IGFS Data and Products
IGFS collects through its services gravity, geoid, GEM, DEM, SG raw, and tidal products for use in a wide range of geodetic, geophysical, and oceanographic works. These data sets are used by the geodetic community and the IGFS services members, SGs, and JWGs, to generate the data products which are made available to interested users through this website.
Gravity and Geoid metadata
The International Gravity Field Service Central Bureau (IGFS CB) develops and provides online applications for the creation of metadata for gravity and geoid data. Additionally, the IGFS CB provides a service for searching the metadata database of the CB in order to locate dataset sources.
The gravity data available refer to a collection, on a world-wide basis, of all measurements and pertinent information about the Earth gravity field. They are compiled and stored in in a computerized data base, either as point values and gravity anomaly (free-air, Bouguer, isostatic) grids.
The geoid data available refer to a collection of geoid models on a worldwide scale which are available for download, along with dedicated software for geoid determination.
Global Earth Gravity Models
The GEMs database refers to a collection of all available static global earth gravity models with their detailed description and conventions. Moreover, GRACE-based monthly solutions are available. A calculation and visualization service for both static and time-varying GEMs is also available along with pointwise EWH estimates for points around the globe.
Time-variable Global Earth Gravity Models
COST-G provides consolidated monthly global gravity models in terms of spherical harmonic (SH) coefficients and thereof derived grids by combining solutions from individual analysis centers (ACs). The ACs adopt different analysis methods but apply agreed-upon consistent processing standards to deliver time-variable gravity field models, e.g. from GRACE/GRACE-FO low-low satellite-to-satellite tracking (ll-SST), high-low satellite-to-satellite tracking (hl-SST), Satellite Laser Ranging (SLR).
The database refers to Digital Elevation Models, relevant software for DEM creation, assessment, manipulation and display.
SG and Tide Data
The database contains long-term records from ground gravimeters, tiltmeters, strainmeters and other geodynamic sensors to monitor temporal variations of the Earth gravity field through. Various Levels of data are available depending on their processing, from raw Level1 to processed Level 3 data. Various tidal analysis and prediction software is also available
Gravity and geoid metadata
Online applications for the creation of metadata for gravity and geoid data. Service for searching the metadata database.
Land, marine, airborne gravity data as point and gridded values. Absolute and relative gracity data, WGM
Global Earth Models
Collection and archive of all existing global gravity field models, web interface for access to GEMs, model visualization and service.
Combined gravity field solutions in SH coefficients and spatial grids for hydrological, oceanic and polar ice sheets applications.