ADS40数字摄影测量中的DLG数据坐标转换     

杨卫军  林鸿  方峰  李长辉  胡耀锋  高原  蔡东涛 《地理空间信息》2011,9(3):76-78

探讨了ADS40数字摄影测量中的DLG测图数据的坐标转换,水平方向上,放弃通用软件中的七参数转换方法,而直接采用投影参数转换,垂直方向上,采用格网模拟似大地水准面精化成果,建立起严密的转换关系.同时,将转换关系与DLG数据生产紧密结合,简化了作业流程,提高作业生产效率.  相似文献   

基于VC平台的高程控制网平差软件设计与实现     

朱楠  徐良骥  郭辉  刘利君  吴鸿涛 《北京测绘》2014,(4):126-128

软件采用VC 6.0平台,基于MFC单文档工程,通过编写了闭合差计算、高程控制网间接平差与精度评定代码,实现了对原始数据的计算闭合差,间接平差与精度评定两个功能。实现数据处理软件化自动化运行,提高高程控制网数据处理和精度评定的效率,从而满足测绘专业工作人员的需要。  相似文献   

ADS80影像在甘肃省地理国情普查正射影像生产中的应用     

曹正响 《东北测绘》2014,(6):125-126,130

结合甘肃省第一次地理国情普查数字正射影像生产工作,介绍了ADS80影像数据在正射影像生产中的应用,并对关键技术环节进行了阐述。  相似文献   

Long distance transference of height datum across seas     

Li Jiancheng  Jiang Weiping 《地球空间信息科学学报》2013,16(3):1-5

This paper focuses on studying logn distance transference of height datum across seas by combining ellipsoidal height derived from GPS with gravimetric geoid height. The Yellow Sea Height Datum is transferred to Yangshan Island which is 30 km away from Luchaogang in Shanghai. The stations heights derived in this way are compared with those determined from two independent sets of the tidal observations taken in two years, and the difference values are 1.0 cm and 6.0 cm, respectively. Moreover, the derived height differences between two sections on the island are also compared with the values derived from precise leveling with respect to the same section. The result shows that the inconsistencies are only 0.2 cm and 0.7 cm, respectively.  相似文献   

A local geoid determination based on ellipsoid approximation in Western China     

Essam Ghanem  LI Jiancheng 《地球空间信息科学学报》2013,16(3):6-10

A new methodology for precise geoid determination with finest local details based on ellipsoidal approximation is presented. This methodology is formulated through the “fixed-free two-boundary value problem” based on the observable of the type modulus of gravity intensity, gravity acceleration and gravity potential at the GPS positioned stations, with support of the known geoid's potential value, W0.  相似文献   

���������Ŷ���������߳��쳣�ķ���     

张赤军  骆鸣津  王新胜  方剑 《大地测量与地球动力学》2010,30(6):42-46

??????????????????????????????????????????????????????????????????????????й?????????????б???????ó????????????????????????????y??????????????????????????????????????????е????y??????????  相似文献   

�˼��̶߳�����Ĵ��ˮ׼�����ƴ��ˮ׼��֮���     

徐新强  赵德军  楼楠 《大地测量与地球动力学》2013,33(5):75-78

???й???????????????????????SRTM3??????????????????????????????????????????????????????????????????????к?????????????????????????????1.76 m?????????????????0.03 m??  相似文献   

����ƽ�����ٶȷ��ָ�GOCE����������ģ��     

苏 勇范东明  贺全兵 《大地测量与地球动力学》2013,33(6):24-27

???????????????????????δ???????λ??????????????GOCE????2009-11-01-2010-01-31???????????????????????????????120??ε??????????GOCE-AAA01S???????????????12???????????????????????????????????????????????????????????????120??ε????????????±6.8 cm????6~120?????GOCE-AAA01S?????????EIGEN-CHAMP03S????102??????GOCE-AAA01S????????EGM96??????δ????????????????????????????λ??????г????????  相似文献   

Update of the precision geoid determination in Korea     

Tae‐Suk Bae  Jisun Lee  Jay Hyoun Kwon  Chang‐Ki Hong 《Geophysical Prospecting》2012,60(3):555-571

From the late 1990s, many studies on local geoid construction have been made in South Korea. However, the precision of the previous geoid has remained about 15 cm due to distribution and quality problems of gravity and GPS/levelling data. Since 2007, new land gravity data and GPS/levelling data have been obtained through many projects such as the Korean Land Spatilaization, Unified Control Point and Gravity survey on the Benchmark. The newly obtained data are regularly distributed to a certain degree and show much better improvement in their quality. In addition, an airborne gravity survey was conducted in 2008 to cover the Korean peninsula (South Korea only). Therefore, it is expected that the precision of the geoid could be improved. In this study, the new South Korean gravimetric geoid and hybrid geoid are presented based on land, airborne, ship‐borne, altimeter gravity data, geopotential model and topographic data. As for the methodology, the general remove‐restore approach was applied with the best chosen parameters in order to produce a precise local geoid. The global geopotential model EGM08 was used to remove the low‐frequency components using degree and order up to 360 and the short wavelength part of the gravity signal was dealt with by using the Shuttle Radar Topography Mission data. The parameters determined empirically in this study include for Stokes’ integral 0.5° and for Wong‐Gore kernel 110–120°, respectively and 10 km for both the Bjerhammar sphere depth and attenuation factor. The final gravimetric geoid in South Korea ranges from 20–31 m with a precision of 5.45 cm overall compared to 1096 GPS/levelling data. In addition, the South Korean hybrid geoid produces 3.46 cm and 3.92 cm for degrees of fitness and precision, respectively and a better statistic of 2.37 cm for plain and urban areas was achieved. The gravimetric and hybrid geoids are expected to improve further when the refined land gravity data are included in the near future.  相似文献   

Regional gravity field modeling based on rectangular harmonic analysis     

JIANG Tao  LI JianCheng  DANG YaMin  ZHANG ChuanYin  WANG ZhengTao  KE BaoGui 《中国科学:地球科学(英文版)》2014,57(7):1637-1644

Regional gravity field modeling with high-precision and high-resolution is one of the most important scientific objectives in geodesy,and can provide fundamental information for geophysics,geodynamics,seismology,and mineral exploration.Rectangular harmonic analysis(RHA)is proposed for regional gravity field modeling in this paper.By solving the Laplace’s equation of gravitational potential in local Cartesian coordinate system,the rectangular harmonic expansions of disturbing potential,gravity anomaly,gravity disturbance,geoid undulation and deflection of the vertical are derived,and so are the formula for signal degree variance and error degree variance of the rectangular harmonic coefficients(RHC).We also present the mathematical model and detailed algorithm for the solution of RHC using RHA from gravity observations.In order to reduce the edge effects caused by periodic continuation in RHA,we propose the strategy of extending the size of computation domain.The RHA-based modeling method is validated by conducting numerical experiments based on simulated ground and airborne gravity data that are generated from geopotential model EGM2008 and contaminated by Gauss white noise with standard deviation of 2 mGal.The accuracy of the 2.5′×2.5′geoid undulations computed from ground and airborne gravity data is 1 and 1.4cm,respectively.The standard error of the gravity disturbances that downward continued from the flight height of 4 km to the geoid is only 3.1 mGal.Numerical results confirm that RHA is able to provide a reliable and accurate regional gravity field model,which may be a new option for the representation of the fine structure of regional gravity field.  相似文献