Geometric calibration method of airborne hyperspectral instrument and its demonstration application in coastal airborne remote sensing survey

doi:10.6046/gtzyyg.2020.01.09

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Abstract

When coastal hyperspectral remote sensing measurement and survey are conducted, the water surface cannot be used for ground control point measurement, and hence the accurate external orientation element of the data cannot be obtained by the traditional aerial triangulation method. Therefore, how to ensure the geometric accuracy of the aerial remote sensing data is one of the key problems in measurement. In this study, the authors summarized and analyzed the geometrical correction principle and model characteristics of CASI 1500H push-broom airborne hyperspectral instrument and designed a set of geometric calibration schemes for this system. The calibration results show that the geometric accuracy of CASI 1500H hyperspectral image can still be significantly improved without control points. Using this geometric calibration method, the authors acquired CASI airborne hyperspectral data of Dajin Island and its surrounding waters. Based on these data, the authors retrieved the suspended sediment concentration in the surrounding waters of Dajin Island, and the overall accuracy was better than 70%, which can meet the need of coastal airborne remote sensing survey.

Keywords CASI 1500H hypersectral image geometric calibration coastal zone hyperspectral survey suspended sediment concentration

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Issue Date: 14 March 2020

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	Yachao HAN
	Qi LI
	Yongjun ZHANG
	Zihong GAO
	Dachang YANG
	Jie CHEN

Cite this article:

Yachao HAN,Qi LI,Yongjun ZHANG, et al. Geometric calibration method of airborne hyperspectral instrument and its demonstration application in coastal airborne remote sensing survey[J]. Remote Sensing for Land & Resources, 2020, 32(1): 60-65.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.01.09 OR https://www.gtzyyg.com/EN/Y2020/V32/I1/60

Fig.1 Schematic diagram of the spatial positional relationship of the components of the positioning and orientation GPS/IMU system

Fig.2 Schematic diagram of push-broom imaging collinear equation

Tab.1 Calibration field requirements

Fig.3 CASI calibration field route and ground control point distribution

Tab.2 Overall adjustment accuracy

Tab.3 CASI 1500H geometric calibration results

Fig.4 Comparison of geometric accuracy of typical objects

Fig.5 Suspended sediment concentration of the Dajin Island surrounding water

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