The invention relates to a method for measuring and arranging a control network in an area with dense buildings. A target cooperation manner of a total station is used, reflector plates are pasted tothe side surfaces of the building and forms a triangular lock network with a temporary observation point in the ground, the lengths of triangle sides and diagonals are observed in the field, and the construction control network suitable for the construction area with dense building distribution is established via rigorous adjustment calculation. The method is higher in practically, improves the working efficiency, ensures the location precision, effectively solves the problem that control points in the construction area with dense buildings is difficulty in intervisibility and not easy to buryor protect, and is expansible and easy to use.

Method for measuring and arranging control network in area with dense buildings

The invention discloses a railway track control network triangle elevation data correction processing method. The railway track control network triangle elevation data correction processing method comprises the steps that a closure difference is obtained through a closure relationship between an asymmetric observation segment and a symmetric observation segment on a single observation station, theclosure difference is evenly distributed on the asymmetric observation segment to obtain exact values of unstable segments, so on to the other segments to obtain the exact values of all elevation difference segments on a line, and finally accurate elevation values of all CPIII points on the line are obtained through adjustment processing. Compared with a leveling method, according to the railwaytrack control network triangle elevation data correction processing method, the measurement efficiency is greatly improved, and at the same time the number of people and instruments necessary for themeasurement are reduced since plane observation can be simultaneously performed; and compared with the traditional one-way triangle elevation network, through the distribution of the closure difference, the influence of asymmetric observation on an indirect elevation difference is effectively eliminated, and stability of the one-way triangle elevation network and accuracy of observed data are improved.

Railway track control network triangle elevation data correction processing method

The invention relates to the field of geographic survey, and discloses a processing method and device for high-accuracy navigation map elevation data. The method comprises the following steps that: splicing road section LINK between road intersections to generate spliced road sections; calculating the height difference sum of each section of LINK in each spliced road section as the relative elevation data of each spliced road section; according to a minimum independent closed ring search algorithm, obtaining the minimum independent closed ring set of a road network formed by the spliced road sections; calculating the closure error of each minimum independent closed ring in the minimum independent closed ring set; according to the closure error of each minimum independent closed ring, obtaining the elevation correction value of each spliced road section; according to a preset weight value and the elevation correction value of each spliced road section, calculating the elevation correction value of each shape point between a starting node and an end node on each spliced road section; and selecting the node of the known practical elevation as a counting starting point to realize the reconstruction of the elevation data. By use of the method, the abnormal elevation data in the road measurement data is effectively corrected, and the accuracy of a high-accuracy navigation map is improved.

Processing method and device for high-accuracy navigation map elevation data

The invention discloses a railway track control network trigonometric leveling and data processing method. According to the method, first, an observation station is additionally arranged between two observation stations at a starting or ending position of a line; then, a direct altitude difference network the same as a plane measurement network in type is obtained through slant distance and vertical angle observation values; next, indirect altitude difference values among all observation segments are obtained by solving differences among direct altitude differences; the altitude difference values among all the unstable observation segments in the line are eliminated; accurate altitude differences observed by the additionally arranged observation station are added into original data, altitude difference accurate values among all unstable observation segments in a next observation station are obtained through differencing under a closed condition, and finally altitude difference accuratevalues among all CPIII points are obtained; and last, through adjustment processing, accurate elevation values of the CPIII points are obtained. Through the method, working efficiency is greatly improved, and the accuracy of observation data is improved.

Railway track control network trigonometric leveling and data processing method

The invention discloses a method and system for conducting unilateral measurement on orbit control net pile points. The method comprises the steps that height differences, measured by all free measuring stations, of adjacent pile points of an orbit control net on a unilateral line are recorded; a trigonometric leveling network is built in the mode that a three-side level closed ring is built through every three adjacent pile points; for each closed ring of the trigonometric leveling network, three-side level difference closure error counting is conducted according to the level difference amongthe three adjacent pile points of the closed ring; whether the level measurement result on the unilateral line is qualified or not is judged according to the three-side level difference closure errorcounting result. Accordingly, unilateral measurement can be conducted on upstream or downstream CPIII points of the line, and operation and maintenance of a rail section of a V-shaped skylight duringrailway operation are facilitated.

Method and system for conducting unilateral measurement on orbit control net pile points

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Method and system for conducting unilateral measurement on orbit control net pile points