IEEE International Geoscience and Remote Sensing Symposium

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Effects of temperature and moisture of snow and soil on SSM/I response to snow
IEEE International Geoscience and Remote Sensing Symposium - Tập 1 - Trang 680-682 vol.1
M. Hallikainen, P. Halme, M. Takala, J. Pulliainen
The response of the SSM/I microwave radiometer to snow-covered terrain in Finland is investigated using data for the winters of 1996-97, 1997-98, and 1998-99. The effect of temperature to the brightness temperature of dry snow is examined and a method is proposed to reduce snow/soil temperature-caused fluctuations in the brightness temperature. The feasibility of the method is verified.
#Snow #Moisture #Soil #Testing #Brightness temperature #Space technology #Microwave radiometry #Satellite broadcasting #Microwave technology #Laboratories
The Global Hawk UAV Australian deployment: imaging radar sensor modifications and employment for maritime surveillance
IEEE International Geoscience and Remote Sensing Symposium - Tập 2 - Trang 699-701 vol.2
N.J.S. Stacy, D.W. Craig, J. Staromlynska, R.B. Smith
The Global Hawk system is a high altitude endurance unmanned aerial vehicle developed under the United States Air Force Advanced Concept Demonstrator program primarily as a reconnaissance system for use against fixed and mobile targets. The Global Hawk system deployed to Australia in April 2001 for six weeks and in this period conducted 11 missions with the focus on maritime surveillance. The Aust...... hiện toàn bộ
#Unmanned aerial vehicles #Australia #Radar imaging #Image sensors #Employment #Surveillance #Reconnaissance #Sensor systems #Force sensors #Collaboration
Sea ice microstructural characteristics in the Barents Sea in autumn: relevance to microwave remote sensing
IEEE International Geoscience and Remote Sensing Symposium - Tập 4 - Trang 2176-2178 vol.4
T. Maksym, M. Van Woert, W. Dierking, S.V. Nghiem
The microstructural characteristics of sea ice during autumn freeze-up in the Barents Sea were measured during a microwave remote sensing validation campaign aboard the US Coast Guard icebreaker Healy during October-November 2001. Ice samples were obtained from 16 ice floes and digital images of the thin and thick sections were taken to examine the characteristics of the brine and void structure. ...... hiện toàn bộ
#Sea ice #Electromagnetic heating #Geometry #Remote sensing #Electromagnetic scattering #Microstructure #Ice thickness #Backscatter #Ocean temperature #Shape
Sea-surface temperature measured by the Moderate Resolution Imaging Spectroradiometer (MODIS)
IEEE International Geoscience and Remote Sensing Symposium - Tập 2 - Trang 1177-1179 vol.2
P.J. Minnett, R.H. Evans, E.J. Kearns, O.B. Brown
The Moderate Resolution Imaging Spectroradiometer (MODIS) on the NASA Earth Observing System satellites Terra and Aqua include infrared bands that are designed for the accurate measurement of sea-surface temperature (SST). In addition to the conventional 'split-window' bands in the 10-12 /spl mu/m atmospheric window (similar in spectral properties to the corresponding channels of the heritage inst...... hiện toàn bộ
#Temperature measurement #MODIS #Atmospheric measurements #Radiometry #NASA #Earth Observing System #Satellite broadcasting #Infrared imaging #Infrared spectra #Instruments
Incidence angle dependence of the mean C-band HH-polarization backscattering signatures of the Baltic Sea ice
IEEE International Geoscience and Remote Sensing Symposium - Tập 3 - Trang 1518-1520 vol.3
M. Makynen, T. Manninen, M. Simila, J. Karvonen, M. Hallikainen
RADARSAT ScanSAR Narrow images are currently utilized operationally by Finnish Ice Service to monitor Baltic Sea ice conditions. Automatic identification of different ice types and open water in the SAR images is studied by the Finnish Institute of Marine Research (FIMR). Successful implementation of the classification algorithms is complicated due to the significant changes in backscattering leve...... hiện toàn bộ
#Backscatter #Snow #Radar measurements #Sea measurements #Sea ice #Spaceborne radar #Space technology #Rough surfaces #Surface roughness #Sea surface
Speckle reduction of SAR images in the curvelet domain
IEEE International Geoscience and Remote Sensing Symposium - Tập 1 - Trang 315-317 vol.1
M.O. Ulfarsson, J.R. Sveinsson, J.A. Benediktsson
Curvelet transform (CT), proposed by E. Candes et al. (1999), is used for speckle reduction of SAR images. The CT is useful for speckle reduction through its subband images and the speckle reduction is obtained by thresholding the subband-image coefficients of the digitized SAR images. Two thresholding methods are used; hard thresholding and soft thresholding. The denoising method shows great prom...... hiện toàn bộ
#Speckle #Noise reduction #Wavelet transforms #Discrete wavelet transforms #Continuous wavelet transforms #Computed tomography #Additive noise #Wavelet coefficients #Wavelet domain #Chaos
The Canadian Cryospheric Information Network: facilitating access to sea ice, lake ice, snow cover, permafrost, and glacier data
IEEE International Geoscience and Remote Sensing Symposium - Tập 1 - Trang 214-216 vol.1
J.M. Piwowar, E.F. LeDrew, R. Brown, B.E. Goodison, M. Polanski, T. Hirose
The cryosphere - sea ice, lake ice, snow cover, frozen ground, and glaciers - plays a significant role in the Earth's climate system. Canada occupies a unique geographic position on the globe: almost half of the planet's northern cryosphere falls within Canada's territorial boundaries. Under the current conditions of rapid climate change over northern high latitudes, Canada has an obligation to me...... hiện toàn bộ
#Sea ice #Lakes #Snow #Government #Meteorology #Monitoring #Remote sensing #Geography #Current measurement #Extraterrestrial measurements
Assimilation of space-borne microwave radiometer and discrete ground-based data in snow depth mapping: a case study for northern Eurasia
IEEE International Geoscience and Remote Sensing Symposium - Tập 1 - Trang 689-691 vol.1
J. Pulliainen, M. Takala, M. Hallikainen
A new technique to retrieve snow depth (SD) information by assimilating time series of passive microwave radiometer data to SD estimates interpolated from discrete ground-based observations is presented. The technique is based on Bayesian (statistical) inversion of an analytical brightness temperature model. The data assimilation is demonstrated for the boreal forests and sub-arctic regions of Eur...... hiện toàn bộ
#Microwave radiometry #Snow #Brightness temperature #Data assimilation #Testing #Space technology #Information retrieval #Analytical models #Remote monitoring #Satellite broadcasting
A study of radar backscattering on multi-scale bi-dimensional rough surfaces
IEEE International Geoscience and Remote Sensing Symposium - Tập 1 - Trang 659-661 vol.1
L. Bennaceur, Z. Belhadj, M.R. Boussema
The principal objective of the present work is to find an adequate description of natural rough surfaces in order to study backscattering from these surfaces and try in a future work to retrieve soil characteristic parameters. Previous work has shown the inadequacy of the classical description which considered rough surfaces as stationary random Gaussian processes. They proposed a multi-scale surf...... hiện toàn bộ
#Backscatter #Rough surfaces #Surface roughness #Random processes #Integral equations #Fractals #Wavelet transforms #Gaussian processes #Radar remote sensing #Remote sensing
Comparison of microwave scattering models for leaf
IEEE International Geoscience and Remote Sensing Symposium - Tập 1 - Trang 653-655 vol.1
G. Pan, R.M. Narayanan
The Generalized Rayleigh-Gans (GRG) approach is used for the scattering cross section computation of leaves at low frequencies, while the Physical Optics (PO) approach is employed at high frequencies. In this paper, the magnitude of the scattering amplitude of the leaf is calculated using the two analytical methods (GRG PO) at different frequencies (i.e., L, C and X bands) and with different leaf ...... hiện toàn bộ
#Optical scattering #Rayleigh scattering #Electromagnetic scattering #Radar scattering #Frequency #Physical optics #Shape #Optical surface waves #Message-oriented middleware #Optical computing
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