KUON GEO › For developers
Nine endpoints, open to any origin. No key. No account. No quota page. No card on file. Everything returns JSON except the badge, which returns SVG. What you get is measurement, with its source named.
Open any example below in a browser tab. That is the whole onboarding.
/api/elevation?lat=35.3606&lon=138.7274 RTK base stations /api/bases Network history /api/bases/history Station badge /api/stations/badge?id=AgPartner_2 Geoid height /api/geoid?lat=35.3606&lon=138.7274 Earthquakes /api/quakes Aurora forecast /api/aurora Mars weather /api/mars/weather Pulse index /api/pulse?m=2026-08 MCP endpoint (for AI agents) /mcp The archive (public ledger) /api/archive Here, now (Japan) /api/here?lat=42.924&lon=143.196&lang=en Base URL: https://kuongeo.com
GET /api/elevation?lat=&lon= Cache: 24 h Height for any point on Earth. Land from satellite radar and national surveys, sea from GEBCO soundings. The response carries the pixel size, so you know it is a representative height and not a summit.
Returns elevation_m, pixel_size_m, zoom, source, note, attribution
GET /api/bases Cache: 2 min Every community RTK base station we track, with its caster, port, mountpoint, position, RTCM content and whether it needs a login. Polled every ten minutes since 3 July 2026.
Returns polled, bases[]: m, host, port, lat, lon, c, f, det, auth, fee, p30, up, ago
GET /api/bases/history Cache: 10 min Daily count of stations and polls across the whole network since the first day of recording. Use it to see how the community network is holding up over time.
Returns start, polled, total, days[]: day, stations, polls
GET /api/stations/badge?id= Cache: 10 min A live SVG badge for one station. Station owners embed it in a page or a README.
Returns image/svg+xml
GET /api/geoid?lat=&lon= Cache: 30 d Geoid height for a point, so you can turn an ellipsoidal height into an elevation. Japan uses the GSI Geoid 2024 model.
Returns geoid, model, src
GET /api/quakes Cache: 5 min Recent earthquakes worldwide as GeoJSON, with magnitude, depth, place and age in hours.
Returns GeoJSON FeatureCollection: m, p, t, ageh, d, s, i
GET /api/aurora Cache: 30 min The NOAA OVATION grid: probability of visible aurora per one degree cell, about thirty minutes ahead.
Returns Observation Time, Forecast Time, coordinates[]: lon, lat, aurora
GET /api/mars/weather Cache: 3 h Measurements from Curiosity REMS at Gale Crater: air temperature, ground temperature, pressure, sunrise and sunset, by sol.
Returns station, source, sols[]: date, sol, ls, min, max, p, sky, uv, rise, set
GET /api/pulse?m=YYYY-MM Cache: 5 min Our own hourly index that puts space weather and RTK network uptime on the same row, so the two can be compared directly. Derived scalars; the raw archive stays unmodified.
Returns month, rows[]: t, kp, xray_flux, flare_class, aurora_cells, sw_speed, bz, rtk_up, rtk_total
GET /mcp (POST, JSON-RPC 2.0) Cache: no-store A Model Context Protocol server over plain HTTP JSON-RPC, no key: point your agent at https://kuongeo.com/mcp and it gets five tools: here (warnings, observation, hazards, RTK and prices for a point in Japan), place (municipality facts by 5-digit code), rtk_bases_near, kurashigram_prices and gnss_in_japan. GET /mcp returns a description. Values carry their source and time; warnings are relayed from JMA, not issued here.
Returns tools: here, place, rtk_bases_near, kurashigram_prices, gnss_in_japan (initialize / tools/list / tools/call / ping)
GET /api/archive Cache: 10 min (rebuilt hourly) What KUON GEO has been recording, since when, how often and how many objects: the community RTK bases polled every 10 minutes since 3 July 2026, JMA warnings, AMeDAS, WBGT, space weather, bear sightings, GNSS interference, orbital elements, and kurashigram's daily price series. Counted every hour from the storage itself (object listings); first and latest upload times, counts, sizes and measured per-day rates. Nothing estimated. Human page at /archive (Japanese at /ja/archive). Monthly snapshots are deposited on Zenodo with DOI 10.5281/zenodo.22064426.
Returns updated, sets{<id>: count, bytes, first, last, perDay}, bases{stations, polledAt, since, cadenceMinutes}, kurashigram{furusato, cost, nichiyo}, places
GET /api/here?lat=&lon=&lang=en Cache: inner 5 min to 1 d One call for one point in Japan: the municipality and its 5-digit code, current JMA warnings and advisories with English names, the nearest AMeDAS observation, earthquakes within 300 km, elevation, the nearest free RTK base, and furusato-nozei prices for that municipality from kurashigram.com. Built for people living in Japan and the assistants that answer them. Warnings are relayed from JMA, not issued here.
Returns municipality{code,name,enName,pref}, jma{areas}, warnings{active[]: code,level,name,enName,status,statusEn}, observation{stations[]: temp,humidity,precipitation1h,wind,...}, earthquakes{recent[]}, hazards{flood{inZone,depth}, tsunami{inZone,depth}, stormSurge{inZone,depth}, landslide{inZone,special,zones}}, heat{wbgt,level,station}, history{warnings{daysWithAny,kinds[],since}, heat{daysDanger31,daysSevere28,max,since}}, elevation{m}, rtk{nearestKm,near[]}, prices{count,top[],url}, cost{city,basis,items[]: name,nameEn,unit,price,month,changePct}, notices, sources
The elevation of Mount Fuji, from a terminal and from a page.
curl "https://kuongeo.com/api/elevation?lat=35.3606&lon=138.7274"const r = await fetch("https://kuongeo.com/api/elevation?lat=35.3606&lon=138.7274");
const { elevation_m, pixel_size_m } = await r.json(); // 3753, 15.6Not everything here is an API. The converters run entirely on your machine: the file never leaves it, and there is nothing to sign up for.
GNSS tools: RINEX, Hatanaka, QC, NMEA / ubx / GPX / KML / GeoJSON / CSV, coordinates and geoid →
CAD tools: open, compare and batch-read DXF and SXF drawings, fully client-side →
Three routes exist on this site but are not published for third parties. The upstream terms bind us, and passing them on to you would break them.
Free to use, including commercially. Name the upstream source shown in the response, and a link back to kuongeo.com is welcome. Sources, licences, cadence and method are all listed on the data page.
If you need a cut of this data that does not exist yet, write to us. We keep the raw originals, so a new view is often just a matter of shaping what is already recorded.