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This paper presents a new approach for precision estimation for algebraic ellipse fitting based on combined least squares method. Our approach is based on coordinate description of the ellipse geometry to determine the error distances of the fitting method. Since it is an effective fitting algorithm the well-known Direct Ellipse Fitting method was selected as an algebraic method for precision estimation. Once an ellipse fitted to the given data points, algebraic distance residuals for each data point and fitting accuracy can be computed. Generally, the adopted approach has revealed geometrical aspect of precision estimation for algebraic ellipse fitting. The experimental results revealed that our approach might be a good choice for precision estimation of the ellipse fitting method.

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There are different criteria for designing a geodetic network in an optimal way. An optimum network can be regarded as a network having high precision, reliability and low cost. Accordingly, corresponding to these criteria different single-objective models can be defined. Each one can be subjected to two other criteria as constraints. Sometimes the constraints can be contradictory so that some of the constraints are violated. In this contribution, these models are mathematically reviewed. It is numerically shown how to prepare these mathematical models for optimization process through a simulated network. We found that the reliability model yields small position changes between those obtained using precision respectively. Elimination of some observations may happen using precision and cost model while the reliability model tries to save number of observations. In our numerical studies, no contradictions can be seen in reliability model and this model seems to be more suitable for designing of the geodetic and deformation networks.

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.W. Taylor G.J. Wasserburg 1988 Dating earthquakes with high-precision thorium- 230 ages of very young corals Earth and Planetary Science Letters

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M.J. Spicuzza 1995 UWG-2, a garnet standard for oxygen isotope ratios: Strategies for high precision and accuracy with laser heating Geochimica et Cosmochimica Acta

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8 11 12 Hertelendi, E., É. Csongor, L. Záborszky, I. Molnár, I. Gál, M. Győrffy, S. Nagy 1989: Counting system for high precision C-14 dating

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53 191 201 Hertelendi, E., E. Csongor, L. Záborszky, I. Molnár, I. Gál, M. Györffy, S. Nagy 1989: Counting system for high precision C-14 dating

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Central European Geology
Authors: Attila Demény, Gabriella Schöll-Barna, Pál Sümegi, Péter Sipos, István Fórizs, Brigitta Réka Balázs, Bernadett Bajnóczi, and Gordon Cook

. Nagy 1989 Counting system for high precision C-dating Radiocarbon 32 399 408 . E

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Central European Geology
Authors: Attila Demény, Alexandra Németh, Zoltán Kern, György Czuppon, Mihály Molnár, Szabolcs Leél-Őssy, Mihály Óvári, and József Stieber

, the variations are close to the analytical precision, hence these are not significant. The average values are more negative than the annual average of amount weighted precipitation compositions, suggesting more contribution from cold season

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Central European Geology
Authors: Zsófia Pálos, István János Kovács, Dávid Karátson, Tamás Biró, Judit Sándorné Kovács, Éva Bertalan, Anikó Besnyi, György Falus, Tamás Fancsik, Martina Tribus, László Előd Aradi, Csaba Szabó, and Viktor Wesztergom

about 150 μm. The thicknesses were measured with a Mitutoyo Digital micrometer with a precision of ±1 μm in the range of 0–20 mm. The thin sections were removed from the glass slides with acetone. To remove the traces of acetone, the samples were heated

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) the aspect of uncertainty or the “statistic” being quantified and (b) the precision required for the uncertainty assessment. They used two parameters in their analysis: (a) the deviation, Δ F , in units of cumulative probability, from the reported quantile

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