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

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...

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