A5038152163- Synthetic Aperture Radar (SAR) Applications and Techniques
- Cryospheric studies and observations
- Soil Moisture and Remote Sensing
- Landslides and related hazards
- Geophysics and Gravity Measurements
- Remote Sensing and LiDAR Applications
- Advanced SAR Imaging Techniques
- Climate change and permafrost
- Remote-Sensing Image Classification
- Arctic and Antarctic ice dynamics
- Satellite Image Processing and Photogrammetry
- Automated Road and Building Extraction
- Winter Sports Injuries and Performance
- Polar Research and Ecology
- Wireless Body Area Networks
- Methane Hydrates and Related Phenomena
- Planetary Science and Exploration
- Advanced Image Fusion Techniques
- Geology and Paleoclimatology Research
- Flood Risk Assessment and Management
- Wireless Power Transfer Systems
- Image and Signal Denoising Methods
- GNSS positioning and interference
- Energy Harvesting in Wireless Networks
- Optical measurement and interference techniques
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2016-2025
ORCID
2021
Massachusetts Institute of Technology
2006
MIT Lincoln Laboratory
2006
University of Pittsburgh
2004-2005
Neurological Surgery
2005
Remote Sensing Solutions (Germany)
2004
Technical University of Munich
2002
The primary objective of the TanDEM-X mission is generation a global, consistent, and high-resolution digital elevation model (DEM) with unprecedented global accuracy. goal achieved by exploiting interferometric capabilities two twin SAR satellites TerraSAR-X TanDEM-X, which fly in close orbit formation, acting as an X-band single-pass interferometer. Between December 2010 early 2015 all land surfaces have been acquired at least twice, difficult terrain up to seven or eight times....
The primary goal of the German TanDEM-X mission is generation a highly accurate and global Digital Elevation Model (DEM) with accuracies at least 10 m absolute height error (linear 90% error). DEM acquired single-pass SAR interferometry was finished in September 2016. This paper provides unique accuracy assessment final using two different GPS point reference data sets, which are distributed across all continents, to fully characterize error. Firstly, vertical examined by about three million...
TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurements) is an innovative formation flying radar mission that opens a new era in spaceborne remote sensing. The primary objective the acquisition of global Model (DEM) with unprecedented accuracy (12 m horizontal resolution and 2 relative height accuracy). This goal achieved by extending TerraSAR-X synthetic aperture (SAR) second, like satellite (TDX) close (TSX). resulting large single-pass SAR interferometer features flexible baseline...
On June 21, 2010, the TanDEM-X mission was launched and opened a new era in spaceborne radar remote sensing. The first formation flying system built by extending TerraSAR-X synthetic aperture (SAR) second, TerraSAR-X-like satellite TanDEM-X. resulting large single-pass SAR interferometer features flexible baseline selection, enabling acquisition of highly accurate cross-track interferograms not impacted temporal decorrelation atmospheric disturbances. primary objective generation global...
The German SAR interferometry mission TanDEM-X performed on two TerraSAR-X satellites flying in close formation will provide a global Digital Elevation Model (DEM). A by-product is so-called the Water Indication Mask (WAM). purpose of this supplementary information layer to support DEM editing process. surfaces usually show lower coherence an interferometric data set due temporal de-correlation and low backscattering. Consequently corresponding elevation values derived from interferogram are...
Since 2010, TanDEM-X and its twin satellite TerraSAR-X fly in a close orbit formation form single-pass synthetic aperture radar (SAR) interferometer. The was established to acquire global high-precision digital elevation model (DEM) using SAR interferometry (InSAR). In order achieve the required height accuracy of DEM, at least two coverages have be acquired. However, difficult mountainous terrain, up five are present. Here, acquisitions from ascending descending orbits needed fill gaps...
Accelerating melt on the Greenland ice sheet leads to dramatic changes at a global scale. Especially in last decades, not only monitoring, but also quantification of these has gained considerably importance. In this context, Interferometric Synthetic Aperture Radar (InSAR) systems complement existing data sources by their capability acquire 3D information high spatial resolution over large areas independent weather conditions and illumination. However, penetration SAR signals into snow...
The TanDEM-X mission will derive a global digital elevation model (DEM) with satellite SAR interferometry. Height references play an important role to ensure the required height accuracy of 10 m absolute and 2 relative for 90% data. In this paper main reference data sets ICESat (for DEM calibration), SRTM phase unwrapping) kinematic GPS-Tracks (KGPS - verification) are analyzed regarding their accuracy. For reliable quality measure is developed. improved version adjusted presented concept...
Abstract. We present the generation and validation of an updated version TanDEM-X digital elevation model (DEM) Antarctica: PolarDEM 90 m Antarctica. Improvements compared to global DEM comprise filling gaps with newer bistatic synthetic aperture radar (SAR) acquisitions TerraSAR-X satellites, interpolation smaller voids, smoothing noisy areas, replacement frozen or open sea areas geoid undulations. For latter, a new semi-automatic editing approach allowed for delineation coastline from...
In this paper we present for the first time new digital elevation model (DEM) Greenland produced by TanDEM-X (TerraSAR add-on measurement) mission. The new, full coverage DEM of has a resolution 0.4 arc seconds corresponding to 12 m. It is composed more than 7.000 interferometric synthetic aperture radar (InSAR) scenes. X-Band SAR penetrates snow and ice pack several meters depending on structures within snow, acquisition parameters, dielectricity constant medium. Hence, resulting...
Abstract. Subglacial lakes form beneath ice sheets and caps if water is available bedrock surface topography are able to retain the water. On a regional scale, modulate timing rate of freshwater flow through subglacial system ocean by acting as reservoirs. More than 100 hydrologically active that drain recharge periodically have been documented under Antarctic Ice Sheet, while only approximately 20 identified in Greenland. Active may be local changes caused drainage or lake ice. The small...
The global digital elevation model (DEM) produced by the TanDEM-X (TerraSAR-X add-on for measurements) mission is an interferometric with unprecedented quality, accuracy, and coverage. It represents unedited surface as artifacts inherent to synthetic aperture radar acquisition processing technique are still present. most prominent in DEM water bodies appearing a rough due low coherence. Additionally, outliers, voids, larger data gaps may be present this dataset. Therefore, editing crucial...
Three synthetic aperture radar (SAR) data classification methodologies were used to assess the ability of single-polarization and dual-polarization TerraSAR-X (TSX) classify surface water, including open ice, flooded vegetation. Multi-polarization SAR observations contain more information than SAR, but availability multi-polarization is much lower, which limits temporal monitoring capabilities. The study area a principally natural landscape centered on seasonally flooding river, in four TSX...
The aimed accuracies for the final TanDEM-X DEM of 10m absolute and 2m relative height error will be ensured by calibration data. One crucial data set accuracy is tie-points that connect adjacent acquisitions in approximately 4km-overlap-area with each other. In this paper an improved concept tie-point candidates presented based on averaging a larger region instead comparing single points. This should more robust against noise. It validated applying simulated test area, as real was not yet...
This paper presents a novel approach for automated image comparison and robust change detection from noisy imagery, such as synthetic aperture radar (SAR) amplitude images. Instead of comparing pixel values and/or pre-classified features this clearly highlights structural changes without any preceding segmentation or classification step. The crucial point is the use Curvelet transform in order to express composition several structures instead numerous individual pixels. Differentiating these...
The digital elevation model (DEM) of the Shuttle Radar Topography Mission (SRTM) still has known long-wave height errors. These errors occur especially in continent's interior with a spatial scale hundreds to thousands kilometers and magnitude several meters. In this letter, for first time, method estimating those intention improve absolute accuracy SRTM C-band DEM globally is presented. improvement bases on continuously defined spherical harmonics which are able whole sphere. highly...
Ongoing global warming causes dramatic changes globally, especially with respect to Polar Regions. In this context, digital elevation data is of high importance for most glaciological applications. paper, we investigate TanDEM-X penetration depth over snow and ice on the Greenland sheet. particular, relation backscatter intensity interferometric coherence X-band InSAR signal explored in order improve reliability data. The analyses showed a distinct relationship intensity, depth. addition,...