干旱区生态环境知识资源中心

We have long observed the changes of the Dalian areas using remotely sensed image time series from a poit of view of human activities. We employ Landsat TM arid. ETM+ data. to evaluate quantitatively the rate of progress due to its modernization in connection with weather and geographical conditions since such a research is still in an early stage of its development. The analysis by unsupervised classification techniques indicates a steady increase of land area and a steady decrease of vegetation in. the Dalian areas irrespective of the difference of the methods. These facts show that the present approach gives us a measure of human activities.