Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Christoforos Kotsakis"'
Publikováno v:
Sensors, Vol 20, Iss 6, p 1768 (2020)
Sensors
Volume 20
Issue 6
Sensors (Basel, Switzerland)
Sensors
Volume 20
Issue 6
Sensors (Basel, Switzerland)
Permanent Global Navigation Satellite Systems (GNSS) reference stations are well established as a powerful tool for the estimation of deformation induced by man-made or physical processes. GNSS sensors are successfully used to determine positions and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03dcd65041bb88d81dd49b4f5bf4a959
https://www.mdpi.com/1424-8220/20/6/1768
https://www.mdpi.com/1424-8220/20/6/1768
Publikováno v:
Survey Review. 49:386-398
The paper presents a detailed accuracy evaluation of the Hellenic Geodetic Reference System 1987 (HGRS87), a non-geocentric traditional local datum which was established thirty years ago and it is still used as the official coordinate system for surv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::022a6c6bf596f068ed3a3b686d803f06
https://doi.org/10.1080/00396265.2016.1180797
https://doi.org/10.1080/00396265.2016.1180797
Autor:
Christoforos Kotsakis
Publikováno v:
Journal of Geodesy. 87:661-673
The estimated coordinates from a minimum-constrained (MC) network adjustment are generally influenced by two different error sources, that is the data noise from the available measurements and the so-called datum noise due to random errors in the fid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37d8cfa44d7793c0fe3444a4a65468bd
https://doi.org/10.1007/s00190-013-0637-0
https://doi.org/10.1007/s00190-013-0637-0
Autor:
Christoforos Kotsakis
Publikováno v:
Journal of Geodetic Science, Vol 2, Iss 4, Pp 319-324 (2012)
A conventional transformation model between different realizations of a vertical reference system is an important tool for geodetic studies related to precise vertical positioning and physical height determination. Its fundamental role is the evaluat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d6803d55c7c056a25d53f5248aca23e
https://doaj.org/article/587507e2153146fc9dcec28b38e45b53
https://doaj.org/article/587507e2153146fc9dcec28b38e45b53
Autor:
Christoforos Kotsakis
Publikováno v:
Journal of Geodesy. 86:755-774
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 non-estimable part of these parameters (which is not reduced by the available data) is analysed in te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31b1a1fccfc4b9963dde65340ae40a74
https://doi.org/10.1007/s00190-012-0555-6
https://doi.org/10.1007/s00190-012-0555-6
Autor:
K. Katsambalos, Christoforos Kotsakis
Publikováno v:
Survey Review. 42:327-344
The aim of this study is to present the results of several 'external' quality tests for the most recent (at the time of writing this paper) global geopotential models (GGMs) using precise GPS and leveled orthometric heights over the area of Greece. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4906a0be3330a5a56a4993bb73e4c30f
https://doi.org/10.1179/003962610x12747001420500
https://doi.org/10.1179/003962610x12747001420500
Autor:
Christoforos Kotsakis
Publikováno v:
Geophysical Journal International. 171:509-522
SUMMARY The optimal inversion of a linear model under the presence of additive random noise in the input data is a typical problem in many geodetic and geophysical applications. Various methods have been developed and applied for the solution of this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5dfad1176597aa9d0a2c1e725289877
https://doi.org/10.1111/j.1365-246x.2007.03534.x
https://doi.org/10.1111/j.1365-246x.2007.03534.x
Autor:
Christoforos Kotsakis
Publikováno v:
Journal of Geodesy. 82:249-260
Transforming height information that refers to an ellipsoidal Earth reference model, such as the geometric heights determined from GPS measurements or the geoid undulations obtained by a gravimetric geoid solution, from one geodetic reference frame (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8179be649e988d4dc841e02e630076e0
https://doi.org/10.1007/s00190-007-0174-9
https://doi.org/10.1007/s00190-007-0174-9
Autor:
Christoforos Kotsakis
Publikováno v:
Journal of Geodesy. 81:661-677
Most geostatistical methods for spatial random field (SRF) prediction using discrete data, including least-squares collocation (LSC) and the various forms of kriging, rely on the use of prior models describing the spatial correlation of the unknown f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::055aa4d17d82d7f29e42df1aad437c29
https://doi.org/10.1007/s00190-007-0133-5
https://doi.org/10.1007/s00190-007-0133-5
Autor:
Christoforos Kotsakis
Publikováno v:
VIII Hotine-Marussi Symposium on Mathematical Geodesy ISBN: 9783319245485
The aim of this paper is to present a general solution of the weight choice problem for the reference stations in minimally constrained network adjustment. Our treatment is based on the optimization of the accuracy of the estimated network coordinate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::015e15fa0c625af3776872eedc2e9ed6
https://doi.org/10.1007/1345_2015_139
https://doi.org/10.1007/1345_2015_139
