Abstract: Interpretation of Remote Sensing image is the frontier technology in Iconology, which is of interdisciplinary meaning and good effect by using it to do the research on city environment problem. This paper studies the position, form and structure of city ecological tunnels by using the satellite image and does the case study of Beijing city. It also uses the indices of NDVI and surface brightness temperature deduced by satellite image to analyze the function of ecological tunnels. It is proved that Remote Sensing can be used into precise analysis of city environment and is the way for the application of Graphics in Geography and Urban Planning.

Key words: engineering graphics, ecological tunnel, image interpretation, vegetation index