Remote sensing is one means to obtain objective and repetitive information about our fast- changing and endangered environment on a regional and global scale. It has the capability to strengthen our awareness about the present situation on the earth''s surface. Earth observation offers the possibility to gather information for a large variety of application and to describe inter-relationships and consequences of human activities. Observational possibilities and needs are explained and listed.
"Remote sensing of the earth: an introduction", Proc. SPIE 1524, Bioptics: Optics in Biomedicine and Environmental Sciences, (1 March 1992); doi: 10.1117/12.57722; https://doi.org/10.1117/12.57722