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Disc Projection and Stitching Method of Earth Observation Images in Space with Large Field of View

A technology of earth observation and large field of view, applied in the field of space remote sensing detection, can solve problems such as no solution

Active Publication Date: 2019-06-25
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For large field of view, disk projection and stitching methods for images of different observation modes, there is currently no solution

Method used

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  • Disc Projection and Stitching Method of Earth Observation Images in Space with Large Field of View
  • Disc Projection and Stitching Method of Earth Observation Images in Space with Large Field of View
  • Disc Projection and Stitching Method of Earth Observation Images in Space with Large Field of View

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Embodiment Construction

[0023] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited thereto.

[0024] Take the large-field-of-view far-ultraviolet imager on a polar sun-synchronous orbit as an example: the height of the sun-synchronous orbit is H=830km, and the projection reference spherical radius R r =6485.0km, the average radius of the earth R E =6375.0km, projected spherical spatial resolution Δ=10km, instrument cross-track field of view F 1 =130°, the field of view angle F of the instrument along the track 2 =10°, principal distance f=18.18mm, detector virtual pixel size Δ d = 0.035 mm. The working modes of the instrument include: the staring imaging mode between the magnetic latitude ±60°, the optical axis of the instrument points to the center of the earth; the area of ​​the magnetic latitude of the north and south poles is greater than 60° or less than ...

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Abstract

The invention relates to a disc projection and splicing method for large field of view space earth observation images, belonging to the technical field of space remote sensing. The method mainly includes: calculating the conversion matrix between the geocentric coordinate system GEO and the projected disc coordinate system OPC; establishing a disc projection grid on the reference sphere in the OPC coordinate system; Latitude and longitude, and convert to GEO coordinate system at the same time; create a two-dimensional array N p Store the actual number of projected image points and the two-dimensional array R of the storage grid p Store the total intensity value of the actual projected image point of the grid point; calculate the view vector of each image point in the satellite coordinate system, and gradually transform it into the OPC coordinate system, and finally obtain the projection image data matrix, the grid point geographic latitude and longitude data matrix and Grid point center geographic longitude and latitude data matrix. In this method, the time series of observation images are projected into the same grid of the reference sphere, and the obtained projection images truly and accurately describe the spatial distribution of the observation objects.

Description

technical field [0001] The invention belongs to the technical field of space remote sensing detection, and in particular relates to a disk projection and splicing method of large field of view space earth observation images. Background technique [0002] The ionosphere refers to the atmosphere 60km to 1000km above the earth's surface. Its main components include electrons, oxygen ions (accounting for more than 80%), hydrogen ions, helium ions and other trace heavy ions. The ion components are mainly composed of ultraviolet and X in the sun. Radiation-induced control of photochemical processes is generally electrically neutral. The main characteristics of the ionosphere are reflection, scattering, absorption and refraction of radio waves passing through the ionosphere. Changes in the ionosphere will affect radio waves propagating in the ionosphere, thereby affecting ground communications, satellite communications, and satellite navigation. Under the action of solar radiatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/00G06T3/40
CPCG06T3/4038G06T3/08
Inventor 何飞陈波
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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