A Method for Improving Height Positioning Accuracy Using Digital Base Height Ratio Time Model
A positioning accuracy and high-ratio technology, which is applied to instruments, surveying and navigation, and measuring devices, can solve the problem of difficulty in obtaining high-quality and large-overlap stereo image pairs, and achieve the effects of improving accuracy, reducing image quality, and improving efficiency
Active Publication Date: 2017-01-04
PEKING UNIV
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[0004] The purpose of the present invention is to provide a method for constructing a camera array system using a digital base-height ratio time model, thereby improving the height positioning accuracy of aerial stereo mapping. It is difficult to obtain high-quality, large-overlap stereo image pairs for aerial photography cameras transformed from digital cameras, and this method can obtain multiple sets of redundant stereo image pairs, effectively improving the elevation positioning accuracy of stereo mapping
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[0036] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0037] figure 1 It is a flow chart of the elevation positioning accuracy improvement method using the digital base height ratio time model in the present invention, as shown in the figure, the present invention includes the following steps:
[0038] S101. Using the digital base height ratio time model to establish the intersection image number N and elevation positioning accuracy M of stereoscopic mapping Z the associated model;
[0039] ① The calculation formula of base height ratio R in photogrammetry is: In the formula, B is the length of the photographic baseline, and H is the flying height. In the present invention, because B=v·T=v·N·t, therefore, can set up base height ratio time model, in order to distinguish from the base height ratio R in classical photogrammetry, we express with digital base height ratio R' .
[0040] ...
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The invention discloses a method for improving the elevation positioning accuracy by using the digital base height ratio time model, which includes: firstly, using the digital base height ratio time model to establish a correlation model between the intersection image number N and the elevation positioning accuracy MZ of stereoscopic mapping; Second, build a camera array system based on the correlation model between the intersection image number N and the elevation positioning accuracy MZ; third, mount the camera array system on an aircraft platform to take pictures on the ground to obtain image sequences; fourth, use the multi-baseline image grouping method to The image sequence is used for stereo mapping, and the three-dimensional coordinates of ground points are solved. The present invention uses a digital base height ratio time model to build a camera array system, thereby improving the height positioning accuracy of aerial stereo mapping, and can conveniently obtain stereo image pairs with an overlap of 90% or more, significantly improving the efficiency of image acquisition and reducing redundancy. Observation values can improve the accuracy of three-dimensional coordinate calculation of ground points, especially the accuracy of elevation positioning.
Description
technical field [0001] The invention relates to the technical field of photogrammetry and remote sensing, in particular to a method for improving elevation positioning accuracy by using a digital basis-height ratio time model. Background technique [0002] Aerial photogrammetry refers to the process of continuously taking pictures of the ground with aerial photography instruments on an aircraft, and combining the steps of ground control point measurement, mapping and stereo mapping to draw a topographic map. The base-height ratio is an important parameter in photogrammetry, defined as the ratio of the photographic baseline to the aerial height. The larger the base-height ratio parameter, the higher the elevation positioning accuracy of stereo mapping. [0003] In the step of taking pictures continuously, there are mainly two methods at present: one is the single-baseline photogrammetry method, the overlapping degree of two adjacent pictures (stereo image pairs) is set to ab...
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IPC IPC(8): G01C11/00G01C11/02
Inventor 晏磊段依妮赵红颖赵汗青杨鹏王洪魏云鹏孙岩标刘飒陈瑞闫旭
Owner PEKING UNIV