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Airborne digital topographic data compression method for low altitude penetration

A technology of data compression and digital terrain, applied in image data processing, instruments, calculations, etc., can solve the problems of restricting the use of common data storage devices, and achieve the effect of reducing storage space

Inactive Publication Date: 2014-11-19
中国航天科技集团公司第四研究院四0一所
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Problems solved by technology

On the other hand, due to the particularly high requirements for electronic equipment for airborne data storage, they must have high reliability, small size, light weight, shock resistance, vibration resistance, high and low temperature resistance, and strong environmental adaptability. Limits the use of common data storage devices

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  • Airborne digital topographic data compression method for low altitude penetration
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  • Airborne digital topographic data compression method for low altitude penetration

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Embodiment Construction

[0022] Describe the present invention below in conjunction with specific embodiment:

[0023] What this embodiment uses is the terrain elevation data composed of 32×32 points of flat and complex terrain intercepted from the SRTM3 file at 108 degrees east longitude and 34 degrees north latitude. The 32×32 elevation data points are used. JPEG lossy compression can be used to obtain better compression effect. The number of selected elevation data points is a multiple of 8×8 point blocks; on the other hand, the use of 32x32 elevation data points can meet the verification requirements of this algorithm, and can also be used according to actual needs. Other 8×8 multiples of elevation data blocks.

[0024] First, the Levenberg-Marquardt method in the nonlinear least squares optimization method is adopted, the number of repetitions is 30, and the number of control iterations is 20. Perform surface fitting optimization calculation on terrain elevation data to obtain optimal parameters...

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Abstract

The invention provides a method which combines the surface fitting with a JPEG lossy compression coding technology, applies the technology combining the surface fitting with the JPEG image compression to compression of topographic data in a topographic database and a topographic matching database for real-time route planning and provides an airborne digital topographic data compression method for low altitude penetration. Firstly, surface fitting is performed on small blocks of topographic data after the large-scale topographic data is divided into small blocks of data on the basis of Marquardt, topographic data before fitting is compared with the topographic data after fitting, the residual is calculated and JPEG lossy compression is performed on the residual exceeding safe flying range (-100 m to 100 m) of a plane. The method not only retains the change of the topography, but also reduces the storage space of altitude data of the topography.

Description

technical field [0001] The invention relates to the technical field of terrain data compression, in particular to an airborne digital terrain data compression method used in low-altitude penetration. Background technique [0002] With the rapid development of modern aviation technology, digital maps have become an indispensable part of modern aircraft flight. And with the development of remote sensing technology and satellite technology, it is possible to obtain high-resolution digital terrain data. Modern topographic data acquisition technology provides people with accurate topographic data, but with the higher and higher requirements for topographic accuracy, the storage capacity of topographic data is also increasing. On the other hand, due to the particularly high requirements for electronic equipment for airborne data storage, they must have high reliability, small size, light weight, shock resistance, vibration resistance, high and low temperature resistance, and stro...

Claims

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Application Information

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IPC IPC(8): G06T9/00
Inventor 刘娜李敏哲李博宗西霞高志娟吉洁阳车明懿兰宝刚郝志鹏姜夏李金兰
Owner 中国航天科技集团公司第四研究院四0一所
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