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# IEEE Geoscience and Remote Sensing Letters

## Filter Results

Displaying Results 1 - 25 of 61
• ### [Front cover]

Publication Year: 2009, Page(s): C1
| PDF (380 KB)
• ### IEEE Geoscience and Remote Sensing Letters publication information

Publication Year: 2009, Page(s): C2
| PDF (40 KB)

Publication Year: 2009, Page(s):361 - 362
| PDF (65 KB)
• ### Genetic-Algorithm-Based Parameter Estimation Technique for Fragmenting Radar Meteor Head Echoes

Publication Year: 2009, Page(s):363 - 367
Cited by:  Papers (11)
| | PDF (351 KB) | HTML

Meteoroid fragmentation presents a serious problem for Doppler estimation using Fourier transform techniques. Radar returns from multiple closely spaced bodies traveling at nearly identical speeds result in an interference pattern which makes it difficult to estimate properties of individual bodies by traditional techniques. Here, we present a genetic-algorithm-based procedure to determine the pro... View full abstract»

• ### Two-Dimensional Spectrum Matched Filter Banks for High-Speed Spinning-Target Three-Dimensional ISAR Imaging

Publication Year: 2009, Page(s):368 - 372
Cited by:  Papers (3)
| | PDF (408 KB) | HTML

In this letter, a 3-D inversed synthetic aperture radar imaging algorithm for targets in high-speed spinning is proposed based on 2-D spectrum matched filter (MF) banks. Each spectrum MF bank yields a focused slice for its corresponding scatterers. By extracting the spatial parameters from all slices, the 3-D image of the target can be constructed. Numeric simulation confirms the validity of the a... View full abstract»

• ### Evaluation of Precipitation Features in High-Frequency SSM/I Measurements Over Indian Land and Oceanic Regions

Publication Year: 2009, Page(s):373 - 377
Cited by:  Papers (3)
| | PDF (924 KB) | HTML

Evaluation of the Special Sensor Microwave Imager (SSM/I) precipitation features is presented from various passes over Indian oceanic and land regions under the framework of radiative transfer simulations for both emission and scattering atmospheres. There is considerable uncertainty in the interpretation of the SSM/I high-frequency scattering features for development of rainfall algorithms. Speci... View full abstract»

• ### Comparison of TRMM TMI and PR Version 5 and 6 Precipitation Data Products Under Cyclonic Weather Conditions

Publication Year: 2009, Page(s):378 - 382
Cited by:  Papers (2)
| | PDF (284 KB) | HTML

In 2004, the Tropical Rainfall Measuring Mission (TRMM) Science Project released a newer version of precipitation products, i.e., version 6 (V6), from its various instruments. The V6 data products are expected to be more accurate than the previous version 5 (V5). In this letter, we have attempted to analyze V5 and V6 products from two primary sensors on the TRMM, namely, the TRMM Microwave Imager ... View full abstract»

• ### Efficient Directional Gaussian Smoothers

Publication Year: 2009, Page(s):383 - 387
Cited by:  Papers (7)
| | PDF (267 KB) | HTML

Linear and nonlinear filters, including morphological operators, play a significant role in the processing of remote sensing imagery. In particular, smoothing filters have been extensively used for noise removal and image restoration. In applications where linear and shift-invariant filters can be effectively employed, filtering is computationally efficient if implemented in transform domains. Nev... View full abstract»

• ### Urban-Area Segmentation Using Visual Words

Publication Year: 2009, Page(s):388 - 392
Cited by:  Papers (27)
| | PDF (602 KB) | HTML

In this letter, we address the problem of urban-area extraction by using a feature-free image representation concept known as ldquoVisual Words.rdquo This method is based on building a ldquodictionaryrdquo of small patches, some of which appear mainly in urban areas. The proposed algorithm is based on a new pixel-level variant of visual words and is based on three parts: building a visual dictiona... View full abstract»

• ### Evaluation of Morphological Texture Features for Mangrove Forest Mapping and Species Discrimination Using Multispectral IKONOS Imagery

Publication Year: 2009, Page(s):393 - 397
Cited by:  Papers (43)
| | PDF (1105 KB) | HTML

This letter aims to exploit morphological textures in discriminating three mangrove species and surrounding environment with multispectral IKONOS imagery in a study area on the Caribbean coast of Panama. Morphological texture features are utilized to distinguish red (Rhizophora mangle), white (Laguncularia racemosa), and black (Avicennia germinans) mangroves and rainforest regions. Meanwhile, two ... View full abstract»

• ### Optimizing $sigma^{0}$ Information From the Jason-2 Altimeter

Publication Year: 2009, Page(s):398 - 402
Cited by:  Papers (17)
| | PDF (670 KB) | HTML

A radar altimeter's normalized backscatter, sigma0, is used in many oceanographic applications to infer values of wind speed, wind stress, rain rate, and the presence of biogenic slicks. The waveform retracker used to estimate the key geophysical variables for the altimeters on the Jason-1 and Jason-2 satellites shows increased small-scale variability since the problem is ill-conditione... View full abstract»

• ### Comparison of SAR-Based Snow-Covered Area Estimation Methods for the Boreal Forest Zone

Publication Year: 2009, Page(s):403 - 407
Cited by:  Papers (3)
| | PDF (491 KB) | HTML

Spaceborne synthetic aperture radar data have been utilized for regional-scale snow-covered area (SCA) monitoring for several years. Different methods have been developed and demonstrated for different geographical regions. A method utilizing a single reference image for SCA estimation has been shown to function well on mountainous and nonforested regions. For the boreal forest zone, a method usin... View full abstract»

• ### Polarimetric Dual-Baseline InSAR Building Height Estimation at L-Band

Publication Year: 2009, Page(s):408 - 412
Cited by:  Papers (14)
| | PDF (349 KB) | HTML

This letter generalizes a multibaseline interferometric synthetic aperture radar (InSAR) signal model to the polarimetric scenario. Based on this formulation, two high-performance spectral analysis techniques are adapted to process multibaseline Pol-InSAR observations. These new methods enhance the height estimation of scatterers by calculating optimal polarization combinations and allow the deter... View full abstract»

• ### Coastal Validation of Ultra-high Resolution Wind Vector Retrieval From QuikSCAT in the Gulf of Maine

Publication Year: 2009, Page(s):413 - 417
Cited by:  Papers (10)
| | PDF (1296 KB) | HTML

An experimental 2.5-km ultrahigh-resolution (UHR) wind product provided by NASA's QuikSCAT scatterometer offers the potential for new access to coastal surface wind dynamics at the mesoscale level and below. To give future users the best indication of the value of these data, the UHR wind retrievals must be fully validated in nearshore areas. Comparison with meteorological buoys and standard QuikS... View full abstract»

• ### Windowed Fourier Transform for Noise Reduction of SAR Interferograms

Publication Year: 2009, Page(s):418 - 422
Cited by:  Papers (6)
| | PDF (429 KB) | HTML

In this letter, since these methods are able to process signals locally, two spatial frequency analyses including windowed Fourier transform and wavelet transform are used to reduce synthetic aperture radar interferometric phase noise. View full abstract»

• ### Narrow-Band Interference Suppression for SAR Based on Complex Empirical Mode Decomposition

Publication Year: 2009, Page(s):423 - 427
Cited by:  Papers (29)
| | PDF (483 KB) | HTML

Narrow-band interference (NBI) is a common interference source in synthetic aperture radar (SAR) imaging. Its existence will degrade the imaging quality greatly. Based on detailed analysis on the characteristics of NBI, this letter proposes a new NBI suppression algorithm using the complex empirical mode decomposition (CEMD) method. In this algorithm, echoes that include NBI are recognized in the ... View full abstract»

• ### Statistical Distribution of Visibilities in Digital Aperture Synthesis Radiometry

Publication Year: 2009, Page(s):428 - 432
| | PDF (167 KB) | HTML

The statistical characteristics of visibilities measured by digital complex correlators in aperture synthesis radiometry are investigated. First, the analytic probability density function of visibilities is derived under the assumption that the successive samples are Gaussian distributed and statistically independent. However, in practice, the assumption may be not satisfied due to non-Nyquist sam... View full abstract»

• ### Approximations of the Planck Function for Models and Measurements Into the Submillimeter Range

Publication Year: 2009, Page(s):433 - 437
Cited by:  Papers (3)
| | PDF (178 KB) | HTML

A brightness temperature is defined as a linear function of the Planck radiance, with the linear coefficients optimized to minimize the difference between the brightness temperature and the physical temperatures of atmospheric and terrestrial emitters. Radiative transfer (RT) calculations can be accelerated by formulating the integration in terms of this brightness temperature while producing outp... View full abstract»

• ### Space-Based Motion Estimators—Evaluation With the First RADARSAT-2 MODEX Data

Publication Year: 2009, Page(s):438 - 442
Cited by:  Papers (9)
| | PDF (630 KB) | HTML

Synthetic aperture radar (SAR)-based motion estimation algorithms, which have been developed and validated for airborne SAR data, are now being extended to the RADARSAT-2 Moving Object Detection Experiment (MODEX). Several modifications of the classical along-track interferometry (ATI) approach are considered. Some of the first MODEX results are presented, demonstrating the estimation of target po... View full abstract»

• ### Antenna Mask Design for SAR Performance Optimization

Publication Year: 2009, Page(s):443 - 447
Cited by:  Papers (10)
| | PDF (600 KB) | HTML

In this letter, an effective technique for synthetic aperture radar (SAR) antenna mask design is presented for optimizing the system performance of an active phased array SAR. The SAR antenna radiation pattern has an important effect on the system performance. Therefore, the authors derived the quantitative equations for the SAR antenna mainlobe and sidelobe mask design on the basis of the system ... View full abstract»

• ### Modeling the Error Statistics in Support Vector Regression of Surface Temperature From Infrared Data

Publication Year: 2009, Page(s):448 - 452
Cited by:  Papers (14)
| | PDF (223 KB) | HTML

Land and sea surface temperatures are important input parameters for many hydrological and meteorological models. Satellite infrared remote sensing is an effective tool for mapping these variables on regional and global scales. A supervised approach, based on support vector machines (SVMs), has recently been developed to estimate surface temperature from satellite radiometry. However, in order to ... View full abstract»

• ### Performance of Kriging-Based Soft Classification on WiFS/IRS-1D Image Using Ground Hyperspectral Signatures

Publication Year: 2009, Page(s):453 - 457
Cited by:  Papers (9)
| | PDF (318 KB) | HTML

Hard/soft classification techniques are the conventional ways of image classification on satellite data. These classifiers have a number of drawbacks. First, these approaches are inappropriate for mixed pixels. Second, these approaches do not consider spatial variability. Kriging-based soft classification (KBSC) is a nonparametric geostatistical method. It exploits the spatial variability of the c... View full abstract»

• ### A New Coherency Formalism for Change Detection and Phenomenology in SAR Imagery: A Field Approach

Publication Year: 2009, Page(s):458 - 462
Cited by:  Papers (15)
| | PDF (558 KB) | HTML

Optimal utilization of complex synthetic aperture radar imagery for coherent change detection (CCD) is achieved by maximizing the amount of information extracted from the coherent correlation of images. Conventional techniques cannot fully exploit the coherent information due to limited application of few products or indicators, e.g., correlation factor and phase maps. Also, considering the lack o... View full abstract»

• ### Integrating LiDAR Intensity and Elevation Data for Terrain Characterization in a Forested Area

Publication Year: 2009, Page(s):463 - 466
Cited by:  Papers (27)
| | PDF (376 KB) | HTML

Separating ground from nonground laser returns from airborne light detection and ranging (LiDAR) data is a key step in creating digital terrain models (DTMs). In this letter, bare-earth and forested surfaces are classified from LiDAR intensity data in a data set from central Idaho, U.S. Next, a Gaussian fitting (GF) method is applied to determine ground elevations from LiDAR elevation data accordi... View full abstract»

• ### A Closed-Form Expression Relating Classification Accuracy to SAR System Calibration Uncertainty

Publication Year: 2009, Page(s):467 - 470
Cited by:  Papers (5)
| | PDF (183 KB) | HTML

The choice of synthetic aperture radar (SAR) system design parameters such as radiometric calibration uncertainty and noise-equivalent sigma zero has a significant impact on applications exploiting SAR image data. However, methods for quantitatively translating the impact of system and mission parameter choices into the application context are lacking. This letter addresses this subject and derive... View full abstract»

## Aims & Scope

 IEEE Geoscience and Remote Sensing Letters (GRSL) is a monthly publication for short papers (maximum length 5 pages) addressing new ideas and formative concepts in remote sensing as well as important new and timely results and concepts.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Alejandro C. Frery