基于CGCS2000新框架的地物坐标更新策略研究与分析

doi:10.13474/j.cnki.11-2246.2024.0310

摘要/Abstract

摘要： 本文针对未来CGCS2000框架更新后,由此衍生的全国各类实体坐标成果的更新策略和方法进行分析研究,为未来CGCS2000 框架维持在GPS布点、数据处理方法及达到的精度方面提供思路和应对策略。采用地形及面积与我国大致相同,且可以公开下载的国外密集的CORS站数据,设计、处理形成了研究所需的不同时长的GPS观测数据集及厘米级、分米级CGCS2000坐标数据仿真集。分别讨论了天文大地网CGCS2000坐标从分米级至厘米级的提升,以及基于CORS的CGCS2000新框架衍生的实体坐标转换的实施方法和策略。对转换到新框架下影响坐标转换精度的因素:格网内插方法、控制点密度、搜索范围、格网间距等进行充分试验分析,确定了:①天文大地点CGCS2000精度从分米级到厘米级提升的最大控制点间距为2.2°,相应为230km,即全国需要布363个点;但顾及地方框架的自身维护,各省(市)至少有4个站,则全国需在2178个天文大地点进行GPS观测。②要实现新的CGCS2000框架下实体坐标间隔10年的动态更新,若布设985个CORS站,在我国东部和中部控制点间距分别为482km、西部地区为107km时可达到5cm的精度;而全国布置2170个CORS站,对应我国东部、中部、西部地区控制点密度分别为118、374、75km时可达到3cm的精度。因试验区为地理近似而非完全一致,本文所得结论和实际会有差异,仅为我国框架衍生的各类实体坐标成果更新机制提供参考和借鉴。

关键词: CGCS2000, 坐标产品动态更新, 天文大地网精度提升, 最佳分布密度

Abstract: This paper analyzes and studies the update strategies and methods of the nation-wide entity coordinate results after the new CGCS2000 frame update, and provides ideas and countermeasures for the future CGCS2000 frame maintenance on aspects of the GPS station layout, data dealing methods and product accuracy possible achieved. In this paper, the data of dense CORS station abroad, which is roughly the same in terrain and area as China, can be downloaded publicly, is used to design and process the GPS observation data set with different time length and the required cm-level and decimeter-level CGCS2000 coordinate data set for this study. The improvement of CGCS2000 coordinates of astronomical geodetic network from decimeter level to centimeter level and the implementation of dynamic updating of CGCS2000 mapping products based on CORS update framework are discussed respectively. The factors that affect the accuracy realization: grid interpolation method, control point density, search range, grid spacing, etc, are fully analyzed by experiments, and it is determined that the maximum control point spacing for improving the precision of CGCS2000 coordinates for astro-geodetic points, is 2.2°, corresponding to 230km, which requires 363 points nationwide. In order to facilitate the maintenance of the regional framework and at least 4 stations guaranteed in each province (city), GPS observations need to be carried out at 2178 astronomical sites nationwide. In order to realize the dynamic update of CGCS2000 mapping products at an interval of 10 years, when 985 CORS stations are deployed, the accuracy of 5cm can be achieved when the control point spacing in the eastern, central and western regions of China is 482, 482 and 107km respectively. 2170 CORS stations are needed to deployed nationwide, which can reach the accuracy of 3cm when the density of control points in the eastern, central and western regions of China reaches 118, 374 and 75km respectively. Because the test area is geographically approximate rather than completely consistent, the conclusions obtained will differ from the reality, and only provide reference for the update mechanism of surveying and mapping products in China.

Key words: CGCS2000, coordinate product dynamic update, improve the accuracy of astro-geodetic network, optimum distribution density

中图分类号:

P228

成英燕, 常春涛, 王虎, 徐彦田, 许长辉. 基于CGCS2000新框架的地物坐标更新策略研究与分析[J]. 测绘通报, 2024, 0(3): 54-62.

CHENG Yingyan, CHANG Chuntao, WANG Hu, XU Yantian, XU Changhui. Research and analysis on land feature coordinate update strategy based on CGCS2000 new framework[J]. Bulletin of Surveying and Mapping, 2024, 0(3): 54-62.

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