Abstract

Using of global digital elevation model (DEM) for calculation of a Faye corrections has remarkable advantage. That is it’s coverage over regions without any national topographic data. At present international science – technological organizations and devoloped coutries widely use the global digital elevation models for calculation of the Faye corrections in progress of construction of global and national gravity anomaly databases. Main standard for doing it are errors of height differences determined from DEM less than ± 50 m. Global digital elevation models meet this requirement. This scientific article proved abovementioned standard and accomplished experiments for accuracy estimation of the global digital elevation model SRTM1 (1” x 1”) based on 89 first order benchmarks in Vietnam. Results of experiments show that majority of differences between global and national increments are at level of some metrers, only first orser benchmark I(DN-BT)28has difference reached maximal value 19,577 m, RMS of the global increments is at level of ± 5,480m. So the global digital elevation model SRTM1 fully meet requirement of the calculation of the Faye corrections for the construction of the national gravity anomaly database in Vietnam.