Abstract:

A method is provided to monitor the changes of area covered by vegetation with time on the regional scale by using meteorological satellite images. The images, which are corrected by BareSand Soil Line, are used to get NDVI that indicates the vigor and amounts of vegetation. A new method, which is called Equal Area Method, is given to calculate the area of oasis in different years,and is applied to Ejina oasis.It is shown that the area of this oasis has decreased in recent 14 years.

Key words: oasis, remote sensing, equal area correction