What is a survey control network and what is a construction survey control network?

The survey control network is a network composed of many survey control points according to certain technical requirements to obtain the plane coordinates or elevation of the points.

Classical measurement control networks can be roughly divided into three types: plane control networks, elevation control networks and gravity control networks.

1. The plane control network is to form a network of geodetic control points in a certain form of graphics, and determine the coordinates of the network points, or calculate the coordinates of the network points by measuring the angle, side length and azimuth angle in the network.

2. The elevation control network is composed of leveling routes that connect each elevation control point. By leveling, the height difference between adjacent leveling points can be found. In order to calculate the elevation of each leveling point, it is necessary to select a certain elevation starting point, such as the leveling origin; It is also necessary to specify the elevation starting surface, such as the geoid level.

3. The gravity control network is a network composed of absolute gravity points and relative gravity points, which is the realization of a national gravity benchmark. Both the observation of the plane control network and the elevation control network are related to the earth's gravity field, especially the elevation control network is more closely related to gravity. Therefore, gravity measurement is also an important part of the establishment of plane and elevation control networks.

Since the network must be composed of points and lines, the coordinates of the points must be accurate and have archives, (the archives record the specific location, what are the signs, what is the material), after the country determines the first-level control point, the connection between the points will form a control network, each province, city, and county shall establish their own control points according to the level and accuracy requirements, and the control points at each level shall be connected to form a control network, for example: if the area you want to measure is located within a county, It is necessary to extend the control network formed by the county-level control point (accurate coordinates) to the target inflection point, so as to get the coordinates of the next level that is the point you want to measure.

Control measurement refers to the determination of the plane position and elevation of a series of control points in the survey area according to the accuracy required by the measurement task, and the establishment of a measurement control network as the basis for various measurements.

The control network has the function of controlling the overall situation and limiting the accumulation of measurement errors, which is the basis for various measurement work. For topographic mapping, hierarchical control is the basis for extending the root control to ensure that the surveyed topographic maps can be stitched together into a whole. For engineering surveying, it is often necessary to lay a special control network as the basis for construction lofting and deformation observation.

Control the measurement and its tasks.

In the engineering construction area, the horizontal position and elevation of a series of control points are determined with the necessary accuracy, and the engineering control network is established as the basis for topographic survey and engineering survey, and this survey work is called control survey.

The specific tasks of control surveying in the three stages of engineering construction are: establishing a mapping control network in the survey and design stage, which is used as the basis for various large-scale surveying and mapping; Establish a construction control network in the construction stage as the basis for construction lofting measurement; In the operation stage, a deformation observation and control network is established as the basis for the deformation observation of engineering buildings.

The construction survey and control network is a survey (mainly referring to coordinates) control network laid out for the construction of the project.

The layout of the construction control network should be considered according to the general layout of the building (structure) and the topographical conditions of the construction area. For mountainous areas with large undulating terrain and areas that cross rivers, the establishment of a triangulation network or GPS network can generally be considered. For areas where the terrain is flat but the visibility is difficult, such as residential areas and industrial sites that have been reconstructed or expanded, you can consider laying a wire network.

For industrial and civil construction areas with dense buildings and regular layouts, the construction control network can also be laid into a regular rectangular grid, that is, the building grid this sail.

The task of building construction control measurement is to establish a construction control network. The control network established in the survey stage, because the design position of various buildings has not yet been determined, can not consider the requirements of construction, and the distribution, density and accuracy of control points are difficult to meet the requirements of construction survey. In addition, due to site leveling and earthwork filling, most of the control points were destroyed.

Therefore, before construction, the construction control network should be re-established.

Most of the industrial plants, civil buildings, roads, etc. are laid in parallel or perpendicular directions to each other, therefore, in the new construction.

On large and medium-sized building construction sites, the construction control network is generally laid out into a square or rectangular grid, which is called.

Building a grid (or rectangular grid).For the design of buildings that are not very complex in an area of small size, one or several baselines are often laid parallel to the axis of the main building as the plane control of the construction survey, which is called.

Building baseline. There are also laying wires as a plane control network for building construction.

Three principles of measuring the potato circle: first the whole and then the part, first control and then the broken part, from high to low.

First control and then broken part): For example, surveying and mapping topographic map, before the survey work begins, it is necessary to lay out the plane control network and the elevation control network, first carry out the measurement work of the control network, and then carry out the encryption control network work hand closure and fragment measurement. The measurement of the control network is the basis for the follow-up work, and it is also the core work to ensure the accuracy of the measurement of potato cracking.

Summary. Hello, the control network measurement is also surveying controlnetwork, which belongs to the category of control measurement;

It means: a network composed of a series of interconnected fixed points laid out on the ground according to a certain principle, and the coordinates of the network points are measured according to a certain technical standard.

The geodetic datum control network is mainly used to accurately obtain the geodetic coordinates of the antenna origin and the antenna azimuth datum, which is used to calculate the azimuth and elevation angle of the satellite. First, the antenna origin and control network need to be determined in the field. The whole network is composed of 6 points with forced centering observation piers, and point 0 is the antenna origin.

The elevation control network is composed of 4 leveling points, which are jointly measured with the national geoid level network, measured according to the second-class level, and the elevation difference between the 4 points is determined by the free network adjustment, and the error in the elevation of each point is about about BM1 as the starting point.

What does a control network measurement belong to? What do you mean? The main role.

Hello, the control network measurement is also surveying controlnetwork, which belongs to the category of control measurement; It means: a network composed of a series of interconnected fixed points laid out on the ground according to a certain principle, and the coordinates of the network points are measured according to a certain technical standard. The geodetic datum control network is mainly used to accurately obtain the geodetic coordinates of the antenna origin and the azimuth datum of the late draft antenna, and the Jingliang is used to calculate the azimuth and elevation angle of the satellite.

First, the antenna origin and control network need to be determined in the field. The whole network is composed of 6 points with forced centering observation piers, and point 0 is the antenna origin. The elevation control network is composed of 4 leveling points, which are jointly measured with the national geoid level network, measured according to the second-class level, and the elevation difference between the 4 points is determined by the free network adjustment, and the error in the elevation of each point is about about BM1 as the starting point.

In addition, it does the following:1Provide precise control for topographic mapping; 2.to provide information for the study of the shape, size and other scientific problems of the Earth; 3.It provides information for the construction of national grinding and anti-stupidity and space technology.