克拉科夫市精确局部拟类曲面模型的开发- QuasigeoidKR2019

IF 0.3 Q4 REMOTE SENSING Reports on Geodesy and Geoinformatics Pub Date : 2020-05-22 DOI:10.2478/rgg-2020-0004
Piotr Banasik, K. Bujakowski, J. Kudrys, M. Ligas
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引用次数: 5

摘要

大地水准面或拟大地水准面模型允许在有效的高程系统中将卫星测量与地面水准测量相结合。为克拉科夫市建立了一个精确的拟椭球模型。模型构建的目标之一是提供比国家模型PL-geoid2011提供的更详细的拟曲面过程。仅利用Kraków区域的4个测量点构建国家拟面曲面模型。可以认为,由于点的数量少且在城市区域内分布不均匀,准抛物面的确定精度较低。这成为基于大量均匀分布的点建立局部拟曲面模型的原因。拟椭球面模型基于研究区内66个均匀分布的点(间隔2.5 ~ 5.0 km)。拟椭球面模型的建模过程使用了在这些点确定的高度异常,这些高度异常是根据通过水准测量得出的正常高度和通过GNSS测量得出的椭球面高度确定的。来自全球位势模式EGM2008的高度异常在调查得出的高度异常中充当了长波趋势。分析表明,所建立的高度异常模型与经验数据拟合在单毫米水平上,平均绝对差值为0.005 m。开发的地方模型QuasigeoidKR2019与国家模型PL-geoid2011相似,是与波兰参考系统和高程系统密切相关的模型。这些模型用于整合GNSS和水准观测。以参考框架PL-ETRF2000和高程基准PL-KRON86-NH为基准,对当地拟igeoidkr2019和国家PL-geoid2011模型进行了比较。两种模式在GNSS/水准高度异常方面的比较显示,个别四分位数的值减少了三倍,而开发的局部模式的平均绝对差值则减少了三倍。这些汇总统计数据清楚地表明,克拉科夫市地方模型的准确性明显高于国家模型。
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Development of a precise local quasigeoid model for the city of Krakow – QuasigeoidKR2019
Abstract A geoid or quasigeoid model allows the integration of satellite measurements with ground levelling measurements in valid height systems. A precise quasigeoid model has been developed for the city of Krakow. One of the goals of the model construction was to provide a more detailed quasigeoid course than the one offered by the national model PL-geoid2011. Only four measurement points in the area of Kraków were used to build a national quasigeoid model. It can be assumed that due to the small number of points and their uneven distribution over the city area, the quasigeoid can be determined less accurately. It became the reason for developing a local quasigeoid model based on a larger number of evenly distributed points. The quasigeoid model was based on 66 evenly distributed points (from 2.5 km to 5.0 km apart) in the study area. The process of modelling the quasigeoid used height anomalies determined at these points on the basis of normal heights derived through levelling and ellipsoidal heights derived through GNSS surveys. Height anomalies coming from the global geopotential model EGM2008 served as a long-wavelength trend in those derived from surveys. Analyses showed that the developed height anomaly model fits the empirical data at the level of single millimetres – mean absolute difference 0.005 m. The developed local model QuasigeoidKR2019, similar to the national model PL-geoid2011, are models closely related to the reference and height systems in Poland. Such models are used to integrate GNSS and levelling observations. A comparison of the local QuasigeoidKR2019 and national PL-geoid2011 model was made for the reference frame PL-ETRF2000 and height datum PL-KRON86-NH. The comparison of the two models with respect to GNSS/levelling height anomalies shows a triple reduction in the values of individual quartiles and a mean absolute difference for the developed local model. These summary statistics clearly indicate that the accuracy of the local model for the city of Krakow is significantly higher than that of the national one.
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自引率
28.60%
发文量
5
审稿时长
12 weeks
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