Hollowing-out in the center of local city is progressing because of the depopulation and the population outflow to the periphery of the city and there are many vacant lots such as parking or that is not used. Connected vacant lots are appeared according to the increase of vacant lots and there are relationship with adjacent building. And the combination forms the sparse urban environment in local cities. Accordingly, the aim of this paper is to clarify the composition of connected vacant lots in the center of local city of Utsunomiya, Tochigi prefecture by considering the configuration of them and adjacent building. It is meaningful in considering the way urban landscape with vacant lots and the way the building is built.
Firstly, the configuration of connected vacant lots is analyzed through the number of adjacent road and polygonal vertexes. As a result the characteristics of the configuration of vacant lots such as the characteristic that corner plots in the block, the connection of faced roads and fragmentation of townscape were analyzed by the number of adjacent roads. Also the four patterns of connected vacant lots were led by the combination of the vertexes in the side of buildings. According to these points it is found that there is the tendency that if the number of adjacent roads is very small, the number of the vertex decreases and the form of connected vacant lots becomes simpler, and if the number of adjacent roads is large, the number of vertex increases and the form of connected vacant lots becomes more complicated that contains the land of irregular shape.
Secondly the elements of adjacent building are analyzed and it is also considered whether these elements are settled up assuming vacant lots exist. Firstly, the combination of low and middle height consists the most of part when the combination of the height of the buildings is analyzed. Also the boundary elements such as pilotis , gardens, or balconies are analyzed. As a result it was found that the boundary elements of the buildings and external spaces are appeared as the part of the townscape because of the emergence of vacant lots and there is the tendency that when the new building is built assuming vacant lots exist, the spatially continuous elements such as pilotis or balconies are settled up in the border between vacant lots and the building.
Finally, the characteristics according to the configuration of vacant lots such as the characteristic of connected vacant lots with simple configuration that face large-scaled building, simple configuration that face contrastive elevation surface of the low building and complicated configuration that have the continuity by the opening and the pilotis of middle-to-low building are revealed as the characteristics of the typical composition that has the common combination of the configuration patterns of connected vacant lots and the elements of adjacent buildings and the context of the emergence.
From the above result, it was clarified that the relation between vacant lots and buildings is produced depending on the configuration of connected vacant lots in the city block of local city. It shows that the urban environment that is particular to local city is formed and it is considered that it gives effective view point when the use and application of connected vacant lots is examined by the side of configuration and the element of adjacent building or when the way to build the building that faces vacant lots is examined.