Abstract
The way of human existence on the earth is largely influenced by the changes in earth environment and how to manage and conserve it is very important to human beings. Recently, however, the earth environment is destroyed by El Nino phenomena, desertification, greenhouse effect, destruction of ozone layer, acid rain, etc. Then the investigation and research of the earth environment by remote sensing technology are attracting world attention. It is also applied to the research of vegetation (agriculture and forest), ocean land use, civil engineering, disaster prevention, atmosphere, geographical information, etc. A method to derive vegetation indices used to know activation of green vegetation is introduced. These indices are also used to detect desertification phenomena. From the viewpoint of environment, human beings living in natural environment must adapt themselves to the environment without changing it.
