Determination of Geopotential Differences between Local Vertical Datums and Realization of a World Height System   总被引：2，自引：0，他引：2  

Burša  Milan  Kouba  Jan  Müller  Achim  Raděj  Karel  True  Scott A.  Vatrt  Viliam  Vojtíšková  Marie 《Studia Geophysica et Geodaetica》2001,45(2):127-132

The methodology developed for connecting Local Vertical Datums (LVD) was applied to the Australian Height Datum (AHD) and the North American Vertical Datum (NAVD88). The geopotential values at AHD and NAVD88 were computed and the corresponding vertical offset of 974 mm with rms 51 mm was obtained between the zero reference surfaces defined by AHD and NAVD88. The solution is based on the four primary geodetic parameters, the GPS/levelling sites and the geopotential model EGM96. The Global Height System (or the Major Vertical Datum) can be defined by a geoidal geopotential value used in the solution as the reference value, or by the geopotential value of the LVD, e.g. NAVD88.  相似文献   

Parameters of the Earth's tri-axial level ellipsoid     

Milan Burša  Vladimíra Fialová 《Studia Geophysica et Geodaetica》1993,37(1):1-13

Summary Four parameters defining the Earth's tri-axial ellipsoid (E) have been derived on the basis of the condition that the gravity potential on E be constant and equal to the actual geopotential value (W₀) on the geoid. The geocentric gravitational constant, the angular velocity of the Earth's rotation, the actual 2nd degree geopotential Stokes parameters and W₀ are taken to be the primary geodetic constants defining E and its (normal) gravity field.  相似文献   

Corrections to the european datum by means of the european astrogeodetic network     

Milan Burša 《Studia Geophysica et Geodaetica》1963,7(3):284-285

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Bemerkungen zu den Arbeiten der Ehemaligen Wolkenforschungsstelle in Prag (I. Teil)     

Josef Podzimek  Milan Koldovsky 《Studia Geophysica et Geodaetica》1957,1(2):327-341

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Electromagnetic induction in a half-space with a cylindrical inhomogeneity     

Milan Hvoždara  Reviewer O. Praus 《Studia Geophysica et Geodaetica》1972,16(3):240-261

Summary The problem of electromagnetic induction in a half-space with a cylindrical inhomogeneity is treated. Solutions for TE and TM polarization of the exciting electromagnetic field are given, which can be used for computing sounding and profiling curves. The anisotropy of the surface impedance is pointed out, as well as a whole series of other interesting properties of the magnetotelluric field in this model; some of them are also demonstrated on the computed theoretical curves.  相似文献   

Best-fitting tri-axial earth ellipsoid parameters derived from satellite observations     

Milan Burša 《Studia Geophysica et Geodaetica》1970,14(1):1-9

Résumé De l'ensemble des coefficients harmoniques du développement du géopotentiel [3, 6, 7], calculé à partir des variations des éléments orbitaux des satellites, on a calculé les paramètres de l'ellipso?de terrestre triaxial, représentant la surface du géo?de. La solution fut effectuée par méthode analytique sous la condition du minimum de l'intégrale du carré de l'écart du rayon vecteur du géo?de et de l'ellipso?de, de même que par calcul numérique à partir des valeurs discrètes 10°×10°.

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Address: Politickych vězňů 12, Praha 1-Nové Město.  相似文献   

Global geoid sections determined by satellite orbit dynamics     

Milan Burša 《Studia Geophysica et Geodaetica》1970,14(3):274-285

Summary This paper ties up with [5, 6] the fundamental notations of which have been adopted. The sets of Stokes' constants (harmonic coefficients) J _n ^(k) , S _n ^(k) were adopted from [4], and the scale factor for lengths, R₀=GM/W₀, from [5]. The equations for global meridional and parallel sections of the geoid surface W=W₀ are formulated. The geoid sections are represented by best fitting ellipses, as regards the meridians always for the arcs between the equator and the pole. Address: Politickych vězňů 12, Praha 1-Nové Město.  相似文献   

Chemical composition and physical properties of lithium-iron micas from the Krušné hory Mts. (Erzgebirge)     

Milan Rieder  Miroslav Huka  Dagmar Kučerová  Luděk Minařík  Jiří Obermajer  Pavel Povondra 《Contributions to Mineralogy and Petrology》1970,27(2):131-158

Compositions of natural lithium-iron micas are approximated best by the sidero-phyllite-polylithionite join. These micas contain little or no magnesium and manganese. Their octahedral sheets contain close to two trivalent cations (mainly aluminum) in small crystallographic sites and a variable quantity of lithium and R⁺² (mainly iron) in large sites. Octahedral vacancies are situated mostly in large sites. Lithium and R⁺² approach a 44 replacement relationship in micas with octahedral occupancy close to six. Lithium and fluorine show a good positive correlation (small excess of fluorine over lithium), which indicates a crystallochemical association between them. There is a less distinct positive correlation between lithium and R⁺⁴.Based on simplifications, a calculation shows that about two-thirds of octahedral vacancies are caused by substitutions within the octahedral sheet, one-third, by tetrahedral substitutions. Different methods of calculating the crystallochemical formula yield slightly different numbers of octahedral vacancies, but do not affect the mica's position in plots of physical parameters against composition. If a crystallochemical formula is calculated from analysis of a mica contaminated with quartz, topaz, or feldspar, the apparent number of octahedral vacancies increases; such a formula exhibits unusual behavior in composition plots.  相似文献   

On the mutual position of Clarke's and Hayford's ellipsoids of the NAD-27 and the EUR reference systems     

Milan Burša 《Studia Geophysica et Geodaetica》1968,12(2):122-135

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Earth’s flattening and harmonic coefficients of geopotential     

Milan Burša 《Studia Geophysica et Geodaetica》1968,12(3):237-245

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