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Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.4 P.641-646


Refined empirical line method to calibrate IKONOS imagery

Author(s):  Xu Jun-feng, Huang Jing-feng

Affiliation(s):  Institute of Agricultural Remote Sensing and Information Technology, Zhejiang University, Hangzhou 310029, China

Corresponding email(s):   hjf@zju.edu.cn

Key Words:  Calibration, Refined empirical line (REL) method, IKONOS

Xu Jun-feng, Huang Jing-feng. Refined empirical line method to calibrate IKONOS imagery[J]. Journal of Zhejiang University Science A, 2006, 7(4): 641-646.

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author="Xu Jun-feng, Huang Jing-feng",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

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%T Refined empirical line method to calibrate IKONOS imagery
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%A Huang Jing-feng
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%I Zhejiang University Press & Springer
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A1 - Xu Jun-feng
A1 - Huang Jing-feng
J0 - Journal of Zhejiang University Science A
VL - 7
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SP - 641
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2006.A0641

To extract quantitative biophysical parameters such as leaf biomass and leaf chlorophyll concentration from the remotely sensed imagery, the effect of atmospheric attenuation must be removed. The refined empirical line (REL) method was used to calibrate the IKONOS multispectral imagery. The IKONOS digital numbers (DN) were converted to the at-satellite reflectance, then the linear relation between at-satellite reflectance and surface spectral reflectance (ρλ) was derived from six bright targets of known reflectance in the image, and modelled estimates of the image reflectance at ρλ=0. Validation targets were used to test the feasibility of REL method. The mean relative errors between ρλ retrieved from IKONOS image using REL method and ground-measured ρλ were 11%, 13%, 3% and 5% in the IKONOS blue, green, red and near-infrared (NIR) respectively. When dark targets are unavailable or measurement of dark target is inconvenient, the REL method was most crucial for retrieving surface spectral reflectance. The REL offers a simple approach for quantitative retrieval of biophysical parameters from IKONOS imagery.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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