As used in scale transformation for changing spatial features

incremental generalization technology is one of the main aspects of the multi-scale data propagating updating process. After analyzing the domestic and international research

an incremental generalization algorithm based on gradually expanding the influencing domain is proposed

which consists of the following steps: first

the processed area is divided into parts using hierarchy technique; second

the changed feature and it surroundings that are influencing the features are detected

so as to generalize both of them with correct generalization operations according to the area characteristics; third

expanding the influencing domain of the generalized features so as to detect new corresponding features

and stopping the circles until no influencing feature is detected. Examples illustrate that the method described in this paper is more effective for scale transformation and updating large scale maps.