SPOT地面场定标与星上定标结果的比较分析

田庆久; 郑兰芬; 童庆禧

doi:10.11834/jrs.19980103

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SPOT地面场定标与星上定标结果的比较分析
Comparison and Analysis for In-Flight Calibration of SPOTBased on Methods of Test Site and On-Boarding Calibration
1998年第1期
纸质出版：1998
DOI： 10.11834/jrs.19980103
稿件说明：

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[1]田庆久,郑兰芬,童庆禧.SPOT地面场定标与星上定标结果的比较分析[J].遥感学报,1998(01):13-18. DOI： 10.11834/jrs.19980103.

Tian Qingjiu Zheng Lanfen Tong Qingxi. Comparison and Analysis for In-Flight Calibration of SPOTBased on Methods of Test Site and On-Boarding Calibration[J]. Journal of Remote Sensing, 1998, (1). DOI： 10.11834/jrs.19980103.

摘要

本文研究是在遥感辐射定标场选择的基础。利用６Ｓ大气辐射传输模型进行ＳＰＯＴ遥感数据的定标和地物的光谱反射率反演，即在遥感器飞越辐射定标场上空，在定标场选择若干像元区，测量遥感器对应的各波段地物的光谱反射率和大气光谱参量，并利用大气辐射传输模型给出遥感器人瞳处各光谱带的辐射亮度，最后确定它与遥感器对应输出的数字量化的数量关系，求解定标系数。然后，对相应的研究训练区的遥感数据进行大气辐射校正，进而反演训练区内的地物光谱反射率。最后，通过将反演值与实地测量的地物光谱反射率进行对比分析，来估算定标不确定度，并比较说明两种不同方式定标差异及优势和限制。

Abstract

This research was for in-flight SPOT calibration conducted in July

1995. SPOT HRV was calibrated by La Crau test site and on-boarding calibration methods. 65 CODE was used for test site calibration and reflectance retrieval of some ground targets. The calibration coefficient A & A’was calculated. The calibration results based on both methods were compared and analysed. The analysis results have shown that: （ 1 ） calibration precision based on test site is higher than that obtained from on-boarding calihration; （2） 65 CODE is practical and fast for calibration and reflectance retrieval; （3） there are system errors in both methods; （4） the uncertainty of calibration coefficients can be estimated by the retrieved reflectance

of some targets; （5） the reliability of calibration result is proved by the consistence in calibration precision range for both or more independent methods: （6） the calibration result difference for different calibration methods can be used to diagnose the sensor state and to correct inadequate method or some mistakes

and also to guide the applications.