排序方式： 共有80条查询结果，搜索用时 15 毫秒
31.
结合实际生产项目,开展了坐标转换研究,基于．NET平台实现了坐标转换的基本功能。同时,实现了不同坐标系统的七参数转换,并在实际生产项目中得到验证,具有一定的应用价值。 相似文献
32.
海上石油水文勘探调查涉及海浪、海流等多种水文要素,S4 ADW浪潮仪作为为数不多的能同时测量海浪、海流要素的设备,在浅海观测中灵活度高,应用广泛,采用坐底式观测,不易受海上恶劣环境的破坏,能够持续得到石油水文勘探调查所需要的海浪、海流的同步观测数据.但是在实际操作和后期数据处理过程中该仪器尚存在一些自身问题,限制了该仪器的观测能力.本研究就S4仪器自身及其波浪处理软件方面所存在的典型问题进行了讨论,并提供了一套实用的解决方案,填补了该仪器使用经验方面的空白,可供国内外S4用户参考. 相似文献
33.
34.
我国陆地垂线偏差精化计算 总被引：1，自引：1，他引：1
我国天文大地网与高精度GPS2000网进行联合平差时,为满足地面观测数据归算到WGS84椭球的需要,采用移去-恢复技术和高阶次地球重力位模型,应用全国重力资料和30″×30″数字地形模型,完成了参加联合平差的48 919个大地点的相应于WGS84椭球垂线偏差的精化计算,并用115个与天文点重合的GPS点的实测垂线偏差对计算结果进行了外部检验,得到全国垂线偏差子午分量的总体精度为±1.45″,卯酉分量的总体精度为±1.50″。 相似文献
35.
BJ-54坐标系与WGS-84坐标系转换方法及精度分析 总被引：2，自引：0，他引：2
根据大连市C级GPS网中重合1954北京坐标系下的25个三角点成果,采用三、七参数转换模型,完成了我国54坐标系与世界84坐标系转换参数的计算与精度分析。 相似文献
36.
Hasanuddin Z. Abidin S. Sutisna T. Padmasari K. J. Villanueva J. Kahar 《Marine Geodesy》2005,28(4):291-304
Indonesia has maritime boundaries with 10 countries namely: Australia, Timor Leste, Papua New Guinea (PNG), Palau, Philippines, Vietnam, Thailand, Malaysia, Singapore, and India. Many treaties have been ratified concerning these boundaries. Unfortunately, many coordinates of boundary points mentioned in the treaties are not clear in relation to their geodetic datum. The uncertainty in geodetic datum of boundary points introduces complications and problems in spatial management of Indonesia's maritime boundaries, since it can displace the boundary lines from their assumed true location. This study investigates the possible original geodetic datums for the maritime boundaries between Indonesia and neighboring countries, in the case they are not explicitly stated in the treaties. The displacements of boundaries in WGS84 datum are generally in the order of a few hundred meters, i.e., about 200 to 400 m, depending on the assumed original geodetic datum being considered. These boundary displacements are spatially advantageous for Indonesia in some cases and also disadvantageous in others. The study will sum up with some conclusions and recommendations. 相似文献
37.
将WGS-84坐标转为北京54坐标的一种实用方法 总被引：1，自引：0，他引：1
在野外地质工作中,空间信息的采集离不开GPS(Global Positioning System),对其数据结果的利用,需要进行坐标转换。这里详细讨论了将WGS-84坐标转换为北京54坐标的转换原理。在讨论了空间坐标转换模型和平面坐标转换模型的基础上,给出了一种简洁适用的坐标转换方法,并通过实例验证了这种转换方法的可行性。 相似文献
38.
松辽盆地朝84-6井区在白垩系泉头组四段沉积时期位于盆地西南通榆-保康水系和南部长春-怀德水系的交汇处,交汇水系内沉积物来源、古水流走向等仍属未知。通过对岩心、分析化验资料和区域砂体厚度预测结果的综合研究,根据重矿物组合特征、ZTR指数变化特征和地层砂体展布规律,发现研究区的沉积特征具明显物源分带性,将其划分为保康物源体系主控I区、怀德物源体系主控III区和双物源体系混合控制II区。结合研究区沉积相模式研究成果,对比分析各分区的碎屑岩组分、砂岩厚度、岩石粒度和泥岩颜色等沉积特征的相似性和差异性,验证了物源体系主控区域划分的合理性。 相似文献
39.
Hasanuddin Z. Abidin S. Sutisna T. Padmasari K. J. Villanueva J. Kahar 《Marine Geodesy》2013,36(4):291-304
Indonesia has maritime boundaries with 10 countries namely: Australia, Timor Leste, Papua New Guinea (PNG), Palau, Philippines, Vietnam, Thailand, Malaysia, Singapore, and India. Many treaties have been ratified concerning these boundaries. Unfortunately, many coordinates of boundary points mentioned in the treaties are not clear in relation to their geodetic datum. The uncertainty in geodetic datum of boundary points introduces complications and problems in spatial management of Indonesia's maritime boundaries, since it can displace the boundary lines from their assumed true location. This study investigates the possible original geodetic datums for the maritime boundaries between Indonesia and neighboring countries, in the case they are not explicitly stated in the treaties. The displacements of boundaries in WGS84 datum are generally in the order of a few hundred meters, i.e., about 200 to 400 m, depending on the assumed original geodetic datum being considered. These boundary displacements are spatially advantageous for Indonesia in some cases and also disadvantageous in others. The study will sum up with some conclusions and recommendations. 相似文献
40.
The geoid undulation on GRS80 in the Taiwan area at half‐degree grid points has been calculated using the reduced 30’ × 30’ block mean gravity anomalies and the OSU91A geopotential coefficient set up to degree and order 360. The OSU91A results have been used to compare with WGS84, CEM10C, and OSU86F geoid undulations determined in 18 first‐order triangulation stations of the Taiwan Geodetic Datum 1980 (TGD80). Comparisons have also been made between these free‐air anomalies determined from OSU91A, and terrestrial gravity anomalies. It has been found that the average difference between the OSU91A model‐derived, and 243 actual point free‐air anomalies is 16.8 ± 48.0 mgal. It has also been found that more reliable and dense terrestrial gravity data are needed, both for terrestrial observations and for the OSU91A model, to achieve the very high‐precision geoid on GRS80 in the area of study. 相似文献