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Methodology for local correction of the heights of global geoid models to improve the accuracy of GNSS leveling
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作者 Stepan Savchuk Alina Fedorchuk 《Geodesy and Geodynamics》 EI CSCD 2024年第1期42-49,共8页
At present,one of the methods used to determine the height of points on the Earth’s surface is Global Navigation Satellite System(GNSS)leveling.It is possible to determine the orthometric or normal height by this met... At present,one of the methods used to determine the height of points on the Earth’s surface is Global Navigation Satellite System(GNSS)leveling.It is possible to determine the orthometric or normal height by this method only if there is a geoid or quasi-geoid height model available.This paper proposes the methodology for local correction of the heights of high-order global geoid models such as EGM08,EIGEN-6C4,GECO,and XGM2019e_2159.This methodology was tested in different areas of the research field,covering various relief forms.The dependence of the change in corrected height accuracy on the input data was analyzed,and the correction was also conducted for model heights in three tidal systems:"tide free","mean tide",and"zero tide".The results show that the heights of EIGEN-6C4 model can be corrected with an accuracy of up to 1 cm for flat and foothill terrains with the dimensionality of 1°×1°,2°×2°,and 3°×3°.The EGM08 model presents an almost identical result.The EIGEN-6C4 model is best suited for mountainous relief and provides an accuracy of 1.5 cm on the 1°×1°area.The height correction accuracy of GECO and XGM2019e_2159 models is slightly poor,which has fuzziness in terms of numerical fluctuation. 展开更多
关键词 GNSS leveling Global geoid model Gravity anomaly Weight data Correcting data
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Establishment of a Geometric Geoid Model and Evaluation of the EGM2008 and EIGEN-6CA Models over the Dakar-Thies-Mbour Triangle in Senegal
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作者 Diogoye Diouf Moustapha Gning Tine +1 位作者 Sokhna Mou Mapeinda Gueye Serigne Saliou Fall 《International Journal of Geosciences》 CAS 2024年第11期927-939,共13页
High-accuracy geoid determination is an essential goal that many groups of scientists and countries are striving to achieve. Techniques for determining geoid models have evolved over time. Unfortunately, this all-impo... High-accuracy geoid determination is an essential goal that many groups of scientists and countries are striving to achieve. Techniques for determining geoid models have evolved over time. Unfortunately, this all-important determination requires relatively substantial technical and financial resources, depending on the type of geoid to be determined. This situation justifies the inadequacy, and sometimes absence, of accurate geoid models in many countries, despite the new challenges of altimetric positioning using space or satellite positioning techniques. This study focuses on the establishment of a geometric geoid model using simplistic techniques that are accessible and applicable in restricted or wide areas, with or without gravimetric data. The study was applied to the Dakar-Thiès-Mbour triangle, the two regions in the extreme west of Senegal that are home to the most infrastructure projects with the highest socio-economic stakes, as well as mines currently being exploited, and therefore the highest stakes in terms of positioning. This study also enabled us to assess the accuracy of a number of global field models in Senegal, which are used by some professionals for altimetric positioning using Global Positioning Satellite Systems (GNSS) in the absence of a local geoid model. The estimated geoid model is based on the determination of undulation at various sample points in the study area. To this end, a campaign of GNSS observations and direct levelling was carried out on the various points spread across the study area. These measurements were then used to determine the undulation at each point. Bilinear interpolation was used to deduce the undulations throughout the study area, based on the altimeter conversion grid. This grid was evaluated using GPS/level control points. 展开更多
关键词 model geoid Geometric Levelling GNSS UNDULATION EGM2008 EIGEN-6CA
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Computing Local Geoid Model Using DTM and GPS Geodetic Points.Case Study:Mejez El Bab-Tunisia
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作者 Noamen Rebai Olfa Zenned +1 位作者 Hichem Trabelsi Hammadi Achour 《International Journal of Geosciences》 2018年第3期161-178,共18页
Different methods have been deployed to compute the geoid, the altimetry reference for surveying applications. One of their main goals is to allow the use of GPS (Global Positioning System) or GNSS heights, which are ... Different methods have been deployed to compute the geoid, the altimetry reference for surveying applications. One of their main goals is to allow the use of GPS (Global Positioning System) or GNSS heights, which are related to an ellipsoid and therefore must be corrected. Some of these methods are accurate but quite heavy as developed by [1], but one of them is easy to use while giving very good results in a local system: some mm for a 10 × 10 km2 area developed by [2] [3]. In our study, we have used software called “Géoide Program”, previously used at the CERN in Switzerland and set up by [4], which they complete this software allowing a parameterization of general data to provide results in a general system. Then, tests have shown the way to optimize computations without any loss of accuracy. For our computations we use gridded of geodetic heights, from Lambert or WGS 84 datum’s, DTM (Digital Terrain Model) and leveled GPS points. To obtain these results, components of the vertical deflection are computed for every point on the grid, deduced from the attraction exerted by the mass Model. Then, geodetic heights are computed by an incremental way from an arbitrary reference. Once the calculation is performed, the geodetic height of any point located in the modelled area can be interpolated. The variations of parameters (mainly size and increments of the DTM and of the modeled area, and ground density) have shown that they do not play a significant role although DTM must be large enough to take into account an important area around a selected zone. However, the choice of the levelled GPS points is primordial. We have performed tests with real data concerning Mejez El Bab zone, in north of Tunisia. Nevertheless, for a few hundreds of square kilometers area, and just by using a DTM and a few levelled GPS points, this method provides results that look extremely promising, at least for surveying activities, as it shows a good possibility to use GPS for coarse precision levelling, and as DTM are now widely available in many countries. 展开更多
关键词 geoid model geoide Soft” GPS Digital Terrain model HEIGHT Vertical Deflection Mejez El Bab-Tunisia
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Influencing factors on the accuracy of local geoid model
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作者 Shazad Jamal Jalal Tajul Ariffin Musa +3 位作者 Ami Hassan Md Din Wan Anom Wan Aris WenBin Shen Muhammad Faiz Pa’suya 《Geodesy and Geodynamics》 2019年第6期439-445,共7页
Different modification methods and software programs were developed to obtain accurate local geoid models in the past two decades.The quantitative effect of the main factors on the accuracy of local geoid modeling is ... Different modification methods and software programs were developed to obtain accurate local geoid models in the past two decades.The quantitative effect of the main factors on the accuracy of local geoid modeling is still ambiguous and has not been clearly diagnosed yet.This study presents efforts to find the most influential factors on the accuracy of the local geoid model,as well as the amount of each factor’s effect quantitatively.The methodology covers extracting the quantitative characteristics of 16 articles regarding local geoid models of different countries.The Statistical Package of Social Sciences(SPSS)software formulated a strong multiple regression model of correlation coefficient r = 0.999 with a high significance coefficient of determination R^2 = 0.997 and adjusted R^2 = 0,98 for the required effective factors.Then,factor analysis is utilized to extract the dominant factors which include:accuracy of gravity data(40%),the density of gravity data(25%)(total gravity factors is 65%),the Digital Elevation Model(DEM)resolution(16%),the accuracy of GPS/leveling points(10%)and the area of the terrain of the country/state under the study(9%).These results of this study will assist in developing more accurate local geoid models. 展开更多
关键词 ACCURACY of LOCAL geoid model MULTIPLE regression model Influence FACTORS
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Modelling Orthometric Heights from a Combination of Ellipsoidal Heights and Gravimetric Geoid Model in Rivers State, Nigeria
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作者 Kurotamuno P. Jackson Elochukwu C. Moka 《International Journal of Geosciences》 2020年第4期184-196,共13页
Many applications in geodesy, hydrography and engineering require geoid-related heights. Spirit leveling which is the traditional means of obtaining geoid- or mean sea level-related heights is slow, time-consuming and... Many applications in geodesy, hydrography and engineering require geoid-related heights. Spirit leveling which is the traditional means of obtaining geoid- or mean sea level-related heights is slow, time-consuming and costly. Global Navigation Satellite Systems (GNSS) offer faster and relatively cheaper way of obtaining geoid-related heights when geoidal undulation is applied to ellipsoidal heights. However, difficulties involved in determining acceptable geoid height have seriously hampered the application of GNSS for leveling in Rivers State, thus necessitating the need to develop an acceptable geoid model which will serve as a means of conversion of GNSS-delivered ellipsoidal heights to their orthometric heights equivalent. In pursuance of this objective, a detailed gravimetric geoid has been evaluated for Rivers State, Nigeria. The computation of the geoid was carried out by the traditional remove-restore procedure. The Earth Geopotential Model 2008 (EGM08) was applied as the reference field for both the remove and restore parts of the procedures;spherical Fast Fourier Transform (FFT) was employed for the evaluation of the Molodenskii’s integral formula for the height anomaly, (ζ) to yield the quasi-geoid;while the Residual Terrain Modelling (RTM) was done by prism integration. The classical gravimetric geoid over Rivers State was obtained from the rigorously evaluated quasi-geoid by adding the quasi-geoid to geoid (N?- ζ) correction it. The minimum and maximum geoid height values are 18.599 m and 20.114 m respectively with standard deviation of 0.345 m across the study area. Comparison of the gravimetric geoidal heights with the GPS/Leveling-derived geoidal heights of 13 stations across Rivers State, Nigeria showed that the absolute agreement with respect to the GPS/leveling datum is generally better than 7 cm root mean squares (r.m.s) error. Results also showed that combining both GPS heights and the computed Rivers State geoid model can give orthometric heights accurate to 3 cm post-fit using a 4-parameter empirical model. The geoid model can thus serve as a good alternative to traditional leveling when used with GPS leveling, particularly for third order leveling in the study area. 展开更多
关键词 geoid modelLING Remove-Compute-Restore Fast Fourier Transform Residual Terrain model Ellipsoidal HEIGHTS Orthometric HEIGHTS
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Application of Geoid Anomalies to the Tectonic Research in the East Asian Continental Margin
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作者 WU Xiaoyang XING Junhui +4 位作者 LI Chaoyang LIU Xinzhe YANG Kai CHEN Hongyan GONG Wei 《Journal of Ocean University of China》 SCIE CAS CSCD 2018年第4期811-822,共12页
In this paper, we calculated multi-scale residual geoid anomalies with the method of geoid separation processing, according to EGM2008 ultra-high order gravity field model, remove-restore technique and Stokes integral... In this paper, we calculated multi-scale residual geoid anomalies with the method of geoid separation processing, according to EGM2008 ultra-high order gravity field model, remove-restore technique and Stokes integral. The East Asian continental margin was selected as the study area. The residual geoid anomalies have been calculated by programming. On the basis of residual geoid anomalies at various orders, the interlayer geoid anomalies at different depths were calculated to depict the spatial distribution characteristics of the residual geoid. Finally, we conducted a detailed geophysical interpretation for the study area according to the geoid anomalies in combination with other geophysical datasets. Four conclusions can be outlined as follows: 1) it is impracticable that geoid anomalies are used in the interpretation of the shallow objects due to the influence of the terrain; 2) the anomalies of residual geoid can reflect the intensity of small-scale mantle convection in the asthenosphere; 3) the interlayer geoid anomalies can reflect the magmatic activities associated with the mantle convection and mantle plume in different scales; 4) the study of the geoid may provide an approach for the research of the subduction zone, mantle convection and mantle plume. 展开更多
关键词 EGM2008 gravity field model geoid ANOMALIES the East ASIAN CONTINENTAL margin structural INTERPRETATIONS
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Determination of Antarctic geoid by using global gravity field
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作者 陈春明 李建成 《Chinese Journal of Polar Science》 2000年第1期1-8,共8页
With Chinese latest global gravity field model WDM94, the authors provide the geoid height and mean free air gravity anomaly of Antarctica (The range of latitude is from -60° to -90°). In order to conclude a... With Chinese latest global gravity field model WDM94, the authors provide the geoid height and mean free air gravity anomaly of Antarctica (The range of latitude is from -60° to -90°). In order to conclude and analyze the characters of Antarctic geoid roundly, the authors collect the latest oversea global gravity field model OSU91 (to degree and order 360) and JGMOSU (to degree and order 360), get the corresponding geoid height and mean free air gravity anomaly. The results are compared with the results got from WDM94, thus we get the difference. The standard deviation of geoid height between WDM94 and OSU91 is ±1.90 m;the deviation of geoid between WDM94 and JGMOSU is ±2.09 m. The standard deviation of mean gravity anomaly are ±8.97 mGal and ±9.32 mGal respectively. [WT9.HZ] 展开更多
关键词 ANTARCTICA geoid gravity anomaly gravity field model.
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湖南省似大地水准面模型对比研究
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作者 喻艳梅 尹羿晖 《科技创新与应用》 2024年第26期109-112,共4页
正常高系统是以似大地水准面为基准的高程系统,也是中国目前采用的高程系统。随着GNSS定位技术的广泛应用,已能在10-7~10-9的精度量级上获得测量点的平面位置,但是却一直未能以相应的精度求解点的高程值。因此,通过建立高精度、高分辨... 正常高系统是以似大地水准面为基准的高程系统,也是中国目前采用的高程系统。随着GNSS定位技术的广泛应用,已能在10-7~10-9的精度量级上获得测量点的平面位置,但是却一直未能以相应的精度求解点的高程值。因此,通过建立高精度、高分辨率的区域似大地水准面模型提升高程测量的精度,成为重要的技术手段。该文通过对湖南省2007似大地水准面模型后期各似大地水准面模型的对比研究,找到模型的差异,并对差异较大的地区进行特征分析,查找形成差异的原因,可为全省二、三等水准网测量和大地水准面再精化工作提供参考。 展开更多
关键词 大地水准面 高程异常 似大地水准面模型 等值线图 模型对比
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EGM2008模型计算重力扰动位及相关量的方法研究
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作者 沈映政 王友昆 余章蓉 《测绘与空间地理信息》 2024年第3期25-28,共4页
地球重力场模型EGM2008提供了计算全球高分辨率和高精度重力场相关参量的可能。本文采用球谐综合的方法,对重力扰动位、重力异常、大地水准面高等物理量的计算步骤和方法进行了研究和分析,并编制了相应的计算程序基于EGM2008无潮模型和... 地球重力场模型EGM2008提供了计算全球高分辨率和高精度重力场相关参量的可能。本文采用球谐综合的方法,对重力扰动位、重力异常、大地水准面高等物理量的计算步骤和方法进行了研究和分析,并编制了相应的计算程序基于EGM2008无潮模型和零潮模型对以上参量进行了计算,同NGA发布的计算程序计算的结果进行了比对,验证了计算的方法正确性和可靠性。 展开更多
关键词 EGM2008 重力场模型 大地水准面 重力异常
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径向基函数拟合重力大地水准面与GNSS/水准偏差的研究
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作者 杨蔚然 刘焕玲 +2 位作者 文汉江 敖敏思 杨熙 《导航定位学报》 CSCD 北大核心 2024年第6期118-127,共10页
针对重力似大地水准面与实测全球导航卫星系统(global navigation satellite system,GNSS)/水准确定的几何似大地水准面存在偏差的问题,尝试利用球面径向基函数基于重力似大地水准面高程异常和实测GNSS/水准高程异常的差异建立校正模型... 针对重力似大地水准面与实测全球导航卫星系统(global navigation satellite system,GNSS)/水准确定的几何似大地水准面存在偏差的问题,尝试利用球面径向基函数基于重力似大地水准面高程异常和实测GNSS/水准高程异常的差异建立校正模型,以提高区域似大地水准面的精度,试验结果表明:球面径向基函数可以将重力似大地水准面有效校正至几何似大地水准面,校正后GNSS/水准检核点高程异常的差异由7.58 cm减小至4 cm以内;点质量函数、二阶径向多极函数、泊松核函数和二阶泊松小波基函数的校正效果差异在1 mm以内,可忽略不计;相比多项式方法拟合法,球面径向基函数校正方法精度更高,高程异常的精度由3.9 cm提高至3.2 cm以内。 展开更多
关键词 球面径向基函数 重力场模型 似大地水准面 拟合模型 高程异常
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GNSS观测值类型对短基线大地高差精度的影响分析
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作者 王恒毅 谭荣杰 +1 位作者 杨瀚融 陈华 《全球定位系统》 CSCD 2024年第1期89-93,共5页
基于某市C级网的观测数据,分析了采用不同原始观测值和无电离层组合等四种不同基线解算策略对短基线大地高差精度的影响,结果发现,仅通过基线较差分析难以评估不同解算策略的基线处理精度.为此,联合二等水准测量和似大地水准面模型对基... 基于某市C级网的观测数据,分析了采用不同原始观测值和无电离层组合等四种不同基线解算策略对短基线大地高差精度的影响,结果发现,仅通过基线较差分析难以评估不同解算策略的基线处理精度.为此,联合二等水准测量和似大地水准面模型对基线结果进行了外部检核,发现采用无电离层组合的结果中大地高差存在约2.2 cm的系统差,而使用原始双频观测值的结果精度最高,是短基线处理的最佳策略. 展开更多
关键词 GNSS 短基线 大地高 似大地水准面模型
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特大型跨海桥梁工程似大地水准面精化实践与分析
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作者 何广源 李剑坤 《测绘标准化》 2024年第1期151-155,共5页
特大型跨海桥梁工程似大地水准面精化应用实践极少。为解决风浪大、长距离等复杂海况下海上施工的高精度定位和放样等难题,本文对某特大型跨海桥梁工程进行高精度似大地水准面精化,基于地形、重力数据等基础数据和先进的理论模型,采用... 特大型跨海桥梁工程似大地水准面精化应用实践极少。为解决风浪大、长距离等复杂海况下海上施工的高精度定位和放样等难题,本文对某特大型跨海桥梁工程进行高精度似大地水准面精化,基于地形、重力数据等基础数据和先进的理论模型,采用应用广泛的第二类Helmert聚集法计算得到似大地水准面模型。经实践验证,该似大地水准面模型精度达±0.008 m,应用实测平均精度为±0.0118 m,成果满足设计精度要求;同时,通过将格网模型植入该桥梁建设所建立的工程用连续运行基准站(CORS)系统内,方便大桥日常建设中采用网络实时动态定位(RTK)实现高精度的施工放样,提高工作效率,为大桥顺利建设提供重要的基础技术支持和保障。 展开更多
关键词 跨海大桥 全球导航卫星系统 似大地水准面精化 模型精度
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陆海交界处基于重力场模型解算的大地水准面精度分析--以山东省为例
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作者 张连伟 孙毅 +2 位作者 金波文 马永 丁德秋 《海洋信息技术与应用》 2024年第2期65-71,共7页
大地水准面作为高程基准和深度基准相互转换的中间基准面,其精度对基准转换效果至关重要。以山东省为例,本文分别使用目前较优的三种超高阶重力场模型EGM2008、EIGEN-6C4和SSG-UGM-2解算陆海交接处的大地水准面,分析其在山东省内的分布... 大地水准面作为高程基准和深度基准相互转换的中间基准面,其精度对基准转换效果至关重要。以山东省为例,本文分别使用目前较优的三种超高阶重力场模型EGM2008、EIGEN-6C4和SSG-UGM-2解算陆海交接处的大地水准面,分析其在山东省内的分布特征。利用收集到的GNSS水准点数据对三种重力场模型解算结果进行精度分析。研究发现,基于EIGEN-6C4模型的解算结果是三种模型中最符合实际情况的,同时使用85高程基准面重力位解算结果精度更高。 展开更多
关键词 陆海交界 重力场模型 大地水准面 精度分析
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新昌县现代测绘基准服务能力测试与评估
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作者 汪泽南 冯杨民 王路 《北京测绘》 2024年第4期644-648,共5页
为客观评估新昌县现代测绘基准服务支撑保障能力,对新昌县及周边卫星导航定位基准站、全球卫星导航系统(GNSS)D级网、三等水准网,以及县域的高精度似大地水准面模型相关的基础数据进行统计、分析与处理,结果表明新昌县卫星导航定位基准... 为客观评估新昌县现代测绘基准服务支撑保障能力,对新昌县及周边卫星导航定位基准站、全球卫星导航系统(GNSS)D级网、三等水准网,以及县域的高精度似大地水准面模型相关的基础数据进行统计、分析与处理,结果表明新昌县卫星导航定位基准站网覆盖全面、站网观测质量良好、实时差分定位(RTK)服务水平精度优于±1.0 cm,大地高精度优于±2.5 cm,似大地水准面模型精度优于2.0 cm,能够支撑新昌县经济社会发展,长远来看仍需做好新昌县测绘基准的维持与更新工作。 展开更多
关键词 基准站 全球卫星导航系统 水准网 似大地水准面模型
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基于格网模型的高程异常插值系统研究
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作者 李守英 马林 +1 位作者 盛志勇 孙漳林 《长春工程学院学报(自然科学版)》 2024年第2期64-67,共4页
研究基于格网模型的高程异常插值系统使用的格网模型结构、格网插值使用的算法、插值系统的界面和功能,并以我国香港地区的似大地水准面插值为例,说明文件插值高程转换的过程。
关键词 高程异常 似大地水准面 格网模型 格网插值
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似大地水准面高程异常拟合方法分析研究
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作者 张丹丹 《测绘与空间地理信息》 2024年第11期190-193,共4页
通过对似大地水准面拟合方法及必要性进行分析研究,单一拟合模型普遍具有一定的局限性,难以满足地形复杂区域拟合精度要求。针对该弊端,本文以某地区高程控制测量项目为研究对象,利用GNSS水准联测数据分别构建多项式拟合模型、多面函数... 通过对似大地水准面拟合方法及必要性进行分析研究,单一拟合模型普遍具有一定的局限性,难以满足地形复杂区域拟合精度要求。针对该弊端,本文以某地区高程控制测量项目为研究对象,利用GNSS水准联测数据分别构建多项式拟合模型、多面函数拟合模型,然后通过最优加权平均算法对单一拟合模型拟合成果进行组合处理,形成最优加权平均模型,对研究区似大地水准面进行拟合,通过对3种模型的内外符合精度、检核点误差及误差分布情况进行对比分析,验证了最优加权平均模型相较于单一模型能够更为准确地对区域似大地水准面进行拟合精化,整体拟合效果大大提升,同时最优加权平均模型适用性较高,可操作性较强,能够实现不同地形条件区域似大地水准面的精确获取。 展开更多
关键词 似大地水准面 高程异常 拟合模型 最优加权平均模型
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利用GPS精化区域似大地水准面 被引量:33
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作者 张正禄 邓勇 +1 位作者 罗长林 宋玉兵 《大地测量与地球动力学》 CSCD 北大核心 2006年第4期14-17,共4页
基于原有似大地水准面,在区域设计一些具有高精度的GPS大地高和水准高的公共点,采用数学拟合方法可得该区域似大地水准面的精化模型。由精化后的似大地水准面可得到区域内任一GPS测点的水准高程,从而代替五等水准测量和三角高程测量。
关键词 GPS大地高 水准高程 似大地水准面 精化模型 高程异常
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全国及部分省市地区高精度、高分辨率大地水准面的研究及其实施 被引量:33
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作者 陈俊勇 李建成 +1 位作者 宁津生 晁定波 《武汉大学学报(信息科学版)》 EI CSCD 北大核心 2006年第4期283-288,共6页
结合我国重力和地形资料及国内外较优的重力场模型,研制了适合我国重力场特征的360阶重力场模型WDM94,建立了中国新一代包括全部陆海国土的dm级(似)大地水准面CQG2000,建立了中国以GPS/水准为基础的高程异常控制网,利用海洋卫星测高数... 结合我国重力和地形资料及国内外较优的重力场模型,研制了适合我国重力场特征的360阶重力场模型WDM94,建立了中国新一代包括全部陆海国土的dm级(似)大地水准面CQG2000,建立了中国以GPS/水准为基础的高程异常控制网,利用海洋卫星测高数据进行我国海洋大地水准面的计算、我国陆地重力(似)大地水准面的研制及我国陆海(似)大地水准面的拼接;研制了江苏省、海南省、深圳市、大连市、南京市及南水北调西线工程具有cm级精度的省市地区(似)大地水准面模型;结合GPS技术和高精度(似)大地水准面模型,研制了GPS测图软硬件一体化系统。 展开更多
关键词 (似)大地水准面 重力场模型 GPS/水准 CQG2000
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CQG2000模型在青藏高原地区的精度检验及其对区域重力调查工作的意义 被引量:3
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作者 耿涛 刘宽厚 +2 位作者 邸志众 李钢 杨怀英 《西北地质》 CAS CSCD 2010年第2期1-7,共7页
区域重力调查中,测点正常高的精度直接影响重力测量成果的精度。利用CQG2000似大地水准面模型对GPS测得的大地高程进行改算,可得到较高精度的正常高成果。然而,CQG2000似大地水准面模型在不同地区的精度和分辨率是不同的,在青藏高原地... 区域重力调查中,测点正常高的精度直接影响重力测量成果的精度。利用CQG2000似大地水准面模型对GPS测得的大地高程进行改算,可得到较高精度的正常高成果。然而,CQG2000似大地水准面模型在不同地区的精度和分辨率是不同的,在青藏高原地区精度相对差些。通过对CQG2000似大地水准面模型在青藏高原地区精度的实地检验,证实其在该地区的精度可以满足1:20万区域重力调查工作中求取测点正常高的精度需要。通过上述实验,总结出用CQG2000模型提高区域重力调查中GPS高程测量精度的方法,对区域重力调查工作有重要意义。 展开更多
关键词 似大地水准面模型 青藏高原 GPS测量 精度 检验
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利用EGM2008位模型计算中国高程基准与大地水准面间的垂直偏差 被引量:31
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作者 翟振和 魏子卿 +1 位作者 吴富梅 任红飞 《大地测量与地球动力学》 CSCD 北大核心 2011年第4期116-118,共3页
高程基准面相对于大地水准面的垂直偏差是区域高程基准转换和全球高程基准统一的基础数据。利用最新发布的EGM2008地球重力场模型和中国均匀分布的936个GPS水准点数据计算得出中国青岛大港验潮站的重力位为62 636 852.85±0.07 m2/... 高程基准面相对于大地水准面的垂直偏差是区域高程基准转换和全球高程基准统一的基础数据。利用最新发布的EGM2008地球重力场模型和中国均匀分布的936个GPS水准点数据计算得出中国青岛大港验潮站的重力位为62 636 852.85±0.07 m2/s2,进而得到中国1985高程基准相对大地水准面的垂直偏差为0.32m。 展开更多
关键词 EGM2008位模型 大地水准面 高程基准 重力位 基准偏差
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