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Models for Fitting Gravimetric Geoids and gps Results

Geo-Spatial Information Science 2002年第1期5卷 28-30页

作者： Essam Ghanem LI Jiancheng LIU Jingnan Banha Higher Institute of Technology (BHIT) Banha Egypt

The aim of this investigation is to study how to use a gravimetric (quasi) geoid for levelling by gps data in an optimal *** advent of precise geodetic gps has made the use of a technique possible,which might be called gps_ gravimetric geoid *** this approach,gps heights above the reference ellipsoid are determined for points whose levelled (orthometric) height H is above sea level people have already surveyed;for these points,we thus have the values of the geoid undulation N .These values are then used to constrain the geoid undulations N′ obtained from the gravimetric solution.

关键词： gravimetric geoid gps/levelling fitting

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Determination of a Gravimetric Geoid Solution for Andalusia (South Spain)

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Engineering（科研） 2010年第3期2卷 160-165页

作者： Francisco Manzano Victor Corchete Mimoun Chourak Gil Manzano 不详

The orthometric heights can be obtained without levelling by means of the ellipsoidal and geoidal heights. For engineering purposes, these orthometric heights must be determined with high accuracy. For this reason, the determination of a high-resolution geoid is necessary. In Andalusia (South Spain) a new geopotential model (EIGEN-GL04C) has been available since the publication of a more recent regional geoid. As a consequence, these new data bring about improvements that ought to be included in a new regional geoid of Andalusia. With this aim in mind, a new gravimetric geoid determination has been carried out, in which these new data have been included. Thus, a new geoid is provided as a data grid distributed for the South Spain area from 36 to 39 degrees of latitude and –7 to –1 degrees of longitude (extending to 3 × 6 degrees), in a 120 × 240 regular grid with a mesh size of 1.5’ × 1.5’ and 28800 points in the GRS80 reference system. This calculated geoid and previous geoids are compared to the geoid undulations obtained for 262 gps/levelling points, distributed within the study area. The new geoid shows an improvement in accuracy and reliability, fitting the geoidal heights determined for these gps-levelling points better than any previous geoid.

关键词： Gravity Geoid FFT gps/levelling Andalusia South Spain

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