Most of spatial phenomena like natural vegetation units and land use areas constantly change over time and have uncertainty spatial extents. Till now, a considerable number of data models have been pr
Much data such as geometric image data and drawings have graph structures. Such data are called graph structured data. In order to manage efficiently such graph structured data, we need to analyze and
Recently, new techniques to efficiently manage current and past location information of moving objects have received significant interests in the area of moving object databases and location based se