Open source, spatial analysis, and activity-travel behaviour research: capabilities of the aspace package   总被引：2，自引：0，他引：2  

Ron N. Buliung  Tarmo K. Remmel 《Journal of Geographical Systems》2008,10(2):191-216

This paper reports on recent experience with the development of aspace, an Open Source (OS) library for the geographic visualization and analysis of activity-travel behaviour. The paper begins with an overview of recent progress with respect to the convergence of Open Source technology, spatial analysis, and travel behaviour research. The remainder of the paper focuses on aspace; a collection of functions that, when combined with data describing the geographical location of daily activities, can be used to visualize and describe spatial properties of individual and household activity spaces. These properties include: size, orientation, shape, and the geographical dispersion of activity locations contained within the activity space. Several planar geometries are used to transform measurable spatial properties into intuitive objects for visualizing spatial patterns of activity participation. Experiments are conducted, using data from the first wave of the 2003 Toronto Travel Activity Panel Survey, to demonstrate the potential application of aspace for basic and applied policy-based research into activity-travel behaviour. The toolkit is distributed as a downloadable ‘package’ from the Open Source R Project for Statistical Computing.   相似文献   

Using a Grid-Based Filter to Solve InSAR Phase Unwrapping     

Martinez-Espla  J.J. Martinez-Marin  T. Lopez-Sanchez  J.M. 《Geoscience and Remote Sensing Letters, IEEE》2008,5(2):147-151

This letter presents a phase-unwrapping (PU) algorithm for synthetic aperture radar interferometry based on a grid-based filter. The proposed PU algorithm, which is based on state-space techniques, simultaneously performs noise filtering and PU. The formulation of this technique provides independence from noise statistics and is not constrained by the nonlinearity of the problem. Results obtained with synthetic data show a significant improvement with respect to other conventional PU algorithms in some situations.  相似文献   

Secondary alterations of zircons in placers     

N. G. Patyk-Kara  E. A. Andrianova  V. T. Dubinchuk 《Doklady Earth Sciences》2008,419(2):253-256

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Sm-Nd and Rb-Sr age of gabbroic rocks in the Dzhabyk Batholith, the Southern Urals     

T. A. Osipova  Al. V. Tevelev  V. S. Popov  B. V. Belyatsky 《Doklady Earth Sciences》2008,419(2):275-280

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Microstructure and formation mechanism of calcium phosphate in recent phosphorites     

A. T. Titov  G. N. Baturin 《Doklady Earth Sciences》2008,419(2):312-315

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Formation conditions of copper porphyry mineralization in the Kadica-Bukovik ore district,eastern Macedonia     

A. V. Volkov  G. Tasev  V. Yu. Prokof’ev  T. Serafimovski  I. N. Tomson  A. A. Sidorov 《Doklady Earth Sciences》2008,421(1):769-773

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Structure features of convective channels from thermal sources in Mutnovskii volcano (South Kamchatka)     

Yu. A. Manshtein  S. B. Bortnikova  A. K. Manshtein  G. M. Gavrilenko  I. V. Vernikovskaya  N. P. Sez’ko 《Doklady Earth Sciences》2008,423(2):1404-1409

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Late Quaternary marine terraces in the Mediterranean coastal area of Syria: Geochronology and neotectonics     

A.E. Dodonov  V.G. Trifonov  T.P. Ivanova  V.Yu. Kuznetsov  F.E. Maksimov  D.M. Bachmanov  T.A. Sadchikova  A.N. Simakova  H. Minini  A.-M. Al-Kafri  O. Ali 《Quaternary International》2008,190(1):158

In order to provide new data on the neotectonics and geodynamic properties of western Syria, studies of marine terraces have been carried out. The most attention was paid to the lower terraces in the range of 3–5 to 30–35 m above sea level, because they have more complete distributions along the shore. The lower terraces were examined along the coastal area from Tartus to Latakia, and along the carbonate cliff on Arwad Island. Seven ²³⁰Th/U dates for these terraces are in the range of 85–130 ka, suggesting the age interval of the last interglacial (MIS 5). New dates on the lower terraces provide a basis for stratigraphical and geomorphological interpretation as well as neotectonic reconstruction. According to the geomorphological data and lithological composition of those terraces, two main uplifted blocks can be established. One coincides with the Latakia block, and another corresponds to the western margin of the Banias volcanic plateau. These blocks are divided by a subsided structure corresponding to the Nahr el Kebir graben. The amplitude of neotectonic uplifting in the Latakia and Banias blocks reaches 15–20 m for the Late Pleistocene.  相似文献   

Dependence of the water content in channels of the cordierite structure on the composition of its Fe-Mg solid solutions     

T. A. Bul’bak  S. V. Shvedenkova 《Doklady Earth Sciences》2008,419(2):477-480

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The structure of the tectonosphere of the Urals and West Siberian Platform by electromagnetic data     

A. G. D’yakonova  K. S. Ivanov  O. V. Surina  P. F. Astaf’ev  V. S. Vishnev  A. D. Konoplin 《Doklady Earth Sciences》2008,423(2):1479-1482

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