ANALYSIS OF BUILDING STOCK CHANGE IN MAJOR CITIES BASED ON THE CITY PLANNING BASIC SURVEYS BY CREATING TIME-SERIES PANEL DATA OF BUILDINGS

Abstract

 The purpose of this study is, in the first place, to construct comprehensive and chronological panel datasets in the six major cities of Japan and finally to clarify the building metabolism of the cities using the datasets. The study was performed according to the following procedure.

 

 ・ By overlaying the GIS data created by the basic surveys on city planning between different years, building identification judgments were made, and panel data that show the status of “survival”, “new construction”, and “loss” during the observation period were created.

 ・ The deemed building area and gross floor area of each building was calculated from the building’s polygon area and the number of floors above ground. In order to approximate these values to actual ones, we created an estimation models using collected information on the outlines of the actual building plans, corrected them, and completed panel datasets for analysis

 ・ In each city, the amount of building stock was increasing both in number and gross floor area. By the type of building use, apartment house and offices have a large gross floor area per building and tend to be getting large, while detached house is becoming smaller on a nationwide scale as they are newly supplied

 ・ We looked at the geographical distribution of newly built buildings in Tokyo, Yokohama, and Nagoya, where building metabolism was particularly active. The results showed that new detached houses were located on the periphery of the city, new apartment houses were located in areas with good access to the city center, such as along railway lines, and new offices were mainly provided in existing office areas. As a whole, it can be seen that the size of the newly constructed building is particularly large in the center of the city, and the offices account for major part of them. This trend was common to all cities