2021 Fiscal Year Final Research Report

A study of satellite-based mapping of real estate price and its applications

Research Project

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Project/Area Number	19H02256
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 22050:Civil engineering plan and transportation engineering-related
Research Institution	The University of Tokyo
Principal Investigator	Shibasaki Ryosuke 東京大学, 空間情報科学研究センター, 教授 (70206126)
Co-Investigator(Kenkyū-buntansha)	Seetharam KE 東京大学, 空間情報科学研究センター, 客員教授 (10817290)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	衛星画像解析 / 住環境 / 地価 / 大都市 / 途上国 / 深層学習
Outline of Final Research Achievements	Since the Covid-19 has caused major obstacles to the collection of urban land price data in developing countries, we have focused on the advancement of satellite image analysis to obtain detailed urban environmental information from satellite images and clarified the relationship with domestic land price data. We have developed advanced techniques for extracting buildings and detecting the changes using high-resolution imagery, as well as those for automatically extracting slum areas (i.e., areas with significantly low environmental quality and land prices) using mainly medium-resolution satellite imagery. These methods were found to achieve a significant improvement in accuracy. We also obtained a large amount of available land price data in Japan and analyzed the relationship with environmental factors obtained from satellite images. From these results, we have obtained a prospect to estimate land prices in large cities in developing countries from satellite images.
Free Research Field	空間情報科学
Academic Significance and Societal Importance of the Research Achievements	多様な衛星画像を利用して建物の自動抽出や変化の自動検出、あるいは住環境の劣悪な貧困地域の自動抽出など、都市環境の詳細情報を抽出する研究は他に少なく、手法開発研究としても、実証的な意味でも非常に有益な成果が得られた。途上国の都市開発においても、固定資産価値の上昇は、都市の経済成長や都市整備のための公的財源の原資として非常に重要である。資産価値情報を衛星画像などのオープンなデータを用いてある程度推定できるようになれば、長期的には都市財政の安定化や公共サービスの高度化に貢献できる。