Search Results - "Kotsakis, C."

Reference frame stability and nonlinear distortion in minimum-constrained network adjustment by Kotsakis, C.

“…The aim of this paper is to investigate the influence of the minimum constraints (MCs) on the reference frame parameters in a free-net solution. The…”
Get full text

Generalized inner constraints for geodetic network densification problems by Kotsakis, C.

“…The estimated coordinates from a minimum-constrained (MC) network adjustment are generally influenced by two different error sources, that is the data noise…”
Get full text

Rank defect analysis and the realization of proper singularity in normal equations of geodetic networks by Kotsakis, C., Chatzinikos, M.

“…The singularity of input normal equations (NEQ) is a crucial element for their optimal handling in the context of terrestrial reference frame (TRF) estimation…”
Get full text

On the importance of intra-frame and inter-frame covariances in frame transformation theory by Kotsakis, C., Vatalis, A., Sansò, F.

“…The coordinate frame transformation (CFT) problem in geodesy is typically solved by a stepwise approach which entails both inverse and forward treatment of the…”
Get full text

A conventional approach for comparing vertical reference frames by Kotsakis, C.

“…A conventional transformation model between different realizations of a vertical reference system is an important tool for geodetic studies related to precise…”
Get full text

A type of biased estimators for linear models with uniformly biased data by KOTSAKIS, C

“…The objective of this paper is the comparison of various types of estimators that can be used in linear models with uniformly biased data. This particular case…”
Get full text

On the trade-off between model expansion, model shrinking, and parameter estimation accuracy in least-squares data analysis by KOTSAKIS, C

“…A systematic investigation of over-parameterized and under-parameterized formulations in the least-squares adjustment of linear models is performed in this…”
Get full text

On the adjustment of combined GPS/levelling/geoid networks by KOTSAKIS, C, SIDERIS, M. G

Get full text

The multiresolution character of collocation by KOTSAKIS, C

Get full text

Comments and reply regarding Kotsakis (2005) “A type of biased estimators for linear models with uniformly biased data” by Koch, K. -R., Kotsakis, C.

Get full text

A modified Wiener-type filter for geodetic estimation problems with non-stationary noise by KOTSAKIS, C, SIDERIS, M. G

Get full text

Estimation of the zero-height geopotential level W o LVD in a local vertical datum from inversion of co-located GPS, leveling and geoid heights: a case study in the Hellenic islands by Kotsakis, C., Katsambalos, K., Ampatzidis, D.

Get full text

Estimation of the zero-height geopotential level W sub(o) super(LVD) in a local vertical datum from inversion of co-located GPS, leveling and geoid heights: a case study in the Hellenic islands by Kotsakis, C, Katsambalos, K, Ampatzidis, D

“…The estimation of the zero-height geopotential level of a local vertical datum (LVD) is a key task towards the connection of isolated physical height frames…”
Get full text

Estimation of the zero-height geopotential level W ^sub o^^sup LVD^ in a local vertical datum from inversion of co-located GPS, leveling and geoid heights: a case study in the Hellenic islands by Kotsakis, C, Katsambalos, K, Ampatzidis, D

“…The estimation of the zero-height geopotential level of a local vertical datum (LVD) is a key task towards the connection of isolated physical height frames…”
Get full text

Estimation of the zero-height geopotential level WoLVD in a local vertical datum from inversion of co-located GPS, leveling and geoid heights: a case study in the Hellenic islands by Kotsakis, C., Katsambalos, K., Ampatzidis, D.

“…The estimation of the zero-height geopotential level of a local vertical datum (LVD) is a key task towards the connection of isolated physical height frames…”
Get full text

Enhancing Geohazard Resilience in Cyprus: The Cyclops+ Integrated GNSS and InSAR Strategic Monitoring Infrastructure by Danezis, C., Kakoullis, D., Fotiou, K., Chatzinikos, M., Kotsakis, C., Ioannou, G., Tzouvaras, M., Subiza, N. Ibarrola, Brcic, R., Eineder, M.

“…CyCLOPS is the only Tier-1 permanent GNSS station network in Cyprus and it is currently comprised of GNSS CORS, co-located with precise weather stations, tilt…”
Get full text

How Accurately Can We Determine Orthometric Height Differences from GPS and Geoid Data? by Fotopoulos, Georgia, Kotsakis, Christopher, Sideris, Michael G

“…The optimal combination of global positioning system (GPS) geometric heights with gravimetrically derived geoid undulations for the determination of…”
Get full text