Data sources
Last updated: July 16, 2026
BestPlace organizes and displays public data objectively, without scoring or evaluation. The source institution and official URL for each data section is listed below.
Surrounding map
OpenStreetMap (map tiles) + MapLibre GL JS (rendering) + GSI Hazard Map Portal (overlay tiles)
Land prices & real estate
MLIT Real Estate Information Library (Published Land Prices XPT002 / Transaction Prices XIT001)
Condominium market
MLIT Real Estate Information Library (Transaction Prices XIT001 / Land Price Points XPT002) — filtered to second-hand condominiums
Population & households
e-Stat (Portal Site of Official Statistics of Japan) — National Census, town/block-level aggregation
Future population projection
MLIT Real Estate Information Library (500m mesh future population projection XKT013)
Disaster risk
MLIT Real Estate Information Library (Flood XKT026 / Liquefaction XKT025 / Landslide zones XKT029 / Evacuation shelters XGT001 / Disaster history XST001)
School districts & education
MLIT Real Estate Information Library (Elementary district XKT004 / Junior high district XKT005 / Schools XKT006 / Daycare & kindergarten XKT007)
Nearby facilities
OpenStreetMap Overpass API (stations, convenience stores, supermarkets, parks, schools, police boxes)
Medical facilities
MLIT Real Estate Information Library (Medical facilities XKT010: hospitals, clinics, dental clinics)
Road classification
OpenStreetMap Overpass API (major roads within 300m radius classified by highway tag)
Measured traffic volume
MLIT Data Platform — Road Traffic Census (general traffic volume survey GraphQL API)
Geocoding (address to coordinates)
Geospatial Information Authority of Japan (GSI) Address Matching API (JA) / Google Geocoding API (EN)
AI area summary
Anthropic Claude (claude-haiku-4-5) + Web search tool to generate area characteristics (only the address is transmitted; no personal information)
Our data handling policy
- BestPlace does not score, rate, or evaluate areas. We are committed to objectively organizing and displaying public data only.
- Every data point is accompanied by the name of its source institution and an official URL, so that users can judge the reliability of the data themselves.
- For data from the MLIT Real Estate Information Library (reinfolib), BestPlace performs some processing for display purposes, such as converting to per-tsubo prices, calculating change rates, and aggregating nearby transactions. Original data is directly accessible from each source URL.
- The accuracy and recency of the data depend on the publications of each source institution. Please always verify primary sources before making important decisions.