A study on the revision of floorage of business use buildings estimated based on the Tokyo Metropolitan Government GIS building data

Abstract

This study aims at improvement in the accuracy of floorage of business use buildings which was estimated by Tokyo Metropolitan Government GIS (TMG-GIS) building data. To this end, this article clarified the problems in applying the revision formula proposed by Ohba (2000) to floorage estimations using TMG-GIS, and suggested its alternative. As the control to floorage estimated by TMG-GIS, we used the digital map of fixed property tax (FPT) in M city of Tama area of Tokyo.
First, we clarified the following three problems in formulating floorage revision formula for TMG-GIS: 1) the consistency of business building usage between TMG-GIS and FPT; 2) the difference of structure classification between TMG-GIS and FPT; 3) the effect of the conversional coefficient of floorage in TMG-GIS. Second, we fomulated the revision formula by applying regression analysis to the buildings classified in business usage and structure for floorage by TMG-GIS. Last, we analyzed the effect of building usage mismatching to floorage revision formula.