Search Results - "Nielsen, Allan A."

Wishart-Based Adaptive Temporal Filtering of Polarimetric SAR Imagery by Canty, Morton J., Nielsen, Allan A., Skriver, Henning, Conradsen, Knut

“…Temporal filtering for speckle reduction of polarimetric SARimages is described. The method is based on a sequential complex Wishart-based change detection…”
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The Loewner Order and Direction of Detected Change in Sentinel-1 and Radarsat-2 Data by Nielsen, Allan A., Skriver, Henning, Conradsen, Knut

“…When the covariance matrix formulation is used for multilook polarimetric synthetic aperture radar (SAR) data, the complex Wishart distribution can be used for…”
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Automatic radiometric normalization of multitemporal satellite imagery with the iteratively re-weighted MAD transformation by Canty, Morton J., Nielsen, Allan A.

“…A recently proposed method for automatic radiometric normalization of multi- and hyperspectral imagery based on the invariance property of the Multivariate…”
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Statistical Analysis of Changes in Sentinel-1 Time Series on the Google Earth Engine by Canty, Morton J., Nielsen, Allan A., Conradsen, Knut, Skriver, Henning

“…Time series analysis of Sentinel-1 SAR imagery made available by the Google Earth Engine (GEE) is described. Advantage is taken of a recent modification of a…”
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Corrections to "Change Detection in Full and Dual Polarization, Single- and Multi-Frequency SAR Data" [Aug 15 4041-4048] by Nielsen, Allan A., Conradsen, Knut, Skriver, Henning

“…When the covariance matrix formulation is used for multi-look polarimetric synthetic aperture radar (SAR) data, the complex Wishart distribution applies. Based…”
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Automatic radiometric normalization of multitemporal satellite imagery by Canty, Morton J, Nielsen, Allan A, Schmidt, Michael

“…The linear scale invariance of the multivariate alteration detection (MAD) transformation is used to obtain invariant pixels for automatic relative radiometric…”
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Visualization of and Software for Omnibus Test-Based Change Detected in a Time Series of Polarimetric SAR Data by Allan A. Nielsen, Knut Conradsen, Henning Skriver, Morton J. Canty

“…Based on an omnibus likelihood ratio test statistic for the equality of several variance-covariance matrices following the complex Wishart distribution and a…”
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Linear and kernel methods for multivariate change detection by Canty, Morton J., Nielsen, Allan A.

“…The iteratively reweighted multivariate alteration detection (IR-MAD) algorithm may be used both for unsupervised change detection in multi- and hyperspectral…”
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Automated Invariant Alignment to Improve Canonical Variates in Image Fusion of Satellite and Weather Radar Data by Vestergaard, Jacob S., Nielsen, Allan A.

“…Canonical correlation analysis (CCA) maximizes the correlation between two sets of multivariate data. CCA is applied to multivariate satellite data and…”
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Visualization and unsupervised classification of changes in multispectral satellite imagery by Canty, Morton J., Nielsen, Allan A.

“…The statistical techniques of multivariate alteration detection, minimum/maximum autocorrelation factors transformation, expectation maximization and…”
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Multivariate Alteration Detection (MAD) and MAF Postprocessing in Multispectral, Bitemporal Image Data: New Approaches to Change Detection Studies by Nielsen, Allan A., Conradsen, Knut, Simpson, James J.

“…This article introduces the multivariate alteration detection (MAD) transformation which is based on the established canonical correlations analysis. It also…”
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Rotation of Polarimetric SAR Covariance Matrices by Nielsen, Allan A.

“…In multilook polarimetric synthetic aperture radar (polSAR) data dihedral targets unaligned with the radar line of sight cause cross-polarized reflections…”
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Combination of Wishart Test Statistics and Loewner Order for Change Detection in Quad/Full and Dual Polarization Sar Data by Nielsen, Allan A., Skriver, Henning, Conradsen, Knut

“…We use the combined Wishart-Loewner method to successfully detect change and direction of change in truly multitemporal, multilooked quad/full polarization…”
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Change Detection in Single- and Multi-Look Polarimetric SAR Data by Nielsen, Allan A., Connetable, Paul J., Conradsen, Knut, Skriver, Henning, Krogager, Ernst

“…We describe the use of P-band data from DLR's F-SAR system to change detection between three time points. Change detection on data in the covariance matrix…”
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Change detection in bi-temporal data by canonical information analysis by Nielsen, Allan A., Vestergaard, Jacob S.

“…Canonical correlation analysis (CCA) is an established multivariate statistical method for finding similarities between linear combinations of (normally two)…”
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Canonical analysis basedonmutual information by Nielsen, Allan A., Vestergaard, Jacob S.

“…Canonical correlation analysis (CCA) is an established multi-variate statistical method for finding similarities between linear combinations of (normally two)…”
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Kernel parameter dependence in spatial factor analysis by Nielsen, Allan A

“…Principal component analysis (PCA) is often used for general feature generation and linear orthogonalization or compression by dimensionality reduction of…”
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Fast Matrix Based Computation of Eigenvalues in PolSAR Data by Nielsen, Allan A.

“…We describe calculation of eigenvalues of 2×2 and 3×3 Hermitian matrices as used in the analysis of multilook polarimetric SAR data. The eigenvalues are…”
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Automatic radiometric normalization of multitemporal satellite imagery by CANTY, Morton J, NIELSEN, Allan A, SCHMIDT, Michael

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Omnibus test for change detection in a time sequence of polarimetric SAR data by Nielsen, Allan A., Conradsen, Knut, Skriver, Henning

“…Based on an omnibus likelihood ratio test statistic for the equality of several variance-covariance matrices following the complex Wishart distribution with an…”
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