Lietuvos gravimetrinio tinklo charakteristikos

The 9th International Conference "Environmental Engineering 2014"

2014

Self Cite

Geodetic measurements are performed in heterogeneous gravity field. Its equipotential surfaces have a complex shape. This needs to be estimated when processing detail geodetic measurements data. Orthometric heights are calculated from one of the equipotential surfacegeoid. Applying the normal height system and evaluating normal height differences needs to assess the non-parallelity of the equipotential surfaces of the gravity field. For that aim normal corrections, defining the non-parallelity of equipotential surfaces of normal gravity field and the deviation of the equipotential surfaces of real gravity field from the normal field are calculated. This work presents determination feasibility of the gravity field equipotential surfaces non-parallelity in Lithuanian territory. The six geodetic vertical network lines were selected for a research; the length of all lines is about 300 km. The gravimetric measurements by Scintrex CG-5 were performed at 203 points of the net. A mean square error of gravity acceleration values did not exceed 14 µGal. The normal corrections were calculated for measured height differences between points. A research shows that after reduction of a number of measured points twice, a mean square error of gravity acceleration values, calculated from interpolated Bouguer gravity anomalies, at the "not measured" points seeks 0.474 mGal, however the normal correction values have changed only in 0.01 mm. The use of gravity acceleration values, obtained from gravimetric map with the mean square error of 0.684 mGal, changes normal corrections up to 0.04 mm.

Section: G/cm δ =mentioning

confidence: 99%

Investigation on the determination feasibility of the non-parallelity of the gravity field equipotential surfaces

The 9th International Conference "Environmental Engineering 2014"

2014

Self Cite

“…Naujų galimybių, atliekant gravimetrinius matavimus, teikia automatiniai kvarciniai gravimetrai (Birvydienė et al 2009;Paršeliūnas et al 2008Paršeliūnas et al , 2010b, todėl svarbu šiuos gravimetrus tirti toliau. Darbo tikslas -pateikti matavimų duomenų, gautų, atliekant tyrimus gravimetrais Scintrex CG-5, analizę.…”

Section: įVadasunclassified

“…Per ketverius metus keturiais gravimetrais Scintrex CG-5 atlikta 12 gravimetrinės bazės matavimų. 2007-2009 m. -po du bazinius matavimus (Birvydienė et al 2009;Paršeliūnas et al 2010b) -prieš ir po matavimų, atliekamų sudarant Lietuvos antrosios klasės gravimetrinį tinklą. Matavimai punktuose vyko šia seka: VILNIUS, PaNEVĖŽYS, SaLOČIaI, PaNEVĖŽYS, VILNIUS, EIŠIŠKĖS, VILNIUS.…”

Section: Gravimetrinės Bazės Matavimų Analizėunclassified

Investigation Into Measurements Using Gravimeters Scintrex Cg-5 / Matavimų Scintrex Cg-5 Gravimetrais Analizė / Анализ Измерений, Проведенных Гравиметрами Scintrex Cg-5

Geodesy and Cartography

et al. 2012

Self Cite

The article investigates four automatic gravimeters Scintrex CG-5. With reference to the measurements of the gravimetric calibration base set up in Lithuania, linear scale coefficients and the character of changes in the linear scale coefficients of gravimeters were estimated. The paper examines the vertical gradient of gravity acceleration in the eight-floor building, evaluates the range of changes into gravimeter drifts under laboratory conditions and describes daily gravimeter drift during gravimetric measurements. Santrauka Atlikti keturių Scintrex CG-5 gravimetrų tyrimai. Remiantis gravimetrinės bazės, įrengtos Lietuvos teritorijoje, matavimų duomenimis, nustatyta gravimetrų kalibravimo koeficientai ir jų kitimo pobūdis. Atlikti sunkio pagreičio vertikaliojo gradiento aštuonių aukštų pastate tyrimai. Laboratorinėmis sąlygomis nustatytas gravimetrų paros nulio slinkties kitimo diapazonas. Atlikti gravimetrų nulio slinkties matavimų metu tyrimai. Резюме Проведены исследования четырех гравиметров Scintrex CG-5. На основании измерений гравиметрической базы, находящейся на территории Литвы, получены коэффициенты калибровки гравиметров. Проведены исследования вертикального градиента ускорения силы тяжести в восьмиэтажном здании. Определен диапазон изменения лабораторного суточного смещения нуль-пункта гравиметров. Также оценено смещение нуль-пункта гравиметров во время измерений гравиметрической базы.

New Research on Gravity Field in Lithuanian Territory

Proccedings of 10th International Conference "Environmental Engineering"

et al. 2017

New research of Lithuanian territory gravity field was started in 2016 with aim to improve accuracy of quasigeoid as well as accuracy of normal heights determined by methods of satellite geodesy. Obtained data could be used in the research of geophysics, geodynamics as well as in performing the precise navigation. Quartz automatic gravimeters Scintrex CG-5 are planned to be used for the survey consisting of 30000 points. Method of gravity measurements was worked out. RMS error of gravity determined with this method does not exceed 60 @Gal. Coordinates and heights of measured points are determined with GNSS using LitPOS network and LIT15G quasigeoid model. RMS error of coordinate determination does not exceed 0,20 m, for normal heights – 0,15 m. Method of gravity anomalies determination and their accuracy estimation was prepared.