Abstract
Bio-environmental quality of the area is possible to be measured from the natural condition of environment which are represented by vegetation growth, as well as from the coverage of bare soils and artificial structures, both being the results of human exploitation activities.
One hundred km area of Tokyo Metropolitan Region was classified into six stages by using ERTS-A Data (Nov. 26, 1972) ; classification of environmental quality was made from the proportion of light values of Bands 6 and 7, reflected from vegetation foliages, to those of Bands 4 and 5, reflected from bare soils and artificial structures. For these purposes, the Multi-Data-Color-System (NAC Inc., Tokyo, Japan) was used for imaginary and area measuration. The environmental quality stages of each class was confirmed by color-infrared air photo and thermal mapping that cover the same area.
The environmental quality of the region was measured effectively as follows: 1) Contributable area for environmental quality with conserving natural conditions (27% of the total area), 2) Environmental balanced area (49%), 3) Decreased purification power area (13 %), 4) Urban area (5.3%) and 5) Dense urban area (2.9%) . In addition, the distribution of new developing area of 482 km2 was mapped.
From above results, in the desely-urbanized area it must be necessary to construct green area of about 48 km2 for the conservation of environmental quality in such area.
In order to promote the accuracy and effectiveness of observations, it is indispensable to make more continuous observations for grasping the seasonal changes of environmental quality and to develop the fundamental information system works.
