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Altimeter Cloud API

Rocketry data you can build on

Verify and look up flights, and get the ground, trees, water, roads, power lines and weather around any launch site. Plain HTTPS, JSON back, and compact binary files for the map data.

Get a free keyTry an endpoint

Free for non-commercial use. No key needed to start.

GET/api/terrain/?lat=52.64&lon=-1.50
{
  "success": true,
  "lat": 52.64, "lon": -1.5,
  "elevation_m": 112.4,
  "has_data": true,
  "datum": "EGM96 mean sea level"
}

Endpoints

LightMediumHeavyUpload & verifyLanding prediction
Your account
My DevicesThe devices on your account, online or not, with firmware and latest flight. Needs your key./api/my_devices/
Flights
CSV VerificationCheck a flight log is genuine and unedited./api/csv_verify/Upload APIVerify a log and add the flight to the cloud./api/upload/Flight InfoA public summary of one flight, with its charts./api/flight_info/SearchFind public flights by serial, tag or competitor tag./api/flight_search/
The ground and what is on it
Terrain ElevationGround height at a point, a list of points or a block./api/terrain/Terrain GridA grid of ground heights over up to 100 km./api/terrain_grid/Line of SightWhether two places can see each other, for radio or the eye./api/los/Tree CanopyTree heights cell by cell over a square up to 30 km./api/trees/Inland WaterLakes, rivers, streams and ditches over a square./api/water/Roads & RailwaysMain roads and railways over a square, by type./api/roads/Wind TurbinesTurbines near a point, with their heights./api/turbines/Power LinesOverhead lines and pylons over a square./api/power/
Weather
Weather DataA day of winds, temperatures and air density by height./api/weather/
GNSS
GNSS Seed DataOrbit files for a fast first fix on GNSS receivers, rebuilt every 10 minutes. Plain files, no limits./api/gnss/
Landing prediction
Landing PredictionWhere a rocket will come down, with the hazards and the radio. Needs your key./api/predict/

Limits

Counted per address without a key, and per key with one. A free key from your profile raises every limit.

Group
Per 5 minutes
Per hour
Per day
Light
30 / 150
300 / 1,500
2,000 / 10,000
Medium
10 / 30
60 / 200
300 / 1,500
Heavy
20 / 60
120 / 400
500 / 2,000
Upload & verify
60 / 1,000
600 / 10,000
5,000 / 50,000
Landing prediction
0 / 10
0 / 60
0 / 300
Black is without a key, blue is with one. Heavy map requests count each 100 square km as one. Every answer carries X-RateLimit-Remaining, and past a limit you get error 429 with retry_after.
Free for non-commercial use

Clubs, competitions, flyers and personal projects use the API free of charge. Please credit the data sources each page lists.

Commercial use

May be possible depending on the data you need. Contact us with what you have in mind.

Crediting AltimeterCloud

Free to use. If you use any of our APIs, or anything made from the answers, in a commercial product or service, credit AltimeterCloud with a link to www.altimetercloud.com at the point of use: on the screen, page or printout where the data appears, for example “Data from AltimeterCloud.com”. Any credits the data's own sources ask for, listed on this page, apply as well.