Optical Image and Laser Altimeter Data Adjustment Method Based on Rational Function Model

Abstract

The invention relates to a method for adjusting optical image and laser altimetry data based on a rational function model. The method includes the following steps: S1: Acquire corresponding optical image data and laser altimetry data; S2: Establish optical image data and laser altimetry data Rational function model of altimetry data; S3: According to the rational function model, build a deviation compensation model including the parameters to be obtained, and establish a joint adjustment model of optical imagery and laser altimetry data. The joint adjustment model includes virtual control points Error equation, the virtual control point is the corresponding point of the optical image and laser altimetry data; S4: Solve the joint adjustment model using the total least squares method based on the partial-EIV model, and obtain the parameters to be requested of the deviation compensation model; S5: According to the deviation compensation model, the elevation positioning result of the image is obtained. Compared with the prior art, the present invention has the advantages of high adjustment accuracy, effectively improving the elevation positioning accuracy of images, and the like.

Description

technical field [0001] The invention relates to the technical field of laser height measurement, in particular to an optical image and laser height measurement data adjustment method based on a rational function model. Background technique [0002] Rational function model (RFM) is a generalized imaging model independent of photography platforms and sensors. It is generated by a strict imaging model. It is actually a numerical approximation to the strict imaging model. Although there is no strict imaging model in theory Strict, but the positioning accuracy in actual production can reach the accuracy of the strict imaging model. The error of the strict imaging model also exists in the RFM, and the RFM can be compensated for the deviation through the image square correction parameters. In traditional photogrammetry, it is necessary to add ground control points to generate a digital elevation model (Digital Elevation Model, DEM) by aerial triangulation. For large-scale area ne...

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Problems solved by technology

[0003] However, when only laser altimetry is used as the elevation constraint to add the adjustment model, the entire regional network to be adjusted lacks plane control, and the degree of freedom of the regional network is relatively high. Directly solving the parameters to be adjusted as free unknowns will lead to the normal equation The ill condition of the adjustment leads to instability of the adjustment accuracy, and in the adjustment, the coefficient matrix of the image square correction parameter contains error items, which is not suitable for the G-M model (Gauss-Markov model), which is the most basic measurement adjustment. mathematical model of

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