Atmospheric correction of HJ-1 A/B CCD over land: Land surface reflectance calculation for geographical information product

doi:10.1007/s11442-014-1140-0

Abstract

Abstract:

This paper proposed a method to retrieve the land surface reflectance from the HJ-1A/B CCD data. The aerosol optical depth (AOD), the most important factor affecting the atmospheric correction of CCD images at all bands, is proposed to retrieve from the CCD imagery by the approach of dense dark vegetation (DDV) method. A look-up table in terms of the transmittances, the path radiances and the atmospheric spherical albedo as functions of the AOD was established for a variety of sun-sensor geometry and aerosol loadings. The atmospheric correction is then achieved with the look-up table and the MODIS surface reflectance output (MOD09) as the priori datasets. Based on the retrieved AOD and the look-up table of atmospheric correction coefficients, the land surface reflectance was retrieved for the HJ-1A/B data according to the atmospheric radiative transfer equation. Some in-situ measurement Data for Yanzhou of Shandong province in East China and MODIS land surface reflectance products MOD09 are used to preliminarily validate the proposed method. The results show that the proposed method can remove effectively the atmospheric contributions, and the overall accuracy of the retrieval land surface reflectance can be improved substantially.

Key words: atmospheric correction, HJ-1 A/B CCD, aerosol optical depth, land surface reflectance, 6S

Qiaoyan FU, Xiangjun MIN, Lin SUN, Shengfang MA. Atmospheric correction of HJ-1 A/B CCD over land: Land surface reflectance calculation for geographical information product[J].Journal of Geographical Sciences, 2014, 24(6): 1083-1094.

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Spatial resolution	30 m (in nadir)
Swath width	360 km (CCD*2≥700 km)
Aspect angle	31°
Revisit period	2 days
Spectral resolution	Band 1 (0.43-0.52 µm) Band 2 (0.52-0.60 µm) Band 3 (0.63-0.69 µm) Band 4 (0.76-0.90 µm)

Date	Station of AERONET	AOD for AERONET	AOD for retrieval	Absolute error
2010.08.02	Nanjing, Jiangsu province	0.60	0.638	0.038
2010.07.30	Yuzhong, Gansu province	0.52	0.495	0.025
2009.05.31	Yuzhong, Gansu province	0.26	0.265	0.005
2009.10.16	Yuzhong, Gansu province	0.17	0.189	0.019
2010.08.03	Taipei, Taiwan area	0.25	0.255	0.005
2010.08.03	Chen-Kung_Univ, Taiwan	0.10	0.151	0.051

HJ-1A/1B CCD band	Reflectance of HJ-1A/1B CCD	MODIS Band	Reflectance of MODIS
CCD1
Band 1	0.0570	Band 3	0.0462
Band 2	0.0821	Band 4	0.0843
Band 3	0.1202	Band 1	0.0958
Band 4	0.2066	Band 2	0.2297
CCD2
Band 1	0.2069	Band 3	0.1551
Band 2	0.2468	Band 4	0.2203
Band 3	0.2854	Band 1	0.2530
Band 4	0.2803	Band 2	0.2693