Horst Hammer
YOU?
Author Swipe
View article: Minimal rotations in arbitrary dimensions with applications to hypothesis testing and parameter estimation
Minimal rotations in arbitrary dimensions with applications to hypothesis testing and parameter estimation Open
The rotation of a vector around the origin and in a plane constitutes a minimal rotation. Such a rotation is of vital importance in many applications. Examples are the re-orientation of spacecraft or antennas with minimal effort, the smoot…
View article: Your Input Matters—Comparing Real-Valued PolSAR Data Representations for CNN-Based Segmentation
Your Input Matters—Comparing Real-Valued PolSAR Data Representations for CNN-Based Segmentation Open
Inspired by the success of Convolutional Neural Network (CNN)-based deep learning methods for optical image segmentation, there is a growing interest in applying these methods to Polarimetric Synthetic Aperture Radar (PolSAR) data. However…
View article: PSDefoPAT—Persistent Scatterer Deformation Pattern Analysis Tool
PSDefoPAT—Persistent Scatterer Deformation Pattern Analysis Tool Open
Persistent Scatterer Deformation Pattern Analysis Tool, for short PSDefoPAT, was designed to assign each measuring point of an advanced DInSAR data set a best-fitting time series model based on its displacement time series. In this paper, …
View article: Towards a reliable detection of debris in high resolution SAR images of urban areas
Towards a reliable detection of debris in high resolution SAR images of urban areas Open
For texture based damaged detection in SAR imagery, heaps of debris surrounding damaged buildings pose the most promising signatures. However, the textural similarity to the signature of high vegetation proves to be a problem. The focus of…
View article: PSDEFOPAT – TOWARDS AUTOMATIC MODEL BASED PSI POST-PROCESSING
PSDEFOPAT – TOWARDS AUTOMATIC MODEL BASED PSI POST-PROCESSING Open
The deformation of the surface of the earth is triggered by numerous naturally occurring and artificial processes such as global isostatic adjustment, aseismic and coseismic movement, varying amounts of groundwater or gas stored undergroun…
View article: MULTI-FREQUENCY POLINSAR DATA ARE ADVANTAGEOUS FOR LAND COVER CLASSIFICATION – A VISUAL AND QUANTITATIVE ANALYSIS
MULTI-FREQUENCY POLINSAR DATA ARE ADVANTAGEOUS FOR LAND COVER CLASSIFICATION – A VISUAL AND QUANTITATIVE ANALYSIS Open
This paper investigates the enhanced potential of using multi-frequency PolInSAR data for land cover classification. In order to enable a descriptive analysis that goes beyond the mere comparison of classification accuracies, a two-step cl…
View article: Enhancing Coherence Images for Coherent Change Detection: An Example on Vehicle Tracks in Airborne SAR Images
Enhancing Coherence Images for Coherent Change Detection: An Example on Vehicle Tracks in Airborne SAR Images Open
In Synthetic Aperture Radar (SAR) interferometry, one of the most widely used measures for the quality of the interferometric phase is coherence. However, in favorable conditions coherence can also be used to detect subtle changes on the g…
View article: ON THE CLASSIFIER PERFORMANCE FOR SIMULATION BASED DEBRIS DETECTION IN SAR IMAGERY
ON THE CLASSIFIER PERFORMANCE FOR SIMULATION BASED DEBRIS DETECTION IN SAR IMAGERY Open
Urban areas struck by disasters such as earthquakes are in need of a fast damage detection assessment. A post-event SAR image often is the first available image, most likely with no matching pre-event image to perform change detection. In …
View article: CONCEPT TO ANALYZE THE DISPLACEMENT TIME SERIES OF INDIVIDUAL PERSISTENT SCATTERERS
CONCEPT TO ANALYZE THE DISPLACEMENT TIME SERIES OF INDIVIDUAL PERSISTENT SCATTERERS Open
Persistent Scatterer Interferometry (PSInSAR) exploits a time series of Synthetic Aperture Radar (SAR) images to estimate the mean velocity with which the surface of the earth is deforming. However, most PSInSAR algorithms estimate the mea…
View article: EVALUATING UNIFORM MANIFOLD APPROXIMATION AND PROJECTION FOR DIMENSION REDUCTION AND VISUALIZATION OF POLINSAR FEATURES
EVALUATING UNIFORM MANIFOLD APPROXIMATION AND PROJECTION FOR DIMENSION REDUCTION AND VISUALIZATION OF POLINSAR FEATURES Open
In this paper, the nonlinear dimension reduction algorithm Uniform Manifold Approximation and Projection (UMAP) is investigated to visualize information contained in high dimensional feature representations of Polarimetric Interferometric …
View article: STRATEGIES FOR PS PROCESSING OF LARGE SENTINEL-1 DATASETS
STRATEGIES FOR PS PROCESSING OF LARGE SENTINEL-1 DATASETS Open
Several advanced DInSAR techniques have been used to map surface deformations due to volcanism, active tectonics, landslides, subsidence, and uplift as well as to monitor the deformation of critical infrastructure such as bridges and dams.…
View article: DELINEATION AND CONSTRUCTION OF 2D GEOMETRIES BY FREEHAND DRAWING AND GEOMETRIC REASONING
DELINEATION AND CONSTRUCTION OF 2D GEOMETRIES BY FREEHAND DRAWING AND GEOMETRIC REASONING Open
The creation of accurate and consistent line drawings is the subject of various applications. Prominent examples are the delineation of human-made objects in aerial images and the construction of technical line drawings, flow-charts, or di…
View article: ASSESSING THE SUITABILITY OF SIMULATED SAR SIGNATURES OF DEBRIS FOR THE USAGE IN DAMAGE DETECTION
ASSESSING THE SUITABILITY OF SIMULATED SAR SIGNATURES OF DEBRIS FOR THE USAGE IN DAMAGE DETECTION Open
When disasters strike in urban areas, the most important issue is to direct rescue forces to the most heavily destroyed areas. SAR images, because of their independence from daylight and weather conditions, are the remote sensing tool of c…
View article: ENHANCEMENT OF GENERIC BUILDING MODELS BY RECOGNITION AND ENFORCEMENT OF GEOMETRIC CONSTRAINTS
ENHANCEMENT OF GENERIC BUILDING MODELS BY RECOGNITION AND ENFORCEMENT OF GEOMETRIC CONSTRAINTS Open
Many buildings in 3D city models can be represented by generic models, e.g. boundary representations or polyhedrons, without expressing building-specific knowledge explicitly. Without additional constraints, the bounding faces of these bui…
View article: Discriminating between the SAR signatures of debris and high vegetation
Discriminating between the SAR signatures of debris and high vegetation Open
The signature of heaps of debris surrounding damaged buildings pose the most promising signature for texture based damage detection in SAR imagery. However, the textural similarity to the signature of high vegetation turns out to be proble…