AN EVALUATION OF ADEOS-II GLI LAND PRODUCTS FOR GLOBAL LAND SURFACE 
MONITORING 
Hirokazu YAMAMOTO*, Toshiaki HASHIMOTO*, 
Yasushi MITOMI®, Hiroki YOSHIOKAS, 
Yoshiaki HONDA? and Tamotsu IGARASHI? 
a JAXA/EORC, 1-8-10-X22, Harumi, Chuo-Ku, Tokyo, JAPAN 104-6023 — (kath,hashi,igarashi)@eorc.jaxa.jp 
*RESTEC, 1-8-10-X21, Harumi, Chuo-Ku, Tokyo, JAPAN 104-6021 — mitomi Grestec.or.jp 
“Meijo Univ., 4-3-3, Nijigaoka, Kani, Gifu, JAPAN 509-0261 — yoshioka Q urban.meijo-u.ac.jp 
“Chiba Univ., 1—33, Yoyoi-cho, Inage-ku, Chiba, JAPAN 263-8522 — yhonda@cr.chiba-u.jp 
Commission VII, WG VII/6 
KEY WORDS: ADEOS-1I/GLI, Land Higher Products, Geometric Correction, Composite, Atmospheric Correction, Vegetation In- 
dices. 
ABSTRACT 
The Japan Aerospace Exploration Agency (JAXA, former NASDA) has successfully launched a new Advanced Earth Orbiting Satellite 
(ADEOS II) aboard an H-2A booster on December 14, 2002. Unfortunately, the operation of ADEOS-II satellite was stopped in the end 
of October. ADEOS II is designed to monitor global climactic change through researches of the Earth’s environment. Four disciplinary 
components of the Earth system, namely atmosphere, ocean, cryosphere, and land, cover the monitoring activities with five sensors 
onboard the satellite including the Global Imager (GLI). All the five sensors were working normally, and had acquired the first light 
images as a part of the initial function verification test. 
GLI allows us to observe vegetation status in the two different resolutions simultaneously (1km and 250m). There are four GLI Level-2 
land products from these channels; those are PGCP (parameter of geometric corrected image), L2A_LC (TOA reflectance), AC_LC 
(reflectance after atmospheric correction), and VGI (NDVI and EVI). The VGI products are expected to be a useful data set for global 
mapping of vegetation biophysical parameters such as LAI fAPAR, NPP and so on. This paper shows ADEOS-II GLI land processing 
algorithm and evaluation of land products. 
1 INTRODUCTION 
Vegetation plays an important role of the carbon cycle on the 
earth. Carbon is the key element in all livings including human, 
and this element is stored in plants and trees. Carbon cycle is 
associated with global warming. Therefore, it is needed for veg- 
etation monitoring to understand global warming. 
The Global Imager (GLI) onboarded the ADEOS-II satellite was 
launched successfully on December 14, 2002. GLI is an optical 
sensor for the purpose of global and frequent observations of ra- 
diation reflected by land, ocean, ice/snow and atmosphere. The 
one of objectives of ADEOS-II mission is to research and esti- 
mate quantatively plant biomass and primary productivity. GLI 
was expected to give us the great contribution for understanding 
carbon cycle. Unfortunately, the operation of ADEOS-II satel- 
lite was stopped in the end of October, however, GLI has been 
able to obtain data during the important period in the northern 
hemisphere. Therefore, the collected GLI data have capability of 
potential for detecting of vegetation dynamics. 
GLI has 23 channels in visible and near-infrared region (VNIR), 
five channels in short wavelength infrared. region (SWIR), and 
seven channel in middle and thermal infrared (MTIR). Spatial 
resolution of the sensor is 1km at nadir excepts 6 channels in 
VNIR regions which have 250 m resolutions. Single mechanical 
scan covers 12 picture elements (12 km) along the forward di- 
rection and 1600 km along the cross-track. Total of 21 channels 
are dedicated for land observations in the two spatial resolutions; 
channels 1, 5, 8, 13, 15, 17, 19, 24, 26, 27, 30, 31, 34, 35, and 36 
are for 1 km resolution, and channels 20, 21, 22, 23, 28, and 29 
are for 250 m resolution. Thus, GLI allows us to observe vegeta- 
tion status in the two different resolutions simultaneously. 
2 OBJECTIVE 
GLI L1 and L2 products were released for public user on Dec.24 
2003. GLI PI/CI researchers can obtain these products free of 
charge. Public users are also able to be provided with products 
with lower price. GLI higher level processed data are four kinds 
of products; those are PGCP(precise geometric correction param- 
eter), L2A_LC (TOA reflectance), ACLC (reflectance after atmo- 
spheric correction), and VGI (NDVI and EVI). These products 
should be validated and should be more accurate products. The 
objective of this study is to show the algorithm of GLI land higher 
products and to evaluate these processed higher products. 
3 GLI HIGHER LEVEL PROCESSING 
GLI higher level processing is mainly Precise Geometric Cor- 
rection, Composite, Atmospheric Correction, and Vegetation In- 
dex. GLI 1km higher level standard products are provided by 
JAXA. 250m processing algorithm is under development, and 
these products will be research products. The official standard 
product of GLI 250m is Level 1. GLI 250m higher algorithm 
will be a little different from GLI 1km algorithm. The detail al- 
gorithm is described in the following sections. Table.1 shows 
the characteristics of GLI land channels, and Figure. is relative 
spectral response. GLI land channels are selected on the proper 
positions of various spectral reflectances over land. 
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