Exploiting IKONOS and Hyperion data fusion for automated road extraction     

Poonam S. Tiwari  Hina Pande  Mya Nan Aye 《国际地球制图》2013,28(2):123-131

We present here the examples that show how fusing data from hyperspectral sensors with data from high spatial resolution sensors can enhance overall road detection accuracy. The fusion of hyperspectral and high spatial resolution data combines their superior respective spectral and spatial information. IKONOS (MSS) and Hyperion images were fused using the principal component analysis (PCA) method. The approach for road extraction integrates multiresolution segmentation and object oriented classification. Road extraction is done from an IKONOS (MSS) image and a Hyperion and IKONOS (MSS) merged image and comparisons are made depending on accuracy and quality measures such as completeness and correctness. This article also emphasises the types of roads which are giving better accuracy of extraction after fusion with hyperspectral image. This can vary because of types of material and condition of roads. The methodology was applied on roads of Dehradun, India.  相似文献   

Hazard warnings and responses to evacuation orders: the case of Bangladesh's cyclone Sidr   总被引：2，自引：0，他引：2  

Paul BK  Dutt S 《Geographical review》2010,100(3):336-355

On 15 November 2007 Cyclone Sidr, a category 4 storm, struck the southwestern coast of Bangladesh. Despite early cyclone warnings and evacuation orders for coastal residents, thousands of individuals stayed in their homes. This study examines dissemination of the warning, assesses the warning responses, and explores the reasons why many residents did not evacuate. Field data collected from 257 Sidr survivors in four severely affected coastal districts revealed that more than three-fourths of all respondents were aware of the cyclone warnings and evacuation orders. Despite the sincere efforts of the Bangladesh government, however, lapses in cyclone warnings and evacuation procedures occurred. Field data also revealed several reasons why evacuation orders were not followed. The reasons fell into three broad groups: those involving shelter characteristics; the attributes of the warning message itself; and the respondents' characteristics. Based on our findings, we recommend improved cyclone warnings and utilization of public shelters for similar events in the future.  相似文献   

Laboratory technique for quantitative thermal emissivity measurements of geological samples     

George Mathew  Archana Nair  T. K. Gundu Rao  Kanchan Pande 《Journal of Earth System Science》2009,118(4):391-404

Thermal infrared spectroscopy is a powerful technique for the compositional analysis of geological materials. The spectral feature in the mid-IR region is diagnostic of the mineralogy and spectral signatures of mixtures of minerals that add linearly, and therefore, can be used as an important tool to determine the mineralogy of rocks in the laboratory and remotely for planetary exploration. The greatest challenge in the emission measurement lies in the measurement of the weak thermal photons emitted from geological materials in a laboratory setup, and accurately records the temperature of the rock sample. The present work pertains to the details of a new Thermal Emission Spectrometer (TES) laboratory that has been developed under the ISRO Planetary Science and Exploration (PLANEX) programme, for emission related mineralogical investigations of planetary surfaces. The focus of the paper is on the acquisition and calibration technique for obtaining emissivity, and the deconvolution procedure to obtain the modal abundances of the thermal emission spectra in the range of 6–25 μm using Fourier Transform Infrared (FTIR) spectroscopy. The basic technique is adopted from the work of Ruff et al (1997). This laboratory at the Department of Earth Sciences, IIT-Bombay is currently developing pure end mineral library of mineral particulates (<65 μm), and adding new end members to the existing ASU spectral library. The paper argues the need for considering Lunar Orbiter Thermal Emission Spectrometer (LOTES) for future Indian Moon mission programme (Chandrayan-II) to determine evidences of varied lithologies on the lunar surface.  相似文献   

On the O2 Schumann-Runge band system in sunspots     

G. C. Joshi  L. M. Punetha  M. C. Pande 《Solar physics》1979,63(1):79-81

The visibility in the umbral ultraviolet spectrum of the O₂ Schumann-Runge absorption band system has been explored. It is found that the band system may be visible in high dispersion sunspot spectrum.  相似文献   

Absolute age determinations of crystalline rocks of Manali-Jaspa region,Northwestern Himalaya     

Dr. I. C. Pande  Dr. Surendar Kumar 《International Journal of Earth Sciences》1974,63(2):539-548

Comparison of “argon” absolute age determinations of crystalline rocks of the “Crystalline Nappe” (Kumar, 1971, unpublished Ph. D. thesis) and of the “root-zone” (Jaspa granite) has led to an important conclusion concerning the interpretation of the development of the “crystalline nappe” and its rejuvenation.  相似文献   

Age and duration of the Deccan Traps, India: A review of radiometric and paleomagnetic constraints     

Kanchan Pande 《Journal of Earth System Science》2002,111(2):115-115

A review of the available radiometric and paleomagnetic data from the Deccan Flood Basalt Province (DFBP) suggests that the volcanism was episodic in nature and probably continued over an extended duration from 69 Ma to 63 Ma between 31R and 28N. It is likely that the most intense pulse of volcanism at 66.9 ± 0.2 Ma preceded the Cretaceous Tertiary Boundary (KTB, 65.2 ± 0.2Ma) events by R∼1.7Ma. The magnetostratigraphic record in the Deccan lava pile is incomplete and it is therefore possible that the lava flows constituting the reverse polarity sequence were erupted in more than one reversed magnetic chron.  相似文献   

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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Preface     

Hetu Sheth  Kanchan Pande 《Journal of Earth System Science》2004,113(4):517-518

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Commentary on Kearns's “Place and Health: Toward a Reformed Medical Geography”     

Bimal Kanti Paul 《The Professional geographer》1994,46(4):504-505

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On the periodic solutions and resonance of spinning satellites in near-circular orbits     

Modi  V. J.  Pande  K. C. 《Celestial Mechanics and Dynamical Astronomy》1975,11(2):195-212

Attitude motion of spinning axisymmetric satellites in presence of gravity-gradient and solar radiation pressure torques is studied analytically. The approximate closed-form solution developed for the nonlinear, nonautonomous, coupled fourth-order system proves to be an excellent tool in locating periodic solutions of the system in both circular and noncircular orbits. The variational stability of the periodic motion is examined using the Floquet theory. The resonance analysis suggests the existence of critical combinations of system parameters leading to large amplitude oscillations.

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