Using building and topographic data of gis, development of the tool for confirming the visible area in large scale urban space

Many tall buildings are built and changing the view of the city in Tokyo. But the research of the view in large city area is difficult because it is difficult to reconstruct the city view in computer graphics with the existent software, and more diffi cult to measure the change of the urban view quantitatively in real perspectives. The data of GIS is accurate geographic data. It includes the fl oor of building, so using such data, we developed the new program that calculate the visible area of landscape elements using building and topographic data of GIS.