Matching threshold analysis method for cross radiometric calibration between satellites
A technology of radiation calibration and analysis method, which is applied in the field of matching threshold analysis of interstellar cross radiation calibration, can solve the problems of large number of matching samples, affecting the accuracy of interstellar cross calibration, and low representativeness of matching samples, and achieves Improve calibration accuracy, improve calibration efficiency, and save time
Pending Publication Date: 2021-07-27
NAT SATELLITE METEOROLOGICAL CENT
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[0003] However, due to the unreasonable setting of the matching threshold for cross-calibration between stars, the number of matching samples is too large, the representativeness of matching samples is not strong, and the matching samples cannot meet the calculation requirements of cross-calibration, which directly affects the accuracy of cross-calibration between stars
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[0050] This embodiment provides a specific structure of a matching threshold analysis method for interstellar radiation calibration, such as figure 1 shown, including the following steps:
[0051] S1 Observation file matching: Based on the file matching rules, pair the observation data of the target remote sensor and the reference remote sensor to obtain a time-matched observation file pair;
[0052]S2 pixel spatio-temporal matching: Based on time-matched observation file pairs, use pixel matching rules to achieve the matching of time, space and observation angle of observed pixels, and obtain pixel matching samples;
[0053] S3 data conversion: Based on the spectral response function, data conversion is performed on the pixel matching samples to obtain samples with uniform units that can be directly compared;
[0054] S4 sample filtering: based on the sample filtering threshold, the samples are filtered to obtain samples that can be used for cross-calibration analysis;
[0...
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The invention discloses a matching threshold analysis method for cross radiometric calibration between satellites, and the method comprises the following steps: S1, observation file matching, S2, pixel time-space matching, S3, data conversion, S4, sample filtering, S5, sample accumulation, and S6, quality judgement. The method is suitable for the technical field of cross radiometric calibration.The method comprises the following steps that a matching sample obtained by cross radiation calibration between satellites is analyzed; key element matching thresholds are iterated and adjusted, and reasonable thresholds are determined through matching sample quality judgment, so that a reasonable matching threshold interval and a recommendation threshold list are given according to analysis results and load platform characteristics such as track characteristics, spectrum channels and observation modes of different types of reference remote sensors and target remote sensors; the method can greatly improve the quality of a cross radiation calibration matching sample, thereby improving the calibration precision, effectively saving the time of cross radiation calibration matching calculation, and improving the calibration efficiency.
Description
technical field [0001] The invention belongs to the technical field of cross-radiation calibration, in particular to a matching threshold analysis method for cross-radiation calibration between stars. Background technique [0002] Cross-radiation calibration, that is, to establish the conversion relationship between the sensor channel to be calibrated and the output of the reference sensor channel, is an effective means of on-orbit alternative calibration, which can make full use of multiple data sources to achieve mutual conversion and assimilation of different sensor data Application, that is, using remote sensing instruments with high calibration accuracy as reference standards, selecting data under the same or similar observation conditions, establishing the relationship between the entrance pupil radiance of the reference remote sensing instrument and the measured value of the target remote sensing instrument, and realizing the target remote sensing instrument The calibra...
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IPC IPC(8): G06K9/00G06K9/62
CPCG06V20/194G06V20/13G06F18/22
Inventor 张勇孙凌邱红张鹏徐娜郑鑫
Owner NAT SATELLITE METEOROLOGICAL CENT