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Bivariate and trivariate functions for interpolation from scattered data are derived. They are constructed by explicit minimization of a general smoothness functional, and they include a tension parameter that controls the character of the interpolation function (e.g., for bivariate case the surface can be tuned from a membrane to a thin steel plate), Tension can be applied also in a chosen direction, for modeling of phenomena with a simple type of anisotropy. The functions have regular derivatives of all orders everywhere. This makes them suitable for analysis of surface geometry and for direct application in models where derivatives are necessary. For processing of large datasets (thousands of data points), which are now common in geosciences, a segmentation algorithm with a flexible size of overlapping neighborhood is presented. Simple examples demonstrating flexibility and accuracy of the functions are presented.On leave from the Department of Physical Geography and Cartography, Comenius University, Mlynská dolina, Bratislava, Czechoslovakia.On leave from the Institute of Physics, Dúbravská cesta 9, Bratislava, Czechoslovakia. 相似文献
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This article characterizes the atlas prepared at the Faculty of Geography, Moscow State University; 87 mouths of the largest
world rivers are presented in space images. The atlas has 325 pages, 95 maps, 425 images and six printer’s sheets of explanatory
text. The atlas is based on space images in the Internet galleries with data representation at different territorial levels
(river mouth area-delta, estuary or their complex-typical delta reaches). The atlas shows specific features of river mouth
areas, their hydrological and morphological structure, including estuaries and river deltas, their long-term and seasonal
dynamics, landscapes and delta land use, hydraulic structures in deltas, ports, cultural and historical monuments, as well
as recreation objects. 相似文献
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Sotnikov N. V. Antonova E. E. Ryazantseva M. O. Barinova V. O. Rubinshtein I. A. Mit’ S. K. 《Geomagnetism and Aeronomy》2019,59(2):136-146
Geomagnetism and Aeronomy - This paper studies the position of the trapping boundary of electrons with energies of >100 keV relative to the equatorial boundary of the auroral oval during a... 相似文献
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A. G. Mironov S. M. Zhmodik G. M. Kolesov V. N. Mit’kin B. B. Damdinov S. B. Zayakina 《Geology of Ore Deposits》2008,50(1):41-59
The concentration levels and distribution features of the platinum group elements (PGE) in quartz-sulfide and base-metal ores in deposits of the Sayan-Baikal Fold Region (SBFR) are discussed. Microfire assay neutron activation analysis (MF-NAA), which enables one to work on a nondestructive basis and allows one to avoid inaccuracies related to chemical sample preparation, was used as the main analytical technique. Three types of hydrothermal mineralization with elevated grades of PGE (especially Pt, Pd, and Ru) have been identified: (1) pyrite-pyrrhotite (massive sulfide) mineralization hosted in black shales of the Il’chir Sequence; (2) gold-sulfide ores of the Zun-Kholba, Tainsky, Kamenny, and some other gold deposits; and (3) silver-basemetal ores of the Dzhida-Vitim Zone. The PGE contents significantly vary, from global average values to tens of grams per ton. An absence of PGE minerals implies that these elements are finely dispersed in sulfide minerals and native gold. Taking into account difficulties in conversion of PGE into analytical forms, their nonuniform distribution in sulfide minerals, their high affinity to coordination compounds, and experimental results, cluster species of Pt and Pd in major minerals are suggested for the gold-sulfide and silver-base-metal ores in deposits, which are related to suprasubduction ophiolites and island-arc and intraplate settings in the SBFR. 相似文献
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Jaroslav Hofierka Juraj Parajka Helena Mitasova & Lubos Mitas 《Transactions in GIS》2002,6(2):135-150
Regularized Spline with Tension (RST) is an accurate, flexible and efficient method for multivariate interpolation of scattered data. This study evaluates its capabilities to interpolate daily and annual mean precipitation in regions with complex terrain. Tension, smoothing and anisotropy parameters are optimized using the cross-validation technique. In addition, smoothing and rescaling of the third variable (elevation) is used to minimize the predictive error. The approach is applied to data sets from Switzerland and Slovakia and interpolation accuracy is compared to the results obtained by several other methods, expert-drawn maps and measured runoff. The results demonstrate that RST performs as well or better than the methods tested in the literature. The incorporation of terrain improves the spatial model of precipitation in terms of its predictive error, spatial pattern and water balance. 相似文献
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A central depository for meteor orbits obtained by photographic techniques, as a part of the IAU Meteor Data Center, was moved
to the Astronomical Institute of the Slovak Academy of Sciences in Bratislava in 2001. The current version of the catalogue
contains data on 4581 meteor orbits obtained by 17 different stations or groups from the period 1936 to 1996. Since 1996 a
few huge campaigns were organised including very successful Leonids and Perseids. That is why we would prepare a new more
complete version of the database. The main aim of this paper is a call to the observers of meteors having new or recalculated/remeasured
data on photographic meteors to send them to the MDC, where after a check and consultations with the observer, the orbits
will be included in the database. 相似文献
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Seit der Publikation der Arbeit von Dr.S.S.Yoh(1933 a.a.0.)wurdendie Kohlenf(o|¨)hrenden Schichten in Hsiwan~1 im allgemeinen als Unter-karbon oder Kulm angeh(o|¨)rig betrachtet.So hat auch der Verfasser vor 相似文献
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Sotnikov N. V. Antonova E. E. Riazantseva M. O. Ovchinnikov I. L. Rubinstein I. A. Barinova V. O. Mit’ S. K. 《Geomagnetism and Aeronomy》2019,59(6):651-659
Geomagnetism and Aeronomy - Variations in the spectra and pitch-angle distribution of relativistic electrons are studied for the large magnetic storm on December 19–22, 2015, during which the... 相似文献
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