With a project example,analyses the locationcal selection of the boiler house,the piping disposition and the system water power balance of heat-supply network with height difference,and puts forward feasible design schemes.

A formula of height difference precision for remote distance measurement by total station is derived in this paper.

In this article, special emphasis is laid on level survey principle: (l) under same between forword sight and backsight staffs, height difference between two points-for- word sight and backsight h=a-b.

A new method of surveying horizontal distance and elevation difference with theodolite-central hair stadia;

By practical examples,it is testified that measuring elevation differences by using RTK can raise elevation accuracy.

The calculation method of deducing horizontal distance and elevation difference between two points by utilizing the vertical angle and reading measured with theodolite.

In this paper, the design and fiels work of water pewer plant construction control netword in valley area is put forword, In the region of belt and great difference of elevation, By means of paying attention to the observation time, an de-sirable result may be achieved.

This article deduces the formula of distance on mean elevation plane measured and the formula of altitude difference when inclined distance and vertical angle are observed separately .

n high distance control measurement,the quality of the measurement can be verified by calculating the closed difference of height difference.