Block Adjustment Method
for Mosaicing a Large Number of Satellite Image Data
Koki Iwao, Ryosuke Shibasaki and Masataka Takagi
Institute of Industrial Science,
The University of Tokyo.
7-22, Roppongi, Minato-ku, Tokyo 106, Japan
Tel. +81-3-3402-6231 ext.2563
Fax. +81-3-3479-2762
E-mail : iwao@shunji.iis.u-tokyo.ac.jp
Abstract
This paper focused on the development of geometric correction method for mosaicing a large number of satellite data under the auspices of Land Use/Cover Change Study of South-East Asia(LUCS-ASIA).
In this project, we have to geometrically correct more than one thousand Satellite(Mainly Landsat TM & MSS, MOS-1 MESSER) scenes for three different years, i.e.1970's, 1980's and 1990's of South-East Asian region. If these images are geo-corded separately one by one, geometric distortions are likely to occur between different images.And it is not always easy to find enough GCPs in every scene. This makes the mosaicing of images labor-depending.In this paper, we propose a method to adjust geometric errors over all images at one time borrowing the idea of block adjustment in photogrammetry. Even if we can not find enough GCP points to one scene, we can adjust geometric errors over all images with the information of tie points between images.
1.Background and Objectives of the Study
Land use changes are becoming an important component for environmental,
studies at all levels -local, regional and global. levels especially in South-East Asian regions. For a proper and complete understanding of the changes that are taking place in land use and their effects on the local, regional and global scales, we need to have a quality database of the landuses -both past and present, to help us in analyzing the changes on the time scale.
The Land Use / Cover Change Stud y of "South-East Asia(LUCS-ASIA) was taken up withan aim to develop uniform and standard timeseries database of the land uses by a core group
among universities/National Institute of environmental Studies (NIES) in Japan under Fig.l Map Illustrating the
the cooperation with research institutes/universities and governmental organizations in South-East Asian countries.
Fig.1 Map Illustrating the 100 Landsat Scenes
In this project, we have three main aims i.e.
- To generate time series mosaicing images around South-East Asia
- To generate land use/ cover time-series data set using satellite data
- To develop comprehensive GIS database
Up to now ,we already got more than 100-Landsat TM images for 1990's(Fig.l} and more
than 400 MOS-l(MSSR} images of this area.
Here we focused on the method for mosaicing such a large number of data.
