Reduced the measured differences between heights estimating influence of vertical earth movements/Ismatuotu auksciu skirtumu redukavimas ivertinant vertikaliuosius zemes pavirsiaus judesius

Levelling works are often stretched for some years. For this reason the measured data is influenced vertical by an earth movement. Aspiring to avoid this influence the measured differences between heights should be reduced on the epoch selected us. Research is made by an example of a vertical geodetic network of Lithuania. The received results of research shows that amendments reduced for the epoch selected us significant and more than other amendments used at data processing of levelling. To calculate influence of amendments from for vertical earth movements it is recommended applying regression model's for forecasts of speeds of vertical earth movements or model of horizontal gradients of speeds of vertical movements. Keywords: measured height difference, vertical movements of the Erth crust, reduction to same epoch, corrections due to vertical movements of the Erth crust. Atliekant niveliavimo matavimus darbai daznai tesiasi keleta metu. Del sios priezasties niveliavimo matavimu duomenims itakos gali tureti vertikalieji Zemes plutos judesiai. Siekiant isvengti sios itakos, ismatuoti auksciu skirtumai turi buti redukuojami atsizvelgiant i pasirinkta epocha. Tyrimai atlikti Lietuvos vertikaliojo geodezinio tinklo pavyzdziu. Nustatyta, kad eksperimentiniame objekte niveliavimo matavimo rezultatu redukavimo, atsizvelgiant i pasirinkta epocha, pataisos yra reiksmingos ir didesnes uz kitas apdorojant niveliavimo matavimu rezultatus skaiciuotas pataisas. Pataisu del vertikaliuju Zemes plutos judesiu itaka skaiciuoti niveliaciniuose ejimuose rekomenduojama taikant regresinius vertikaliuju judesiu greiciu prognozavimo arba judesiu greiciu horizontaliuju gradientu modelius. Reiksminiai zodziai: ismatuoti auksciu skirtumai, vertikalieji Zemes plutos judesiai, redukavimas i viena laiko momenta, pataisos del vertikaliuju Zemes plutos judesiu.