对巴西最近联合全球地势模式的评价

IF 0.9 Q4 REMOTE SENSING
E. Nicacio, R. Dalazoana, S. Freitas
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引用次数: 4

摘要

摘要本文的目的是对目前主要的全球组合地势模型(GGMs)在巴西各地法向大地水准面高度建模中的充分性进行定量分析。自2016年中期以来,在综合GGMs的阐述和开发方面取得了重大进展,本分析的主要目的是验证最近的模型是否比以前性能最好的模型表现出更好或同等的性能。根据不同的大地水准面高程和高程异常位势函数,在不同的发育程度下,将gnss /水准解决方案得到的正大地水准面高程值与GGMs XGM2016、GOCO05C、EIGEN-6C4和EGM2008计算的正大地水准面高程值进行对比分析,采用相对法。这一程序应用于巴西全国997个载有椭球高度和正交高度资料的台站。研究结果表明,GOCO05C和XGM2016组合ggm的性能优于EIGEN-6C4和EGM2008,均达到了近年组合ggm的最大开发度720度;当所有模型都在各自的最大程度上使用时,结果近似相等。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of recent combined global geopotential models in Brazil
Abstract The aim of this paper is to present a quantitative analysis of the adequacy of the main currently existing combined Global Geopotential Models (GGMs) for modeling normal-geoid heights throughout Brazil. As major advances have been reached since mid-2016 in the combined GGMs elaboration and development, the main objective of this analysis is to verify if, in fact, the most recent models present superior or equivalent performance to the most performant previous models. The analysis was based on comparisons between normal-geoid height values obtained fromGNSS/leveling solutions and values calculated from GGMs XGM2016, GOCO05C, EIGEN-6C4 and EGM2008, according to different geopotential functionals - geoid height and height anomaly - and in different degrees of development, always through the relative method. This procedure was applied to 997 stations which carry information of both ellipsoidal and normal-orthometric heights, located all over Brazil. As a main result, it was observed the superior performance of the recent combined GGMs, GOCO05C and XGM2016, when compared to the older models, EIGEN-6C4 and EGM2008, when all of them are developed up to degree 720, the maximum degree of the recent models; and a approximate equality of results when all of the models are used in their individual maximum degrees.
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来源期刊
Journal of Geodetic Science
Journal of Geodetic Science REMOTE SENSING-
CiteScore
1.90
自引率
7.70%
发文量
3
审稿时长
14 weeks
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