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[E-5 Mapping of Vegetation Distribution and Vegetation Index Distribution in South East Asia Region Using NOAA AVHRR(LAC) Imageries]

[Contact Person]

Yoshifumi Yasuoka
Head, Information Processing and Analysis Section
Social and Environmental Systems Division
National Institute for Environmental Studies
Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305, Japan
Phone +81-298-51-6111(Ext.415), Fax +81-298-51-4732

[Total Budget for FY1991-1993]

55,687,000 Yen (FY1993 19,152,000 Yen)

[Abstract]

　Several methodological developments, eg., geometric and radiometric corrections, were made for deriving accurate vegetation distribution and vegetation index distribution maps of South East Asia from NOAA AVHRR(LAC) imageries, and for revealing their temporal changes.
　The geometrical improvement was achieved by applying colinearity condition in photogrammetry and data of ground control points(GCPs) to estimation of parameters which determines a correct position and attitude of a satellite. The method enables to correct distortion of imageries with fewer numbers of GCPs than those required in conventional methods. An additional geometric correction was incorporated by referring to the digital elevation model.
　The radiometric intensity of imageries acquired at different time was adjusted in terms of the zenith angle of the sun and atmospheric condition such as precipitable water content to mosaic them without discontinuity. A new algorithm was, moreover, developed to locate a corresponding point of two images automatically by comparing their spectral characteristics.
　Mosaiced satellite images and vegetation index images of 1985, 1989 and 1992 were produced from NOAA AVHRR(LAC) imageries covering South East Asian region with 1km spatial resolution. Differences between two of the vegetation index images were mapped to evaluate landcover changes during the periods.

[Key Words]

Remote Sensing, Vegetation Index, Mosaic, NOAA, South East Asia