TY - GEN

T1 - Status of the European Gravity and Geoid Project EGGP

AU - Denker, H.

AU - Barriot, J. P.

AU - Barzaghi, R.

AU - Forsberg, R.

AU - Ihde, J.

AU - Kenyeres, A.

AU - Marti, U.

AU - Tziavos, I. N.

N1 - Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2005/9

Y1 - 2005/9

N2 - The European Gravity and Geoid Project (EGGP) is a project within I AG Commission 2, reporting to Sub-commission 2.4. The main goal of the project is to compute an improved European geoid and quasigeoid model. This appears to be possible now because significant new and improved data sets have become available since the last computation in 1997 (EGG97). These improvements include better global geopotential models from the CHAMP and GRACE missions, better digital elevation models (DEMs) in some regions (e.g., new national DEMs, SRTM3, GTOPO30), updated gravity data sets for selected regions, updated ship and altimetric gravity data including improved merging procedures, the use of GPS/levelling data, as well as improved modelling and computation techniques. An overview is given on the project structure, the computation strategy, the available data sets, the expected accuracies, the time schedule, and the work done so far. The primary input data sets are high-resolution gravity and terrain data supplemented by a state-of-the-art global geopotential model. The general computation strategy is the removerestore procedure. The initial computations are based on the spectral combination approach with integral formulas evaluated by ID FFT. First results based on an updated terrestrial gravity data set and GRACE geopotential models show significant improvements (up to 60%) as compared to GPS/- levelling. Moreover, also the tilts, existing in previous solutions, have been reduced to typically below 0.1 ppm.

AB - The European Gravity and Geoid Project (EGGP) is a project within I AG Commission 2, reporting to Sub-commission 2.4. The main goal of the project is to compute an improved European geoid and quasigeoid model. This appears to be possible now because significant new and improved data sets have become available since the last computation in 1997 (EGG97). These improvements include better global geopotential models from the CHAMP and GRACE missions, better digital elevation models (DEMs) in some regions (e.g., new national DEMs, SRTM3, GTOPO30), updated gravity data sets for selected regions, updated ship and altimetric gravity data including improved merging procedures, the use of GPS/levelling data, as well as improved modelling and computation techniques. An overview is given on the project structure, the computation strategy, the available data sets, the expected accuracies, the time schedule, and the work done so far. The primary input data sets are high-resolution gravity and terrain data supplemented by a state-of-the-art global geopotential model. The general computation strategy is the removerestore procedure. The initial computations are based on the spectral combination approach with integral formulas evaluated by ID FFT. First results based on an updated terrestrial gravity data set and GRACE geopotential models show significant improvements (up to 60%) as compared to GPS/- levelling. Moreover, also the tilts, existing in previous solutions, have been reduced to typically below 0.1 ppm.

KW - CHAMP

KW - EGGP

KW - Geoid

KW - GPS/levelling

KW - GRACE

KW - Gravity field modelling

KW - Quasigeoid

UR - http://www.scopus.com/inward/record.url?scp=33845397403&partnerID=8YFLogxK

U2 - 10.1007/3-540-26932-0_22

DO - 10.1007/3-540-26932-0_22

M3 - Conference contribution

AN - SCOPUS:33845397403

SN - 978-3-540-26930-4

T3 - International Association of Geodesy Symposia

SP - 125

EP - 130

BT - Gravity, Geoid and Space Missions

ER -