Description:
The ITALGEO99 gravimetric quasi-geoid has been computed in the
area 36° < lat < 47°, 6° < lon < 19° on a 2'x 2' regular
geographical grid. With respect to the previous ITALGEO95 estimate,
new gravity data have been included in the gravity data base
(Slovenia area) and a completely revised DTM has been used for
the Residual Terrain Correction computation. Furthermore, the more
recent global geopotential models EGM96 and GPM98CR have been tested
to account for the long wavelength features of gravity and quasi-geoid.
The method that was applied to get the final estimate is basically the
same used for computing ITALGEO95, i.e. the "remove-restore" technique
plus Fast Collocation. In this way, the solution was obtained over
the entire window in one step only. Comparisons with GPS/leveling
GEOTRAV data show that improvements have been reached with respect
to ITALGEO95, especially in Sicily and Sardinia where the ITALGEO99
quasi-geoid has a sub-decimetric precision.
References:
R. Barzaghi, B. Betti, A. Borghi, G. Sona, V. Tornatore (2002). The Italian
quasi-geoid ITALGEO99. Bollettino di Geodesia e Scienze Affini, 61(1), pp. 33-51.
|
