4 results about "Normal height" patented technology

The application discloses a shaft elevation transfer method based on gravity measurement, comprising the following steps: arranging an upper known point and a lower to-be-measured point in a shaft, and obtaining a measured gravity value and a normal height of the upper known point; calculating the normal gravity of the upper known point according to the geodetic coordinates of the upper known point, and obtaining the disturbing gravity of the upper known point according to the measured gravity value and the normal gravity; setting auxiliary points above the plumb of each of the upper known point and the lower to-be-measured point, and obtaining the disturbing gravity gradient of each measuring point according to the gravity observation value of each measuring point and the corresponding auxiliary point; constructing a height difference transfer constraint model based on the disturbing gravity and the disturbing gravity gradient of the upper known point and iteratively solving to obtain the geodetic height difference between the upper known point and the lower to-be-measured point; and calculating the normal height difference between the upper known point and the lower to-be-measured point based on the geodetic height difference, and determining the normal height of the lower to-be-measured point according to the normal height of the upper known point and the normal height difference.

The invention relates to the technical field of remote sensing image processing, in particular to a satellite image RPC parameter elevation optimization method fused with a gravity field model. Comprising the following steps: S1, aerial triangulation encryption and key point acquisition; s2, coordinate transformation; s3, primarily calculating geodetic coordinates by the model; s4, carrying out elevation conversion on the EGM2008 model; s5, constructing a block adjustment model considering the gravity field; s6, iterative solution and output are carried out; according to the method, the earth height (H) directly output by the RPC model is accurately converted into the normal height (h) by introducing the EGM2008 earth gravitational field model, so that the elevation system error caused by the fluctuation of the geoid in a complex region with abnormal and remarkable gravity is effectively eliminated. The normal height is used as a hard constraint to be fused into block adjustment, and the RPC parameters are optimized in a targeted manner, so that the final elevation positioning precision is improved by more than 30% compared with that of a traditional method, and the elevation precision requirement of topographic map surveying and mapping with the measuring scale of 1: 10000 and even 1: 2000 can be met.

The application provides an intelligent leveling system based on three GNSS coordinate cooperation and a measuring method thereof. The system comprises an intelligent level gauge, a first intelligent leveling rod and a second intelligent leveling rod. All of them are provided with independent GNSS modules and can obtain three-dimensional coordinates in real time. The level gauge can obtain the front and rear sight distances through coordinate inversion and calculate the sight distance difference, and then send the sight distance difference to the display screens of the two rods to guide the first rod to be in place. The leveling rod is provided with an inclination sensor, which can automatically switch among the three states of movement guidance, rod monitoring and righting recording according to the inclination angle, and automatically record the three-dimensional coordinates to form an electronic notebook at the righting moment. The leveling rod can be switched to an RTK mobile station through one key, which is used for layout and recovery of buried leveling points and accurate recovery of temporary leveling points the next day. When the leveling rod is righted for the first time after station migration, the coordinates are automatically compared to realize the detection and tracing of the centimeter-level error. The system can synchronously collect the geodetic height and normal height of each rod point, automatically calculate the height anomaly value and cumulatively form a local height anomaly model.

The embodiment of the application discloses a data processing method and related device, when the availability of height anomaly data in a first height system is low and the availability of height anomaly data in a second height system is high, the height anomaly data corresponding to multiple positions in the second height system can be obtained, the difference between the height anomaly data of the multiple positions in the second height system is used to simulate the difference between the height anomaly data of the multiple positions in the first height system, so that when there is a position in the multiple positions corresponding to normal height data in the first height system, the normal height data corresponding to the remaining positions in the first height system can be analyzed by combining the difference between the height anomaly data and the difference between the geodetic height data corresponding to the multiple positions in the first height system, the accuracy of the normal height data is ensured, and the data analysis difficulty is reduced and the data analysis efficiency is improved.