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A method and system for calculating ground resolution of Gaofen-4 images with different orientations

A technology of ground resolution and calculation method, applied in the field of remote sensing image processing, can solve problems such as inconsistent ground resolution, and achieve reasonable changes in ground resolution.

Active Publication Date: 2020-12-22
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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Problems solved by technology

At the same time, considering that the Gaofen-4 satellite is an area array camera, the ground resolutions corresponding to each detector imaged at the same time are inconsistent. From this point of view, previous studies have not involved

Method used

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  • A method and system for calculating ground resolution of Gaofen-4 images with different orientations
  • A method and system for calculating ground resolution of Gaofen-4 images with different orientations
  • A method and system for calculating ground resolution of Gaofen-4 images with different orientations

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Embodiment

[0105] Assuming that the coordinates of the point of interest are 120 degrees east longitude and 40 degrees latitude, the steps of calculating the ground resolution of the Gaofen No. 4 image at the point of interest are as follows with reference to the steps of the present invention:

[0106] constant:

[0107] Earth radius Re=6371km

[0108] Satellite orbit height H=35786km

[0109] Sub-satellite point ground resolution GSD 星下点 =48.62m

[0110] (1) According to the sub-satellite point resolution of the GF-4 image, calculate the half-field angle of the probe;

[0111]

[0112]

[0113] After iterative calculation θ i+1 =6.7932×10 -7

[0114] (2) According to the longitude and latitude information of the obtained interest point, calculate the longitude difference and latitude difference between the interest point and the satellite sub-satellite point;

[0115]

[0116] (3) according to the longitude difference and latitude difference of step (2), calculate the r...

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Abstract

The invention provides a different-direction Gaofen-4 image ground resolution calculating method and system. The method comprises the following steps: 1) according to Gaofen-4 image sub-satellite point resolution, calculating probe element half field angle; 2) according to latitude and longitude information of a point of interest, calculating longitude difference and latitude difference of the point of interest and a satellite sub-satellite point; 3) according to the longitude difference and the latitude difference obtained in the step 2), calculating radial side swing angle of the satellite;4) according to the radial side swing angle obtained in the step 3) and the probe element half field angle obtained in the step 1), calculating radial ground resolution of the Gaofen-4 image; 5) according to the radial side swing angle obtained in the step 3) and the probe element half field angle obtained in the step 1), calculating tangential ground resolution of the Gaofen-4 image; and 6) according to the radial and tangential ground resolution of the Gaofen-4 image, calculating equivalent ground resolution of the image. The method and system are high in practicality, and can directly calculate the ground resolution of the Gaofen-4 image of the point according to the latitude and longitude information of any point of interest.

Description

technical field [0001] The invention relates to a method and system for calculating the ground resolution of Gaofen-4 images with different orientations. The invention belongs to the field of remote sensing image processing, and specifically relates to calculating the ground resolution of Gaofen-4 images according to different orientations of satellites, and other geosynchronous orbit satellites. The calculation of image ground resolution can also refer to it. Background technique [0002] The Gaofen-4 satellite is China's first remote sensing satellite in geosynchronous orbit. It is fixed over the equator at an altitude of about 36,000 kilometers from the ground, and takes pictures of China and its surrounding countries through pointing control. Satellite images cover visible panchromatic, visible multispectral and mid-wave infrared bands, among which the resolution of panchromatic and multi-spectral sub-satellite points is better than 50m, and the resolution of mid-wave in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
CPCG06T7/0002G06T2207/10032G06T2207/30181
Inventor 易维徐文曾湧原征
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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