Method and apparatus for extracting monthly observation data

Abstract

The invention relates to a monthly observation data extraction method and an extraction device. The method comprises the following steps: establishing a row angle / column angle standard data model; Thehemispheric coordinate system is established with the center of mass of the remote sensor as the center of the sphere, the continuous frames of the moon images are collected in real time, the hemispheric coordinate system is loaded on the frames of the moon images in sequence, and the coordinates of the moon positions of the frames of the moon images are extracted. Calculating a moon azimuth angle and a moon zenith angle according to the moon position coordinates in real time, judging whether the moon azimuth angle is within a row angle threshold range and whether the moon zenith angle is within a column angle threshold range in real time, and if so, extracting a moon image frame of the moon position coordinates as an effective moon image frame; Effective moon image frames compose the full moon image data. The method and the device of the invention utilize the angle characteristics of the moon relative to the remote sensor to establish a channel-by-channel row angle / column angle standard data model, theoretically determine the event that the moon enters the cold air field of view, and can accurately identify the situation that the moon enters each channel.

Description

technical field [0001] The invention relates to the technical field of signal and information processing, in particular to a method and device for extracting lunar observation data. Background technique [0002] The quantitative application of remote sensing data is the development trend and direction of the remote sensing field, and the high-precision radiometric calibration of remote sensing data is an important prerequisite for quantitative application. Among the many radiometric calibration methods, for the visible and near-infrared bands, the on-orbit radiometric calibration based on lunar observations has become an important research direction of radiometric calibration in recent years. The moon is the extraterrestrial object with the largest viewing angle except the sun, and the change rate of its albedo is about 10-8 / year. Such stable reflection characteristics make the moon very suitable as a reference source of radiation for satellite solar reflection channels. ...

AI Technical Summary

Problems solved by technology

[0008] The use of statistical features has a relatively large defect: the reason for the change of the cold space counter value is not only the moon entering the field of view of the cold space, transmission errors, abnormal channel detectors, and occasional current noise, etc., can cause changes in the statistical characteristics of the cold space data of the instrument

It is difficult to avoid moon pixel identification errors caused by single-frame multivariate image stripes in existing technologies, especially the pixels on the edge of the moon

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