effect of the GOCE omission error on the offset of NAVD88 is 3 cm. Therefore, the effect of the omission error of GOCE-based geopotential models should be taken into account in the height datum unification on the North American continent if we aim at the one centimetre accuracy.
机译：重力场和稳态海洋环流探测器（GOCE）重力场卫星任务的主要科学目标之一是其对高度系统的全球统一的贡献。在这项研究中，我们计算了北美三个高度基准（NAVD88，CGVD28和Nov07）相对于一个共同的等势面的偏移量。 NAVD88和CGVD28分别是美国和加拿大的官方垂直基准。 Nov07是加拿大一阶调平网络的最新非官方调整。该数据仅用于大地水准面模型的验证。每个数据的偏移量是根据椭球体高度，高程高度和大地水准面高度的组合确定的。基准上的椭球高来自加拿大和美国的GNSS网络，而大地水准面的高度是根据目前北美最佳的基于GOCE的地势模型计算得出的，即go_cons_gcf_2_tim_r3。可以通过两国垂直控制网络的调整获得GNSS站的正高。在导致计算基准偏移量不确定性的各种因素中，我们通过EGM2008模型研究了GOCE大地水准面遗漏误差的影响。在加拿大，GNSS /水准站不规则地分布在陆地上，GOCE遗漏误差对计算出的偏移量的影响达到了1分米。由于美国的GNSS /水准仪站分布更密集，因此GOCE漏失误差对NAVD88的偏移的影响为3 cm。因此，如果我们的目标是一厘米的精度，则在北美大陆的高度基准统一中应考虑基于GOCE的地势模型的遗漏误差的影响。

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