 |
| Titel |
Derivation of topographic potential from global DEM models |
| VerfasserIn |
Christian Gruber, Pavel Novak, Franz Barthelmes |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250054597
|
|
|
|
|
|
| Zusammenfassung |
| Spherical harmonic expansions to ultra-high resolutions (degree/order of the order of 10,000)
can be used to transform globally available digital elevation models (DEMs) into
a high-frequency contribution of the Earth’s gravitational potential. Therefore it
interconnects satellite-based gravity measurements (GRACE, GOCE) with available
ground based observations such as height anomalies computed from GNSS-leveling
or from ground gravity data. Besides a numerically stable and computationally
efficient method for the harmonic expansion on the reference sphere, the transfer from
geodetic to geographic coordinates and full data restoration to appropriate heights (3D
synthesis) have to be also considered. Using the series expansion, spherical harmonic
coefficients of the global height function (given in terms of DEM) can eventually be
transformed into the topographical potential and topography-reduced (Bouguer) gravity
anomalies.
The used concepts will be discussed and results based on ETOPO1 and ACE2 will be
evaluated against results based on the classical Newtonian integration applied in local
areas. |
|
|
|
|
|
|