The gravitational field of the earth is non-uniform. The geoid is the shape the ocean surface would take if only gravity and the rotation of the Earth were considered. The geoid is the surface that defines zero elevation.
The geoid height is the difference between an ideal reference ellipsoid and the geoid.
The gravity anomaly is the difference between the acceleration due to gravity on the Earth's surface and the value calculated assuming the reference ellipsoid.
The official Earth Gravitational Model EGM2008 was developed and released to the public by the National Geospatial-Intelligence Agency (NGA).
Potential applications:
Our Gravity API provides on-demand access to the EGM2008 model.
Calculate the geoid height for a given latitude / longitude using EGM2008
Object | Description |
---|
{
"height": {
"units": "m",
"value": 45.88107058892659
}
}
curl --location --request GET 'https://zylalabs.com/api/3316/earth+gravity+api/3568/geoid+height' --header 'Authorization: Bearer YOUR_API_KEY'
The gravity anomaly is the difference between the acceleration due to gravity on the Earth's surface and the value calculated assuming the reference ellipsoid.
Object | Description |
---|---|
latitude |
[Required] Geographic latitude (-90 to 90 deg). |
longitude |
[Required] Geographic longitude (-180 to 180 deg). |
{
"eta": {
"units": "arcsec",
"value": -0.9413662219916251
},
"gravity_anomaly": {
"units": "mGal",
"value": 27.954737031742376
},
"xi": {
"units": "arcsec",
"value": 1.371151956763653
}
}
curl --location --request GET 'https://zylalabs.com/api/3316/earth+gravity+api/3569/gravity+anomaly?latitude=-45&longitude=-45' --header 'Authorization: Bearer YOUR_API_KEY'
After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Earth Gravity API REST API, simply include your bearer token in the Authorization header.
Header | Description |
---|---|
Authorization
|
[Required] Should be Bearer access_key . See "Your API Access Key" above when you are subscribed. |
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The gravitational field of the earth is non-uniform. The geoid is the shape the ocean surface would take if only gravity and the rotation of the Earth were considered. The geoid is the surface that defines zero elevation.
The geoid height is the difference between an ideal reference ellipsoid and the geoid. Variations in the geoid height are related to the density of the earth, so they can help us to better understand its internal structure. It is also used to measure surface elevations to high accuracy which is useful in applications such as GPS and surveying.
The gravity anomaly is the difference between the acceleration due to gravity on the Earth's surface and the value calculated assuming the reference ellipsoid.
The official 2008 Earth Gravitational Model EGM2008 was developed and released to the public by the National Geospatial-Intelligence Agency (NGA). This gravitational model is complete to spherical harmonic degree and order 2159. Our Earth Gravity API provides programmatic access to the EGM2008 model.
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