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
CN113532377BActive Publication Date: 2022-02-22自然资源部国土卫星遥感应用中心
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
自然资源部国土卫星遥感应用中心
Publication Date
2022-02-22

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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.
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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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