Journal of Geo-information Science >
Using Ground Features to Calculate Band to Band Registration Accuracy Based on CCD Data of HJ-1A/B
Received date: 2013-06-08
Revised date: 2013-09-24
Online published: 2014-03-10
HJ-1A/B satellite, designed for observing the environment of water, atmosphere, and ecosystem, was launched successfully on September 6th, 2008 from Taiyuan Satellite Launching Centre. Its products have been widely used in many application areas, such as agriculture, forestry, land use, ecological environment and natural disasters, and greatly improved the ability of environment and disaster monitoring. There is a 4-band CCD camera boarded on both HJ-1A and HJ-1B platforms with the wavelength range from visible to near-infrared spectrum. Different bands need to be combined together while retrieving the application products. The error of Band-to-Band Registration (BBR) is a significant parameter which can impact the image quality and product accuracy. Therefore, calculating the BBR of CCD is important for enhancement of its usage. In this paper, an approach based on ground features is presented to compute BBR of HJ-1A/B CCD. In our approach, Xin'an reservoir located in Dongying City, Shandong Province is selected as the target area, within which several water and dam strips are interlaced. In satellite images, the responses of water and dam have a strong contrast feature, which forming continuous peaks and troughs. There are three steps in our algorithm. Firstly, we used the reservoir observation images in each band of CCD sensors to extract the pixel reflectance and pixel position to calculate the real position of the ground measurements. There are three procedures in second step, data preprocessing, radiometric calibration, and atmospheric correction. Finally, according to the deviations in the image of each band, the BBR was calculated in both along scan and along track directions. With several study cases, that the BBR of HJ-1A CCD1 in both along track and along scan directions is about 0.2 pixel for all bands except the band 2 whose along track BBR reaches 0.36 pixel and along scan BBR reaches 0.55 pixel; the BBR of HJ-1B for all bands is almost between 0.2 to 0.3 pixel.
Key words： ground features; reflectance accuracy evaluation; BBR; CCD camera; HJ-1A/B
MA Yang, PEI Liang, GU Xingfa, YU Tao, GAO Hailiang, XIE Yong . Using Ground Features to Calculate Band to Band Registration Accuracy Based on CCD Data of HJ-1A/B[J]. Journal of Geo-information Science, 2014 , 16(2) : 290 -298 . DOI: 10.3724/SP.J.1047.2014.00290
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