Abstract

The paper surveys the reliability of interpolated results conducted from six interpolation methods terrain effect in height anomaly (∆N) for points inside the calculated net. Results from the three representative mountainous areas show quite good reliability. In the Northwest, results appear with different mean deviations, including maximum value (9mm) obtained by the distance inverse methods, and minimum value (4mm) obtained by the squared area inverse one. In the Central Highlands and Central areas, results appear with the mean deviations of approximately equal value (values of 7mm and 4-5mm for the Central and Central Highlands areas respectively). Therefore, in optimal intepolating ∆N for grid points inside the calculated net, the squared area inverse method should be employed for the Northwest area, while one of the six methods defined in the paper can be employed for the Central and Central Higlands areas.