Digital orthophoto map generation method based on element level
A digital orthophoto, level technology, applied in image enhancement, image analysis, image data processing, etc., can solve problems such as insufficient automation and informatization, inability to effectively utilize historical data, and inability to completely retain valid data, etc. The effect of reducing the workload of manual processing, shortening the whole cycle and increasing reliability
Pending Publication Date: 2021-12-24
ZHEJIANG INST OF SURVEYING & MAPPING SCI & TECH
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[0003] At present, the traditional aerial digital orthophoto production methods are all-element generation methods, that is, after the aerial photography data is obtained, the image data is encrypted from the air, color processing, digital elevation model extraction, digital elevation model editing, digital orthophoto differentiation, etc. Correction, mosaic line extraction, mosaic line editing, image mosaicing, drawing editing and other links are processed in the whole process, the workload is heavy, the degree of automation and informatization is insufficient, the historical data cannot be effectively used, and the information in the production process cannot be completely preserved. Effective data, low reusability of later results
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Embodiment 1
[0070] This embodiment is a method for generating digital orthophoto maps based on element levels, such as figure 1 shown, including the following steps:
[0071] 1. If figure 2 As shown, the outer azimuth angle is corrected based on the least square method, and the outer azimuth angle is calculated using formulas (1) and (2),
[0072]
[0073]
[0074] Among them, x, y are the internal orientation elements of the image; x 0 ,y 0 , f is the inner azimuth element of the image; Xs, Ys, Zs are the outer azimuth elements; ψ, ω, κ are the outer azimuth elements; X A , Y A ,Z A The three-dimensional coordinates of the field control points laid out for the calibration field;
[0075] x and y are observation values, and the corresponding correction numbers are Vx and Vy respectively, ψ, ω, and κ are also introduced as observation values into correction numbers Vψ, Vω, Vκ, and linearized error equations (3) and (4) are obtained:
[0076]
[0077]
[0078] Without ...
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The invention discloses a digital orthophoto map generation method based on an element level. The method comprises the following steps: correcting an external azimuth angle element based on a least square method: correcting the external azimuth angle element by utilizing a least square iteration method based on known data of a calibration field and camera calibration parameters; carrying out regional terrain segmentation based on multi-source data and obtaining a digital elevation model; and quickly correcting the overhead ground feature based on feature line extraction: manually collecting or automatically extracting the feature line of the overhead ground feature and endowing the feature name identifier and the layer number attribute to form a corresponding overhead ground feature library, and performing secondary processing on the processed digital elevation model by using the overhead ground feature library to realize the quick correction of the overhead ground feature. According to the invention, the processing result of the overhead ground object in the digital orthoimage production can be effectively reserved, the reusability of the result is improved, the automation and informatization degree of the digital orthoimage production can be improved, and the workload of manual intervention is reduced.
Description
technical field [0001] The invention belongs to the technical field of digital orthophoto map generation, and in particular relates to a method for generating a digital orthophoto map based on element levels. Background technique [0002] The production of digital orthophoto images is to complete the aerial three-dimensional encryption by using the field image control points after obtaining the aerial photography data. On this basis, the digital elevation model is used to perform digital differential correction on the original images one by one, and then cut according to a certain map range. Cut to produce the final digital orthophoto results. [0003] At present, the traditional aerial digital orthophoto production methods are all-element generation methods, that is, after the aerial photography data is obtained, the image data is encrypted from the air, color processing, digital elevation model extraction, digital elevation model editing, digital orthophoto differentiation...
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Login to View More IPC IPC(8): G06T7/11G06T7/136G06T5/50G06T5/00G06K9/62G06F17/11
CPCG06T7/11G06T5/50G06T7/136G06F17/11G06F18/23G06T5/70
Inventor 蔡志刚刘微微骆光飞高亚萍王艳刘春菊
Owner ZHEJIANG INST OF SURVEYING & MAPPING SCI & TECH