In this paper, the most frequently used modelling areas of gravimetric geoid are discussed and conditions for choice of them are analysed. The primary condition is purpose to be achieved by modelling work, but also quality and quantity of available data, because often we have places, where gravimetric data are not available at all. In the case of Latvia, we could wish more dense coverage of gravimetric data in the eastern part of Lavia, otherwise greater stress shall be laid on results of satellites. As it is explained in the beginning of the article, modelling area is selected between meridian 18 of East longitude and meridian 30, as well between parallel 55 of North latitude and parallel 59. Works in such territory are not possible without cooperation with all neighbouring countries. Not only gravimetric data, but also geodetic support information on joint points of levelling network and GPS/GNSS network, which provide linkage of modelling results with practically used reference systems and assure compatibility of geodetic data among neighboring countries, i.e., in order to avoid sudden breaks or gaps on state borders. Thanks to space missions of special gravimetric satellites, particularily the most recent and promising mission of satellite GOCE, development of wide scope of global spheric harmonic geopotential models is expected, which will create confidence in ground gravimetric measurements and indicate errors, as well as it will be possible to obtain geoid models even for the territories, where ground gravimetric measurements are not carried out before. However this will not replace necessity for traditional absolute and relative gravimetric measurements, because there is connection that the closer to the surface of the Earth are the measurements, the more accurate they are. In our territory, we have to consider geodynamic processes of Earth crust, where regular vertical movements can be observed up to one ore two millimetres a year, which change the whole fixed reference system. Various satellite observations are envisaged in the nearest future as the most effective monitoring system, which will contribute to control and maintenance of geodetic reference system of the whole world and of Latvia.