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A method of using Gaofen-7 laser altimetry data to assist block adjustment

An auxiliary area and network adjustment technology, applied in the field of satellite data processing, to achieve the effect of improving elevation accuracy and realizing geometric accuracy

Active Publication Date: 2022-02-22
自然资源部国土卫星遥感应用中心
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method of using Gaofen No. 7 laser altimetry data to assist block adjustment, thereby solving the aforementioned problems in the prior art

Method used

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  • A method of using Gaofen-7 laser altimetry data to assist block adjustment
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  • A method of using Gaofen-7 laser altimetry data to assist block adjustment

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Embodiment 1

[0068] This embodiment provides a method of using Gaofen-7 laser altimetry data to assist block adjustment, such as figure 1 shown, including the following steps:

[0069] S1, using the Gaofen No. 7 laser altimetry system to obtain the original data of laser altimetry, and after a series of fine correction processes, a usable laser altimetry standard product is formed, including three-dimensional coordinates of laser altimetry points, footprint images, and laser altimetry High point footprint image point coordinates;

[0070] S2. Construct the regional network from the obtained stereoscopic image, and perform connection point matching to obtain a sufficient number of evenly distributed connection points, and carry out free network adjustment based on the rational function model to realize the high-precision relative orientation of the regional network image and obtain the relative orientation after the stereoscopic image;

[0071] S3, according to the three-dimensional coord...

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Abstract

The invention discloses a method for using Gaofen-7 laser altimetry data to assist regional network adjustment. The method combines the footprint image of Gaofen-7 laser altimetry data to realize automatic elevation control point based on laser altimetry data. Extracted and established a joint area network adjustment model of the laser altimetry data-assisted stereo image, realizing the model unification under the conditions of no control, field control and elevation control; the laser altimetry data was applied to the adjustment calculation as an elevation control , to improve the geometric accuracy of regional images. The method described in the present invention can greatly improve the elevation accuracy of the area network by using only laser altimetry data as elevation control in areas covering different terrain types.

Description

technical field [0001] The invention relates to the technical field of satellite data processing, in particular to a method for assisting area network adjustment by using Gaofen-7 laser altimetry data. Background technique [0002] Improving the accuracy of block adjustments with few or no ground control points is one of the core issues and a major technical difficulty in realizing high-precision mapping in difficult areas of overseas and field measurement and control. The GF-7 laser altimetry data has extremely high elevation accuracy, and is acquired synchronously with the stereo image, with similar error characteristics and high relative accuracy. In order to make full use of the above characteristics and play the role of the footprint image laser spot ground information, there is an urgent need A stereo image joint block adjustment method assisted by laser altimetry data of Gaofen-7 satellite. Contents of the invention [0003] The purpose of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C5/00G06T3/00G06T5/00G06T7/521
CPCG01C5/00G06T7/521G06T3/02G06T5/80
Inventor 唐新明刘昌儒李鸿洲薛白李国元王霞王洋洋
Owner 自然资源部国土卫星遥感应用中心
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