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Base registry for address

Base registry for address is a database of addresses and locations that can be used by anyone for free as a base registry.

Background of Efforts

Address and location information is used as an item in many ledgers in the public and private sectors, such as the addresses of individuals and the locations of corporations and public facilities. The address and location are structured as shown in Fig. 1, but town / village information and residential indication information are managed separately by municipalities and parcel numbers are managed separately by registry offices, so the administration cannot centrally manage standard addresses and locations. In addition, the hierarchical structure of address and location notation that is generally circulated varies depending on the area, and there are many special cases, which makes it difficult to make a data connections using an address as a key. In Digital Agency, we are promoting a data maintenance of the address and location as a base registry for address.

Figure 1
Figure showing addresses for which residential indication is implemented and addresses for which residential indication is not implemented.

Overview of Efforts

In fiscal 2021 (2021), we developed the initial database using existing addresses and locations held by the government (see Fig. 2), and developed the functions necessary to operate and manage the developed initial database (see Fig. 3). The developed initial database is positioned as a test-published version developed by Digital Agency, and is posted on the registry catalog public website as CSV data for each local government, and is widely released to the public as open data.

Figure 2
An explanatory diagram of the initial master data maintenance using the existing address and location information held by the government. The master data is created by combining and normalizing the information contained in the reference source data such as the Electronic National Basic Map containing the place name information and the lot number area information. The prepared initial master data is accumulated in the
Figure 3
Explanatory diagram on the development of functions necessary for operating and managing the developed initial master data. The

There were various Issue left for the initial data to be used as address and location data. We are currently working on responding to these Issue (see Table 1). In response to this Issue response, we have updated and posted a version with finalized specifications for the data format and data manual (to be released later). (See Related Information.) In addition, we have started disclosing the actual disclosed data in the form of a version with finalized specifications since the end of fiscal 2023 (2023).

Table 1

Issue at early data maintenanceResponseResponse period
Shortage and fluctuation of town lettersComparison with information held and managed by local government and reflection of the results of verificationWe will respond by the end of fiscal 2024 (fiscal 2024) and reflect and disclose it in the database.
Indication of residence Omission of local governmentConfirm whether or not residence indication has been implemented in local government and reflect the results of the confirmation
Non-Reflection of Private Character Records from real estate registryMaintenance of a list of character identification and degeneracyReflection and disclosure in the database
The same string of town letters within the same local governmentSystem modification to be able to respond
Kyoto Street names not supportedReceived data from Kyoto City, and data maintenance and system renovation
There are few postal codes (about 15%).Linkage was performed and 95% linkage was performed.
Lot number not yet supportedDevelopment of lot numbers from maps kept by registry offices

In addition, base registry for address has stipulated that "the code value of the town character ID specified in the base registry for address' Town Character Master Data Set' developed by Digital Agency shall be set" in the data item "Address _ Town Character Code" of each system in local governments Information Systems Data Requirements and Cooperation Requirements . Therefore, we plan to collect information from local government and develop a database for the town character data of base registry for address during fiscal 2024 (2024), and after twenty twenty-five (twenty twenty-five), we plan to collect and provide updated information from local government as needed to keep the data up to date.

Historical information