共查询到17条相似文献，搜索用时 375 毫秒
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利用GPS测定地方坐标系转换的四参数法 总被引：1，自引：0，他引：1
全球定位系统(GPS)卫星星历是以WGS84大地坐标系为根据而建立的,我们平时使用的是经过WGS84坐标系统转化的1954北京坐标,在实际工程测量中我们又经常用到地方独立坐标系,因此有必要求出1954北京坐标系与地方坐标系之间参数。本文介绍的就是我们在实际工作中求解该参数的方法。 相似文献
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坐标系统的统一是1个地区地理信息资源共享和标准统一的基础,目前,很多地区采用多个测量坐标系统,为实现测量坐标系统的统一,需要对不同坐标系的地理信息成果进行坐标转换。本文结合青岛市实际,对青岛市已有地理信息由原来采用的"青岛市城市坐标系"向国家统一的"1980西安坐标系"之间的转换精度和可靠性进行了探讨,通过具体数据的分析计算得出,2套坐标系之间转换切实可行,完全满足精度要求。 相似文献
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随着我国GPS一级网的成功建立及GPS二级网工作的顺利展开,建立我国高精度地心坐标系统的条件已日臻成熟。目前为了满足某些工程测量的需要,利用现有的全国高精度GPS一级网及天文大地网资料,求得了WGS—84坐标系与BJZ54坐标系(整体平差转换值)的转换参数,该转换参数的出现,已引起有关专家及应用部门的关注。 相似文献
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GPS接收机接收到的是WGS84坐标,目前我国海图采用的是北京54坐标系,这对海图用户带来使用上的不便或误解.所以直接出版WGS84坐标海图已经成为时代的必然要求.海图测绘部门已经着手全面生产和出版WCS84海图,这一工作需要大量的人力物力和时间.为了使现有北京54海图在这一过渡期内继续使用,探讨使用海图小改正的方法实现北京54海图向WGS84海图的快速转换,是可行的、经济的和有效的.文章分析了各地区坐标改正数的大小和变化规律,提出海图小改正的具体方法. 相似文献
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由于RTK的测量成果为WGS 84坐标,而实际应用中需要的一般是国家坐标或地方独立坐标,因此需要进行工地校正。针对RTK工地校正过程中公共点的WGS 84坐标存在的系统误差影响坐标转换参数的情况,探讨了利用加权三次曲面拟合法对坐标转换残差进行拟合并对RTK工地校正进行修正的可行性,通过工程实例证明了该方法的有效性。 相似文献
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A key problem of contemporary static and kinematic positioning is the problem of transformation of conformai coordinates of universal Mercator projection (UMP) type from a local datum (regional, national) to a global datum, for instance, the World Geodetic System 1984 (WGS 84) with reference to Boyle (1987). Such a problem is met if we use WGS 84 GPS‐derived ellipsoidal coordinates of a point for localization in a local chart of UMP type. In this article we derive and test the equations of a curvilinear datum transformation of ellipsoidal GPS coordinates in a global datum to conformai coordinates of UMP type in a local datum. The curvilinear datum transformation includes three parameters for translation, three parameters for rotation, one scale parameter, and two form parameters which account for a change in the semimajor axis and in the relative eccentricity of the reference ellipsoid. 相似文献
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Nigel R. L. Gooding 《Marine Geodesy》2013,36(3-4):197-203
Abstract The historical development of positioning in relation to the nautical chart is described. Present nautical charts are largely based on geodetic surveys which date from the nineteenth and early twentieth centuries. This gave rise to the use of many local datums and there has been a need to provide the mariner with information to enable him to transfer his position from one chart to an adjacent one on a different datum. The availability of the Global Positioning System (GPS) and the World Geodetic System 1984 (WGS84) datum enables positioning on a single worldwide datum to become a reality. The important factors affecting the adoption of WGS84 as the datum for nautical charts—namely, data availability and the practical and political considerations—are discussed. New developments in the use of nautical charts, the electronic chart display and information systems, and the delineation of international boundaries and territorial limits all give rise to the requirement for improved positional accuracies. Recent experience in the use of GPS both in the provision of control for shore stations of electronic position‐fixing systems and the provision of position for hydrographic surveys is briefly discussed. 相似文献
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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