1) river-crossing leveling technique
跨河水准测量技术
2) river-crossing leveling
跨河水准测量
1.
The general river-crossing leveling methods usually require better inter-visibility condition.
常规跨河水准测量均要求具有良好的通视条件,其场地选择困难,观测操作复杂,目标照准困难,大气垂直折光影响严重,气象因素干扰大,工期长、效率低,适用的跨河距离有限,因此,在现有技术条件下,寻求一种精度优良、效率更高、不受环境影响而又易于推广的跨河水准测量方法,以取代传统高程传递手段势在必行。
2.
Through experiment in the field and data analysis, the optical micrometry method forriver-crossing leveling was proved to be of feasibility.
本文根据特大型桥梁工程施工对高程控制的精度要求，推算高程控制网的必要精度，提出了虎门大桥施工高程控制网的布设和观测方案，根据经济性原则，进行跨河水准测量实验，并对实验数据进行分析处理，研究水准仪光学测微法在长距离等级跨河水准测量中应用的可行性。
3) the first class river-crossing leveling
一等跨河水准测量
1.
Based on precision analysis,it is drawn a conclusion in theory that trigonometric leveling can replace the first class river-crossing leveling in the engineering in a certain conditions.
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。
2.
Based on precision analysis,it draws a conclusion in theory that trigonometric leveling can replace the first class river-crossing leveling in the engineering in certain conditions.
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。
4) third-order river-crossing leveling
三等跨河水准测量
5) river crossing leveling
跨河水准
1.
Research on river crossing leveling based on precise trigonometric leveling;
应用精密三角高程测量实现跨河水准的研究
2.
When completed river crossing leveling by means of trigonometric leveling with distance measurement, there are two types of observed values.
采用测距三角高程法进行跨河水准测量 ,可以不量取仪器高 ,但观测值中有两类不同的观测量。
3.
the experiment programme of trigonometrical leveling by river cross-ing electromagnetic distance measuremei1t is presented and using trigonometrical leveling by elec-tromagnetic distance measurement in place of river crossing leveling isdiscussed in theory and ex-periment,then a conclusion valuable for reference is give
本文介绍了跨河测距三角高程的试验方案，并从理论和试验两个方面讨论了测距三角高程代替跨河水准测量，得出了一些有参考价值的结论。
6) river-crossing leveling
跨河水准
1.
When the level route needs to cross over a large water surface or awide gorge,but because the sight goesbeyond the length of traditional level or the distance between foresight and backsight is big,it must adopt river-crossing leveling method so as to pass the height on this bank to the other bank with the appointed precision,which is very difficult in the vertical control survey.
当水准路线需要跨越大的水面或宽的峡谷时,由于视线超出常规水准的长度或前后视距相差很大,就必须采用跨河水准测量的方法,以指定的精度等级将本岸的高程传递到对岸。
2.
Based on Large Bridge Construnction and Specialty of river-crossing leveling,Total Station Instrument was applied to trigonometric leveling with distant measure river-crossing leveling,and leveling network was adjusted.
结合某大型桥量建设中的高程控制测量的实施和精度要求,在论述桥梁高程控制测量的原理、设计方案、测量程度和精度分析等问题的基础上,依据跨河水准测量的特点,利用全站仪完成了高程控制网中的跨河水准测量,并通过程序对跨河水准网进行严密平差计算,最后估算了跨河测距三角高程的精度。
3.
This paper introduced the field selection,field planning,vane production,observation methods,and record format of river-crossing leveling in detail.
详细介绍了跨河水准测量的场地选择、场地布设、觇板制作、观测方法、记录格式等内容。
补充资料：几何水准测量
水准测量又名“几何水准测量”，是用水准仪和水准尺测定地面上两点间高差的方法。在地面两点间安置水准仪，观测竖立在两点上的水准标尺，按尺上读数推算两点间的高差。通常由水准原点或任一已知高程点出发，沿选定的水准路线逐站测定各点的高程。由于不同高程的水准面不平行，沿不同路线测得的两点间高差将有差异，所以在整理国家水准测量成果时，须按所采用的正常高系统加以必要的改正，以求得正确的高程。我国国家水准测量依精度不同分为一、二、三、四等。一、二等水准测量称为“精密水准测量”，是国家高程控制的全面基础，可为研究地壳形变等提供数据。三、四等水准测量直接为地形测图和各种工程建设提供所必需的高程控制。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条