What is a rearview reading of 50 and what is a rearview reading

In leveling, in order to measure the elevation of the instrument point, it is necessary to know the elevation of the original point (i.e. the starting point of the elevation calculation).

The instrument is erected, first aligned with the rear view point, because the rear view point has an elevation on the ground, the known ground elevation plus the reading of the instrument reading level, is the elevation of the instrument, and then aligned with the point to be measured, the front sight point, (the identification point on the building), because the line of sight of the level is horizontal, so see the ruler reading on the front view point is the same elevation as the instrument, and the bottom elevation of the ruler is the height of the instrument minus the reading.

So there is the front view elevation = instrument elevation - front view reading = back view elevation + back view reading - front view power.

Settlement observation: If the foreground is taken as an observation point and observed on a specified date, the settlement amount of the foresight can be known by comparing the elevations of the observation records.

The plumb distance from the ground point to the geoid is called the absolute elevation of the point, or elevation for short, and is denoted by h.

The work of measuring the elevation of ground points becomes an elevation survey.

If the leveling direction is from A to B, then point A is the rear view and point B is the front view. The elevation of point A is the rearview elevation, which is calculated internally in terms of measurement!!

Maybe there are other fields, I studied architecture, and the general level has front and back readings.

The formula for calculating the elevation code of the front view reading and the back view reading is known elevation + height difference = elevation difference to be measured = front view degree - rear vision reading.

Elevation surveys determine the measurement of the elevation of ground points. The elevation of a point generally refers to the distance from the point to the geoid along the plumb line, also known as elevation or absolute elevation. The usual methods used to measure elevation are:

Leveling, triangulation and barometric elevation. Hydrostatic leveling is also occasionally used, mainly for the transmission of elevation across the strait.

The formula for calculating the other elevations is as follows:

1. Calculation formula: two-point height difference = rear view - front view.

2. Known elevation + elevation difference = elevation to be measured, elevation difference = front vision power - rear vision reading.

3. Known elevation + known elevation point reading = h, h - point reading to be measured = elevation to be measured.

Relationship between front and back view and elevation:

Rear view reading + elevation of the rear view point = instrument line of sight height.

Instrument line of sight height - forward view reading = station elevation.

If you know that the elevation of point A is, find the elevation of point B, set up the level between the two points of AB, and the ruler is called the rear view at point A, assuming that the reading is, and then the ruler reads at point B, which is called the reading of the front and late cavity view, then B = A + rear view - front view =, the middle view should be the reading on the tower ruler between the upper and lower transverse wires of the middle wire in the level, and the distance from the instrument to the tower ruler is the banquet x100 = instrument. <>

Hello, 1Calculation formula: two-point height difference = rear view - front view.

2.Known elevation + elevation difference = elevation to be measured, elevation difference = front view power - rear vision reading. 3.

Known elevation + known elevation point reading = h, h - reading of the grip point to be measured = elevation of the dismantling tour to be measured. Rear view reading + elevation of the rear view point = instrument line of sight height. Instrument line of sight height - forward view reading = station elevation.

If it is known that the elevation of point A of the world is Yuqing, find the elevation of point B, set up the level between the two points of AB, and the ruler is called rear view at point A.