Stereo pairs in Astrophysics   总被引：1，自引：0，他引：1  

Frédéric Vogt  Alexander Y. Wagner 《Astrophysics and Space Science》2012,337(1):79-92

Stereoscopic visualization is seldom used in Astrophysical publications and presentations compared to other scientific fields, e.g., Biochemistry, where it has been recognized as a valuable tool for decades. We put forth the view that stereo pairs can be a useful tool for the Astrophysics community in communicating a truer representation of astrophysical data. Here, we review the main theoretical aspects of stereoscopy, and present a tutorial to easily create stereo pairs using Python. We then describe how stereo pairs provide a way to incorporate 3D data in 2D publications of standard journals. We illustrate the use of stereo pairs with one conceptual and two Astrophysical science examples: an integral field spectroscopy study of a supernova remnant, and numerical simulations of a relativistic AGN jet. We also use these examples to make the case that stereo pairs are not merely an ostentatious way to present data, but an enhancement in the communication of scientific results in publications because they provide the reader with a realistic view of multi-dimensional data, be it of observational or theoretical nature. In recognition of the ongoing 3D expansion in the commercial sector, we advocate an increased use of stereo pairs in Astrophysics publications and presentations as a first step towards new interactive and multi-dimensional publication methods.  相似文献   

A novel soil moisture‐based drought severity index (DSI) combining water deficit magnitude and frequency          下载免费PDF全文

Carmelo Cammalleri  Fabio Micale  Jürgen Vogt 《水文研究》2016,30(2):289-301

A correct identification of drought events over vegetated lands can be achieved by detecting those soil moisture conditions that are both unusually dry compared with the ‘normal’ state and causing severe water stress to the vegetation. In this paper, we propose a novel drought index that accounts for the mutual occurrence of these two conditions by means of a multiplicative approach of a water deficit factor and a dryness probability factor. The former quantifies the actual level of plant water stress, whereas the latter verifies that the current water deficit condition is unusual for the specific site and period. The methodology was tested over Europe between 1995 and 2012 using soil moisture maps simulated by Lisflood, a distributed hydrological precipitation–runoff model. The proposed drought severity index (DSI) demonstrates to be able to detect the main drought events observed over Europe in the last two decades, as well as to provide a reasonable estimation of both extension and magnitude of these events. It also displays an improved adaptability to the range of possible conditions encountered in the experiment as compared with currently available indices based on the sole magnitude or frequency. The results show that, for the analyzed period, the most extended drought events observed over Europe were the ones in Central Europe in 2003 and in southern Europe in 2011/2012, while the events affecting the Iberian Peninsula in 1995 and 2005 and Eastern Europe in 2000 were among the most severe ones. © 2015 European Commission ‐ Joint Research Centre. Hydrological Processes published by John Wiley & Sons Ltd.  相似文献   

Geologisches wörterbuch. 6. ergänzte und erweiterte auflage. erklärung der geologischen fachausdrücke der deutschen literatur: Murawski,Hans (1972): 260 S., 65 Abb, 1 Falttafel, 8 Tab. Stuttgart: Ferdinand Enke Verlag. DM 11,80     

Henri Vogt 《Geoforum》1973,4(1):98-99

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Deriving drainage networks and catchment boundaries: a new methodology combining digital elevation data and environmental characteristics   总被引：3，自引：0，他引：3  

Jürgen V. Vogt  Roberto Colombo  Francesca Bertolo   《Geomorphology》2003,53(3-4):281-298

Digital data on the position and characteristics of river networks and catchments are important for the analysis of pressures and impacts on water resources. GIS tools allow for the combined analysis of digital elevation data and environmental parameters in order to derive this kind of information. This article presents a new approach making use of medium-resolution digital elevation data (250-m grid cell size) and information on climate, vegetation cover, terrain morphology, soils and lithology to derive river networks and catchments over extended areas.In general, methods to extract channel networks at small scale use a constant threshold for the critical contributing area, independent of widely varying landscape conditions. As a consequence, the resulting drainage network does not reflect the natural variability in drainage density. To overcome this limitation, a classification of the landscape is proposed. The various data available are analysed in an integrated approach in order to characterise the terrain with respect to its ability to develop lower or higher drainage densities, resulting in five landscape types. For each landscape type, the slope–area relationship is then derived and the critical contributing area is determined. In the subsequent channel extraction, a dedicated critical contributing area threshold is used for each landscape type.The described methodology has been developed and tested for the territory of Italy. Results have been validated comparing the derived data with river and catchment data sets from other sources and at varying scales. Good agreement both in terms of river superimposition and drainage density could be demonstrated.  相似文献   

THE COMPILATION OF A DTM AND A NEW SATELLITE IMAGE MAP FOR KING GEORGE ISLAND,ANTARCTICA     

Matthias Braun  Jefferson Cardia Sim“非汉字符号”es  N.Blindow  Steffen Vogt  U.F.Bremer  M.Pfender  H.Saurer  F.E.Aquino  F.A.Ferron 《地球空间信息科学学报》2001,4(2):47-51

1　ＩｎｔｒｏｄｕｃｔｉｏｎＡｔｐｒｅｓｅｎｔ,ＫｉｎｇＧｅｏｒｇｅＩｓｌａｎｄ (ＫＧＩ)ｉｓｏｎｅｏｆｔｈｅｍｏｓｔｆｒｅｑｕｅｎｔｅｄｓｉｔｅｓｉｎＡｎｔａｒｃｔｉｃａ .Ｉｎｔｏｔａｌ,9ｐｅｒｍａｎｅｎｔｒｅｓｅａｒｃｈｓｔａｔｉｏｎｓａｒｅｉｎｏｐｅｒａｔｉｏｎａｎｄｓｅｖｅｒａｌｒｅｓｅａｒｃｈｃａｂｉｎｓｈａｖｅｂｅｅｎｃｏｎｓｔｒｕｃｔｅｄ .ＤｕｅｔｏｔｈｅｅａｓｙａｃｃｅｓｓｖｉａｔｈｅＣｈｉｌｅａｎａｉｒｓｔｒｉｐｔｈｅｎｕｍ ｂｅｒｏｆｔｈｅｉｓｌａｎｄ’ｓｉｎｈａｂｉｔａｎｔｓｒ…  相似文献   

The Canada Basin: Aeromagnetic constraints on structure and evolution     

P.R. Vogt  P.T. Taylor  L.C. Kovacs  G.L. Johnson 《Tectonophysics》1982,89(1-3)

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Changes in geomagnetic reversal frequency at times of tectonic change: Evidence for coupling between core and upper mantle processes     

Peter R. Vogt 《Earth and Planetary Science Letters》1975,25(3):313-321

Coincidence of major plate tectonic changes about 42–45, 70–80, and 110–120 m.y. B.P. with changes in geomagnetic reversal frequency provides support for previous suggestions that processes in the upper mantle and those in the outer core are somehow coupled.  相似文献   

Morphology of the Northeastern Atlantic and Labrador Sea     

G. L. Johnson  P. R. Vogt  E. D. Schneider 《Ocean Dynamics》1971,24(2):49-73

Summary Recent surveys by the US Naval Oceanographic Office have added greatly to the knowledge of the primary and secondary processes which have created the present morphology of the northeastern Atlantic and Labrador Sea.Primary processes are directly attributed to the generation of oceanic crust at the axis of the Mid-Oceanic Ridge. Shifting orientations of the axis have produced three differently oriented discrete stripes of oceanic crust since 60 million years ago. Evidence suggests a yet older axis may have been responsible for the opening of the Labrador Sea-Bay of Biscay in the early Mesozoic. Secondary processes have and are still modifying the igneous crust. The prime agent is a strong thermo-haline circulation which is piling up sediment into great plumes in some areas and eroding in other locales.

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Morphologie des Nordost-Atlantik und der Labrador-See

Zusammenfassung Vermessungen, die kürzlich vom U.S. Naval Oceanographic Office durchgeführt worden sind, haben sehr dazu beigetragen, das Wissen über die primären und sekundären Prozesse zu erweitern, die die derzeitige Morphologie des nordöstlichen Teiles des Atlantischen Ozeans und der Labrador-See geschaffen haben.Primäre Prozesse werden direkt der Entstehung von ozeanischer Kruste an der Achse des Mittelatlantischen Rückens zugeschrieben. Wechselnde Richtungen der Achse haben drei verschieden orientierte getrennte Streifen ozeanischer Kruste seit 60 Millionen Jahren hervorgebracht. Der Augenschein läßt vermuten, daß eine noch ältere Achse verantwortlich gewesen sein kann für das Öffnen zwischen Labrador-See und Biscaya Bucht im frühen Mesozoikum. Sekundäre Prozesse haben die vulkanische Kruste verändert und tun dieses noch. Die Hauptwirkungskraft ist eine starke thermo-haline Zirkulation, die in manchen Gebieten Ablagerungen in großen Streifen aufhäuft und an anderen Stellen Erosionen verursacht.

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Morphologie de l'Atlantique Nord-Est et de la Mer du Labrador

Résumé De récentes explorations effectuées par l'U.S. Naval Océanographic Office ont grandement enrichi notre connaissance des processus primaire et secondaire qui sont à l'origine de la morphologie actuelle de l'Atlantique Nord-Est et de la mer du Labrador.Les processus primaires remontent directement à la création de croûte océanique dans l'axe de la chaîne océanique médiane. Des changements d'orientation de l'axe ont donné naissance à trois bandes discontinues, d'orientations différentes, de la croûte océanique depuis 60 millions d'années. On est en droit de penser qu'un axe, plus ancien encore, a provoqué l'ouverture mer du Labradorgolfe de Gascogne au messzoïque supérieur. Des processus secondaires ont modifié — et continuent de modifier — la croûte ignée. Le facteur le plus important est une forte circulation thermo-haline qui entasse les sédiments en grandes masses en certaines zones et, ailleurs, en entraîne l'érosion.

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Key site variables governing the functional characteristics of Dissolved Natural Organic Matter (DNOM) in Nordic forested catchments   总被引：1，自引：0，他引：1  

Rolf D. Vogt  Jarkko Akkanen  Dag Olav Andersen  Rainer Brüggemann  Bimal Chatterjee  Egil Gjessing  Jussi V. K. Kukkonen  Håkon E. Larsen  Jörg Luster  Andrea Paul  Stephan Pflugmacher  Mike Starr  Christian E. W. Steinberg  Philippe Schmitt-Kopplin  Ádám Zsolnay 《Aquatic Sciences - Research Across Boundaries》2004,66(2):195-210

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Fluid evolution,wallrock alteration,and ore mineralization associated with the Rodalquilar epithermal gold-deposit in southeast Spain   总被引：2，自引：0，他引：2  

P. Sänger-von Oepen  G. Friedrich  J. H. Vogt 《Mineralium Deposita》1989,24(4):235-243

At Rodalquilar gold mineralization is found in Late Tertiary volcanic rocks of the Sierra del Cabo de Gata and is related to a caldera collapse. Radial and concentric faults were preferred sites for gold deposition. Hydrothermal activity produced a specific alteration zoning around gold-bearing vein structures, grading from an innermost advanced argillic via an argillic into a more regionally developed propylitic zone. Advanced argillic alteration with silica, pyrophyllite, alunite, and kaolinite extends down to several hundred m indicating a hypogene origin. High-grade gold mineralization in vein structures is confined to the near-surface part of the advanced argillic alteration. Fine-grained gold is associated with hematite, jarosite, limonite, or silica. At a depth of about 120 m, the oxidic ore assemblage grades into sulfide mineralization with pyrite and minor chalcopyrite, covellite, bornite, enargite, and tennantite. Two types of fluids from different sources were involved in the hydrothermal system. Overpressured and hypersaline fluids of presumably magmatic origin initiated the hydrothermal system. Subsequent hydrothermal processes were characterized by the influx of low-salinity solutions of probable marine origin and by interactions between both fluids. Deep-reaching, advanced argillic alteration formed from high-salinity fluids with 20–30 equiv. wt% NaCl at about 225°C. Near-surface gold precipitation and silification are related to fluids with temperatures of about 175°C and 3–4 equiv. wt% NaCl. Gold was transported as Au(HS) ₂ ^– , and precipitation resulted from boiling with a concomitant decrease in temperature, pressure, and pH and an increase in fO₂. All features of the Rodalquilar gold deposit reveal a close relationship to acid-sulfate-type epithermal gold mineralization.  相似文献