共查询到18条相似文献，搜索用时 328 毫秒
1.
2.
介绍了电子水准仪的原理、特点及性能指标．着重探讨了利用电子水准仪进行高差观测的观测模式和参数设定等技术问题，利用电子水准仪观测数据分析了观测精度，得出结论并为电子水准仪的合理应用提出建议。 相似文献
3.
GPS与数字水准仪相结合进行三维控制网的布设 总被引：2，自引：1，他引：1
通过三维控制网的实际布设，对GPS平面控制网的精度和数字水准仪布设的高程控制网的精度进行了分析探讨，并对二者如何更加有效的结合提出了几点有益的见解。 相似文献
4.
5.
6.
7.
论述了数字水准仪的基本特点,基于这些特点将数字水准仪主机、条码尺和数据处理软件作为一个整体进行系统检定是一种恰当的方法。文中给出了系统检定的原理、测点数及位移量的确定方法。最后用模拟数据进行了计算,模拟计算结果表明:正确的位移量是求解尺度改正数的前提。 相似文献
8.
利用三角高程代替一等跨河水准的可行性研究 总被引：2，自引：0，他引：2
从三角高程测量的计算公式出发,提出了保证测量精度的一些有效措施,从理论上论证了在一定条件下,用三角高程测量可以达到一等水准测量的精度要求。然后在工程实践中分别用两种测量方法进行施测,并进行平差改正与精度分析,结果表明:只要采取一定的措施,用三角高程代替一等跨河水准测量,不仅能保证测量精度,而且可以提高工作效率。 相似文献
9.
滩地水准测量的精度分析 总被引：1，自引：0，他引：1
本文根据1981—1983年浙江省滩地水准测量所得的资料,简要介绍了在滩面上进行水准测量的不利因素及其克服的方法。并估算了水准仪、经纬仪测滩结果的误差范围。 相似文献
10.
11.
High precision geoid models HKGEOID-2000 for Hong Kong and SZGEOID-2000 for Shenzhen, China, have been developed with a hybrid approach of so-called sequential processing, using high precision GPS/leveling data, land and sea gravity anomalies, and digital terrain models. These two local geoid models have the same 1-km resolution. The estimated accuracy (external accuracy) is better than 1.7 cm for HKGEOID-2000 and 1.4 cm for SZGEOID-2000. Some common areas are covered by HKGEOID-2000 and SZGEOID-2000. So these two geoid models, along with high quality GPS/leveling data collected on the overlapping areas, can be used to detect the systematic bias between HKGEOID-2000 and SZGEOID-2000, as well as the difference between Hong Kong Principal Datum and 1956 yellow sea height datum of China, yielding RMS errors of 1.011 m and 1,003 m, respectively. Moreover, HKGEOID-2000, along with GPS ellipsoidal heights, is employed to determine the errors of the “orthometric heights” from purely trigonometric heighting, yielding an RMS error of 0.102 m. The combination of SZGEOID-2000 and GPS ellipsoidal heights has been used to replace the traditional spirit leveling and mapping, called GPS mapping. 相似文献
12.
High precision geoid models HKGEOID-2000 for Hong Kong and SZGEOID-2000 for Shenzhen, China, have been developed with a hybrid approach of so-called sequential processing, using high precision GPS/leveling data, land and sea gravity anomalies, and digital terrain models. These two local geoid models have the same 1-km resolution. The estimated accuracy (external accuracy) is better than 1.7 cm for HKGEOID-2000 and 1.4 cm for SZGEOID-2000. Some common areas are covered by HKGEOID-2000 and SZGEOID-2000. So these two geoid models, along with high quality GPS/leveling data collected on the overlapping areas, can be used to detect the systematic bias between HKGEOID-2000 and SZGEOID-2000, as well as the difference between Hong Kong Principal Datum and 1956 yellow sea height datum of China, yielding RMS errors of 1.011 m and 1,003 m, respectively. Moreover, HKGEOID-2000, along with GPS ellipsoidal heights, is employed to determine the errors of the “orthometric heights” from purely trigonometric heighting, yielding an RMS error of 0.102 m. The combination of SZGEOID-2000 and GPS ellipsoidal heights has been used to replace the traditional spirit leveling and mapping, called GPS mapping. 相似文献
13.
14.
海面倾斜与高程基准密切相关,它已经受到大地测量学界和海洋学界的重视.进一步讨论了大地水准的测量精度,指出了大地(几何)水准与沿海验潮资料的不符是由于海面的倾斜;分析了海面倾斜的机理,其中包括海流、海水密度分布、气压、台风引起的破碎波等的作用;提出了用海水异常密度的三维分布计算大地水准面的扰动,实质上它反映了海面的倾斜,该量占大地水准测量结果的73%,这进一步说明密度的异常乃是我国沿海海面倾斜的主要原因. 相似文献
15.
16.
17.