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VISUALIZING THE LANDSCAPE OF OLD-TIME TOKYO ( EDO CITY )

Historical maps are precious materials, which show various spatial distribution of land use, streets and so on of the historical importance at the time the maps were produced. They may be a dependable source of information regarding concepts of city planning of the past. In analysis of historical maps, the most practical method is to compare them with the present ones, for instance, by overlaying them. However, the low precision, in the geometrical sense, of the historical maps makes the task of comparison very difficult. It is important to point out here that research on rubber sheeting, that is, geometric correction of maps for conflation of maps from different sources has recently made much progress. Using these procedures, geometric correction of historical maps should become possible. We address applied research on such an incorporation of historical maps into GIS. We performed rubbersheeting of some historical maps to present map coordinate system in Japan by using the piecewise geometric transformation based on TIN and planar affine transformation. We can produce the bird's-eye view of old city by relating historical maps with the digital elevation model. Our ultimate goal is to reproduce landscape in old city from any viewpoint and any direction and to explore the past concepts of city planning and urban developments. Age-old historical maps, as well as present maps and geo-information, can be important elements of GIS if they are geometrically corrected to the present coordinate system.