{"id":"geo-initial-bearing","version":"1.0.0","description":"Compute the initial spherical bearing from point A to point B and return degrees clockwise from true north.","supported_operations":["bearing from point A to point B in degrees","initial bearing between coordinates","calculate compass heading between GPS points","forward azimuth from latitude longitude","direction from one coordinate to another","great circle starting bearing"],"unsupported_operations":["final bearing at destination","magnetic compass bearing"],"semantics":["Uses the spherical great-circle model, not a Karney or Vincenty ellipsoidal geodesic; Earth-model error is typically up to about 0.5%.","Angles are decimal degrees; bearings are clockwise from true north and results are rounded to 12 decimal places.","Initial bearing is radius-independent; no Earth-radius input is accepted."],"limits":{"max_input_bytes":512,"max_output_bytes":256,"max_items":7,"max_iterations":1},"pricing":{"status":"unpriced","charge_usd":null},"input_schema":{"type":"object","additionalProperties":false,"required":["lat1_deg","lon1_deg","lat2_deg","lon2_deg"],"properties":{"lat1_deg":{"type":"number","minimum":-90,"maximum":90},"lon1_deg":{"type":"number","minimum":-180,"maximum":180},"lat2_deg":{"type":"number","minimum":-90,"maximum":90},"lon2_deg":{"type":"number","minimum":-180,"maximum":180},"precision_decimals":{"type":"number","minimum":0,"maximum":12,"multipleOf":1}}},"output_schema":{"type":"object","additionalProperties":false,"required":["initial_bearing_deg","standard_version"],"properties":{"initial_bearing_deg":{"type":"number","minimum":0,"exclusiveMaximum":360},"standard_version":{"type":"string","const":"Sinnott-1984/IUGG-GRS80"}}},"examples":[{"input":{"lat1_deg":0,"lon1_deg":0,"lat2_deg":0,"lon2_deg":90},"output":{"initial_bearing_deg":90,"standard_version":"Sinnott-1984/IUGG-GRS80"}},{"input":{"lat1_deg":0,"lon1_deg":0,"lat2_deg":90,"lon2_deg":0},"output":{"initial_bearing_deg":0,"standard_version":"Sinnott-1984/IUGG-GRS80"}}],"execute_url":"/v1/tools/geo-initial-bearing/versions/1.0.0/execute"}