Henning Skriver
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View article: Omnibus Change Detection in Block Diagonal Covariance Matrix PolSAR Data Illustrated With Simulated and Sentinel-1 Data
Omnibus Change Detection in Block Diagonal Covariance Matrix PolSAR Data Illustrated With Simulated and Sentinel-1 Data Open
This article describes the latest developments in our work on complex Wishart distribution-based detection of change in time series of multilook polarimetric synthetic aperture radar data in the covariance matrix representation. These deve…
View article: Corrections to “Test Statistics for Reflection Symmetry: Applications to Quad-Polarimetric SAR Data for Detection of Man-Made Structures”
Corrections to “Test Statistics for Reflection Symmetry: Applications to Quad-Polarimetric SAR Data for Detection of Man-Made Structures” Open
In polarimetric synthetic aperture radar (SAR) images, speckle is removed by multilooking and the local covariance matrix is the main parameter of interest. In the covariance matrix from a backscatter with reflection symmetry, the terms , …
View article: Polarimetric SAR Features for Vehicle Detection in Natural Surroundings
Polarimetric SAR Features for Vehicle Detection in Natural Surroundings Open
The increased amount of information measured by fully polarimetric synthetic aperture radar (SAR) give additional knowledge about ground scatterers. Making the best use of the polarimetric information is crucial for target detection, among…
View article: Test Statistics for Reflection Symmetry: Applications to Quad-Polarimetric SAR Data for Detection of Man-Made Structures
Test Statistics for Reflection Symmetry: Applications to Quad-Polarimetric SAR Data for Detection of Man-Made Structures Open
In polarimetric synthetic aperture radar (SAR) images, speckle is removed by multilooking and the local covariance matrix is the main parameter of interest. In the covariance matrix from a backscatter with reflection symmetry, the terms , …
View article: Fusion of satellite SAR and passive microwave radiometer data for automated sea ice mapping and the expected impact of CIMR observations
Fusion of satellite SAR and passive microwave radiometer data for automated sea ice mapping and the expected impact of CIMR observations Open
Manual ice charting from multi-sensor satellite data analysis has for many years been the primary method at the National Ice Services for producing sea ice information for marine safety. Ice analysts primarily use satellite synthetic apert…
View article: Wishart-Based Adaptive Temporal Filtering of Polarimetric SAR Imagery
Wishart-Based Adaptive Temporal Filtering of Polarimetric SAR Imagery Open
Temporal filtering for speckle reduction of polarimetric SARimages is described. The method is based on a sequential complex Wishart-based change detection algorithm which is applied to polarized SAR imagery, including the dual-polarizatio…
View article: A Convolutional Neural Network Architecture for Sentinel-1 and AMSR2 Data Fusion
A Convolutional Neural Network Architecture for Sentinel-1 and AMSR2 Data Fusion Open
With a growing number of different satellite sensors, data fusion offers great potential in many applications. In this work, a Convolutional Neural Network (CNN) architecture is presented for fusing Sentinel-1 SAR imagery and the Advanced …
View article: Estimation of soil moisture from Sentinel data
Estimation of soil moisture from Sentinel data Open
<p>The present project presents the technical implementation, testing and validation of a soil moisture retrieval algorithm in Python using C-band Sentinel-1 data at high incidence angle (&#8764;42&#176;). The retrieval algor…
View article: Statistical Analysis of Changes in Sentinel-1 Time Series on the Google Earth Engine
Statistical Analysis of Changes in Sentinel-1 Time Series on the Google Earth Engine Open
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 sequential complex Wishart-based algorithm which is applicable to the dual polari…
View article: Interpolation of AMSR2 data for improvement of ice charting
Interpolation of AMSR2 data for improvement of ice charting Open
Today, ice charts in Greenland waters are produced manually by the Danish Meteorological Institute (DMI) for selected regions depending on season and shipping routes. The project “Automated Downstream Sea Ice Products for Greenland Waters”…
View article: Automatic satellite-based ice charting using AI
Automatic satellite-based ice charting using AI Open
Synthetic Aperture Radar (SAR) satellite images are used extensively for producing sea ice charts in support for Arctic navigation. However, due to ambiguities in the relationship between Cband SAR backscatter and ice conditions (differen…
View article: Simulated Sar Data Of Vehicles On A Background
Simulated Sar Data Of Vehicles On A Background Open
The simulated data set is used as input to a convolutional neural network to train the classifier.
View article: Change detection in a time series of polarimetric SAR data by an omnibus test statistic and its factorization (Conference Presentation)
Change detection in a time series of polarimetric SAR data by an omnibus test statistic and its factorization (Conference Presentation) Open
Based on an omnibus likelihood ratio test statistic for the equality of several variance-covariance matrices following the complex Wishart distribution with an associated p-value and a factorization of this test statistic, change analysis …
View article: Short-Term Change Detection in Wetlands Using Sentinel-1 Time Series
Short-Term Change Detection in Wetlands Using Sentinel-1 Time Series Open
Automated monitoring systems that can capture wetlands’ high spatial and temporal variability are essential for their management. SAR-based change detection approaches offer a great opportunity to enhance our understanding of complex and d…
View article: Change detection in a short time sequence of polarimetric C-band SAR data
Change detection in a short time sequence of polarimetric C-band SAR data Open
Based on an omnibus likelihood ratio test statistic for the equality of several variance-covariance matrices following the complex Wishart distribution and a factorization of this test statistic with associated p-values, change analysis in…
View article: An omnibus likelihood test statistic and its factorization for change detection in time series of polarimetric SAR data
An omnibus likelihood test statistic and its factorization for change detection in time series of polarimetric SAR data Open
The Sentinel Alpine Observatory is a new initiative by EURAC to foster Sentinel based remote sensing applications for mountains and, specifically, for the European Alps. It comprises a long-term archive for Sentinel data over the Alps, pro…
View article: Identification of Dynamic Cover Types in Wetlands by using Multitemporal Cross-polarized Sentinel-1 Images
Identification of Dynamic Cover Types in Wetlands by using Multitemporal Cross-polarized Sentinel-1 Images Open
Monitoring of long-term land-use and land-cover change patterns may be biased by seasonal changes of different surface properties (e.g. hydrology, phenology, etc.) which become even more prominent in highly dynamic ecosystems such as wetla…
View article: Change detection in quad and dual pol, single- and bi-frequency SAR data
Change detection in quad and dual pol, single- and bi-frequency SAR data Open
When the covariance matrix representation is used for multi-look polarimetric synthetic aperture radar (SAR) data, the complex Wishart distribution applies. Based on this distribution a likelihood ratio test statistic for equality of two c…
View article: Change detection in polarimetric SAR images using complex Wishart distributed matrices
Change detection in polarimetric SAR images using complex Wishart distributed matrices Open
In surveillance it is important to be able to detect natural or man-made changes e.g. based on sequences of satellite or air borne images of the same area taken at different times. The mapping capability of synthetic aperture radar (SAR) i…