A curve-theorem based approach for change detection and its application to Yellow River Delta

A curve-theorem based approach is proposed and is used to handle NDVI data. The curve-theorem based approach includes a general index CD and two nonlinear transformations SAV and CAV. It is applied to Landsat MSS images of the Yellow River Delta, taken on 1 December, 1976 and 3 December, 1988. Results show that CD can describe the general situation of vegetation cover change in the Yellow River Delta and SAV is sensitive to environmental change in rivers and sea, while CAV is sensitive to environmental change in industrial and urban areas.