Three‐dimensional terrain modeling with multiple‐source illumination     

I. V. Florinsky  S. V. Filippov 《Transactions in GIS》2019,23(5):937-959

Three‐dimensional (3D) terrain modeling based on digital elevation models (DEMs) with the use of orthographic and perspective projections is a standard procedure implemented in many commercial and open‐source geoinformation systems. However, standard tools may be insufficient for 3D scientific visualization. In particular, single‐source illumination of 3D models may be deficient for topographically complex terrains. We present an approach for 3D terrain modeling with multiple‐source illumination in the virtual environment of the Blender free and open‐source software. The approach includes the following key stages: (1) automatic creation of a polygonal object; (2) selecting an algorithm to model the 3D geometry; (3) selecting a vertical exaggeration scale; (4) selecting types, parameters, a number, and positions of light sources; (5) selecting methods for generating shadows; (6) selecting a shading method for the 3D model; (7) selecting a material for the 3D model surface; (8) overlaying a texture on the 3D model; (9) setting a virtual camera; and (10) rendering the 3D model. To illustrate the approach, we processed a test DEM extracted from the International Bathymetric Chart of the Arctic Ocean version 3.0 (IBCAO 3.0). The approach is currently being used to develop a system for geomorphometric modeling of the Arctic Ocean floor.  相似文献   

Multidisciplinary studies of the separating lakes at different stage of isolation from the White Sea performed in March 2012   总被引：1，自引：0，他引：1  

E. D. Krasnova  A. N. Pantyulin  T. A. Belevich  D. A. Voronov  N. A. Demidenko  L. S. Zhitina  L. V. Ilyash  N. M. Kokryatskaya  O. N. Lunina  M. V. Mardashova  A. A. Prudkovsky  A. S. Savvichev  A. S. Filippov  V. P. Shevchenko 《Oceanology》2013,53(5):639-642

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Cambrian section in the east of the West Siberian geosyneclise (based on data from Vostok 4 well)     

A.E. Kontorovich  V.A. Kontorovich  I.V. Korovnikov  S.V. Saraev  N.V. Sennikov  Yu.F. Filippov  A.I. Varlamov  A.S. Efimov  Yu.A. Filiptsov  A.A. Postnikov  A.A. Terleev  G.A. Karlova  K.E. Nagovitsin  D.A. Tokarev  T.P. Baturina  I.A. Gubin  B.B. Kochnev  N.V. Novozhilova  V.A. Luchinina 《Russian Geology and Geophysics》2012,53(10):972-981

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Systematics of Th,Cr, Hf,Co, and rare-earth elements in modern bottom sediments of the white sea and lower reaches of the Severnaya Dvina River     

A.?V.?MaslovEmail author  V.?P.?Shevchenko  Yu.?L.?Ronkin  O.?P.?Lepikhina  A.?N.?Novigatskii  A.?S.?Filippov  N.?V.?Shevchenko 《Doklady Earth Sciences》2012,443(1):371-376

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Deflection of Coronal Rays by Remote CMEs: Shock Wave or Magnetic Pressure?     

Boris Filippov  A. K. Srivastava 《Solar physics》2010,266(1):123-134

We analyze five events of the interaction of coronal mass ejections (CMEs) with the remote coronal rays located up to 90° away from the CME as observed by the SOHO/LASCO C2 coronagraph. Using sequences of SOHO/LASCO C2 images, we estimate the kink propagation in the coronal rays during their interaction with the corresponding CMEs ranging from 180 to 920 km s⁻¹ within the interval of radial distances from 3 R _⊙ to 6 R _⊙. We conclude that all studied events do not correspond to the expected pattern of shock wave propagation in the corona. Coronal ray deflection can be interpreted as the influence of the magnetic field of a moving flux rope within the CME. The motion of a large-scale flux rope away from the Sun creates changes in the structure of surrounding field lines, which are similar to the kink propagation along coronal rays. The retardation of the potential should be taken into account since the flux rope moves at a high speed, comparable with the Alfvén speed.  相似文献   

Multiwavelength Study of the M8.9/3B Solar Flare from AR NOAA 10960     

Pankaj Kumar  A. K. Srivastava  B. Filippov  Wahab Uddin 《Solar physics》2010,266(1):39-58

We present a multiwavelength analysis of a long-duration, white-light solar flare (M8.9/3B) event that occurred on 04 June 2007 from AR NOAA 10960. The flare was observed by several spaceborne instruments, namely SOHO/MDI, Hinode/SOT, TRACE, and STEREO/SECCHI. The flare was initiated near a small, positive-polarity, satellite sunspot at the center of the active region, surrounded by opposite-polarity field regions. MDI images of the active region show a considerable amount of changes in the small positive-polarity sunspot of δ configuration during the flare event. SOT/G-band (4305 Å) images of the sunspot also suggest the rapid evolution of this positive-polarity sunspot with highly twisted penumbral filaments before the flare event, which were oriented in a counterclockwise direction. It shows the change in orientation, and also the remarkable disappearance of twisted penumbral filaments (≈35?–?40%) and enhancement in umbral area (≈45?–?50%) during the decay phase of the flare. TRACE and SECCHI observations reveal the successive activation of two helically-twisted structures associated with this sunspot, and the corresponding brightening in the chromosphere as observed by the time-sequence of SOT/Ca?ii H line (3968 Å) images. The secondary, helically-twisted structure is found to be associated with the M8.9 flare event. The brightening starts six?–?seven minutes prior to the flare maximum with the appearance of a secondary, helically-twisted structure. The flare intensity maximizes as the secondary, helically-twisted structure moves away from the active region. This twisted flux tube, associated with the flare triggering, did not launch a CME. The location of the flare activity is found to coincide with the activation site of the helically-twisted structures. We conclude that the activation of successive helical twists (especially the second one) in the magnetic-flux tubes/ropes plays a crucial role in the energy build-up process and the triggering of the M-class solar flare without a coronal mass ejection (CME).  相似文献   

Manifestation of marine and riverine factors in the tide and ebb phases along the white sea coasts of different configuration     

Yu. S. Dolotov  N. N. Filatov  N. A. Rimsky-Korsakov  R. E. Zdorovennov  A. A. Pronin  A. V. Tolstikov  A. S. Filippov  E. A. Novichkova  I. P. Kutcheva  V. P. Shevchenko 《Oceanology》2011,51(1):105-117

The peculiarities of the distributional patterns of the water temperature, salinity, current velocities, particulate matter concentration, bottom contour, and zooplankton abundance were studied in relation to the marine-riverine interactions and tide/ebb phases for coast lines of different configurations in the White Sea during the cruises of the R/V Ekolog (August of 2006 and 2007). A significant difference in the manifestation of the combined effect of the marine and riverine impacts (the estuarine concave relief) and only the marine impact (the open-sea straight-line portion) was observed, which results in both variations in the sea water level and the distributional patterns of the suspended matter and the zooplankton.  相似文献   

New finds of middle and late jurassic radiolarians in the siliceous-clayey and clastic rocks of the Nadan’khada-Bikin terrane (Jurassic accretionary wedge, western Sikhote Alin) and their geological significance     

I. V. Kemkin  A. N. Filippov 《Russian Journal of Pacific Geology》2011,5(6):518-530

The lithostratigraphic analysis of the paleo-oceanic sediments in the Bikin segment of the Nadan’khada-Bikin terrane of the Jurassic accretionary wedge revealed late Bajocian and early to middle Bathonian radiolarians in the siliceous-clayey rocks constituting its southern part in the Perepelinaya-Cheremshanka and Kedrovka areas. Siltstones from the central part of the Bikin segment in the upper reaches of the Vasil’eka River contain radiolarians of the terminal late Tithonian age. Combined with the known dates available for siliceous-clayey rocks from the western part of the Nadan’khada Alin Range and the Ulitka-Zolotoi Klyuch area, these data made it possible to define three stages in the formation of the Bikin segment of the Nadan’khada-Bikin terrane of the accretionary wedge: the terminal Middle Jurassic, the late Tithonian, and the Berriasian. The formation of this segment lasted approximately 25 Ma.  相似文献   

Spatial and temporal variability in suspended particulate matter concentration within the active layer of the White Sea     

A. P. Lisitzyn  M. D. Kravchishina  O. V. Kopelevich  V. I. Burenkov  V. P. Shevchenko  S. V. Vazyulya  A. A. Klyuvitkin  A. N. Novigatskii  N. V. Politova  A. S. Filippov  S. V. Sheberstov 《Doklady Earth Sciences》2013,453(2):1228-1233

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Analysis of the landscape structure in the tundra zone for western Siberia based on satellite data     

L. L. Golubyatnikov  E. A. Zarov  V. S. Kazantsev  I. V. Filippov  G. O. Gavrilov 《Izvestiya Atmospheric and Oceanic Physics》2015,51(9):969-978

The landscape structure are investigated for typical and southern tundra subzones of western Siberia based on satellite images from Landsat and WorldView. The microlandscape types for the considered regions are selected and areas of microlandscapes are defined on the basis of satellite information and accounting data of field studies. The areas of the main wetland landscapes in the different types of bogs in northwestern Siberia are defined.  相似文献