The Global Tandem-X Dem: Production Status and First Validation Results

Huber, Martin; Gruber, Astrid; Wendleder, Anna; Wessel, Birgit; Roth, Achim; Schmitt, Andreas

doi:10.5194/isprsarchives-xxxix-b7-45-2012

Cited by 19 publications

(13 citation statements)

References 8 publications

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“…Digital elevation data sets were used to reduce displacement caused by terrain relief. These included the Yukon Digital Elevation Model (30.0-m ground resolution; Environment Yukon, 2016), airborne LiDAR (light detection and ranging) elevation data (1.0-m ground resolution and vertical accuracy of 0.15 ± 0.1 m) (Kohnert et al, 2014;Obu et al, 2016Obu et al, , 2017, and the TanDEM-X intermediate digital elevation model (12.0-m ground resolution; Huber et al, 2012). Each image was orthorectified to the average height of the digitized shoreline position.…”

Section: Geo-codingmentioning

confidence: 99%

Variability in Rates of Coastal Change Along the Yukon Coast, 1951 to 2015

et al. 2018

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To better understand the reaction of Arctic coasts to increasing environmental pressure, coastal changes along a 210‐km length of the Yukon Territory coast in north‐west Canada were investigated. Shoreline positions were acquired from aerial and satellite images between 1951 and 2011. Shoreline change rates were calculated for multiple time periods along the entire coast and at six key sites. Additionally, Differential Global Positioning System (DGPS) measurements of shoreline positions from seven field sites were used to analyze coastal dynamics from 1991 to 2015 at higher spatial resolution. The whole coast has a consistent, spatially averaged mean rate of shoreline change of 0.7 ± 0.2 m/a with a general trend of decreasing erosion from west to east. Additional data from six key sites shows that the mean shoreline change rate decreased from −1.3 ± 0.8 (1950s–1970s) to −0.5 ± 0.6 m/a (1970s–1990s). This was followed by a significant increase in shoreline change to −1.3 ± 0.3 m/a in the 1990s to 2011. This increase is confirmed by DGPS measurements that indicate increased erosion rates at local rates up to −8.9 m/a since 2006. Ground surveys and observations with remote sensing data indicate that the current rate of shoreline retreat along some parts of the Yukon coast is higher than at any time before in the 64‐year‐long observation record. Enhanced availability of material in turn might favor the buildup of gravel features, which have been growing in extent throughout the last six decades.

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Section: Geo-codingmentioning

confidence: 99%

Variability in Rates of Coastal Change Along the Yukon Coast, 1951 to 2015

et al. 2018

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“…The data can freely be downloaded from the SRTM Website [590]. Note that the standard accuracy of airborne single-pass InSAR-DEM is the Currently, a global-scale DEM with the HRTI-3 standard is being made using TerraSAR-X and TanDEM-X [22,171,[593][594][595][596][597]. The data acquisition is by the strip (map) mode for the repeat-pass InSAR and bistatic mode for the tandem formation.…”

Section: Digital Elevation Model Generationmentioning

confidence: 99%

“…There is a trade-off between the interferometric coherence and the accuracy of height measurements. Although X-and C-band SARs are useful for DEM generation (and indeed is being in progress using TerraSAR-X and TanDEM-X [22,171,[593][594][595][596][597]), L-band SAR has an advantage for its high coherence over the surfaces covered by vegetation and insensitivity to the changes over long time periods, in particular, for the measurements of temporal surface height changes by DInSAR.…”

Section: Interferometric Coherencementioning

confidence: 99%

Recent Trend and Advance of Synthetic Aperture Radar with Selected Topics

2013

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The present article is an introductory paper in this special issue on synthetic aperture radar (SAR). A short review is presented on the recent trend and development of SAR and related techniques with selected topics, including the fields of applications, specifications of airborne and spaceborne SARs, and information contents in and interpretations of amplitude data, interferometric SAR (InSAR) data, and polarimetric SAR (PolSAR) data. The review is by no means extensive, and as such only brief summaries of of each selected topics and key references are provided. For further details, the readers are recommended to read the literature given in the references theirin.

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“…It is worth pointing out that the individual TanDEM‐X DEM scenes delivered by the Interferometric TanDEM‐X Processor are only roughly calibrated [ Fritz et al , ; Rossi et al , ], which explains the almost constant offset of about 3 m observed between the two DEMs. Such residual biases and offsets are subject to the final calibration and mosaicking, which is performed by a second independent processing system, the Mosaicking and Calibration Processor [ Gruber et al , ; Huber et al , ]. Then, a high‐pass filter is applied (in frequency domain) to the obtained DEM difference matrix in order to include only the noise‐like error contributions.…”

Section: Relative Height Error Analysismentioning

confidence: 99%

First 2 years of TanDEM‐X mission: Interferometric performance overview

et al. 2013

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[1] The TerraSAR-X add-on for Digital Elevation Measurement (TanDEM-X) mission comprises two nearly identical satellites: TerraSAR-X (TSX, launched in June 2007), and TanDEM-X (TDX, launched in June 2010), which form an innovative and flexible single-pass radar interferometer. The primary objective of the mission is to generate a worldwide and consistent digital elevation model (DEM) with an unprecedented accuracy. After a calibration phase of the TDX satellite, which was performed during the first 3 months after its launch, the two satellites were brought into close formation to begin the bistatic commissioning phase. Then, in December 2010, TanDEM-X started the operational global DEM acquisition in bistatic configuration. During the last 2 years, dedicated analyses on test acquisitions as well as persistent monitoring of the interferometric performance have been carried out, which are the subject of this paper. Key quantities in estimating interferometric performance such as coherence, relative height error, and phase-unwrapping indicators are investigated, showing the outstanding capabilities of TanDEM-X. Then, the main focus is shifted to those critical areas which, for various reasons, have shown unsatisfactory data quality and therefore must be reacquired with optimized imaging geometries in order to fulfill the DEM accuracy requirements. Promising results have been obtained so far, and future strategies to handle the critical data are discussed. This paper will present an overview of the interferometric performance of TanDEM-X, based on investigations performed in the first 2 years of mission operation, and will include results from the bistatic commissioning phase until the end of the first global DEM acquisition.

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The Global Tandem-X Dem: Production Status and First Validation Results

Cited by 19 publications

References 8 publications

Variability in Rates of Coastal Change Along the Yukon Coast, 1951 to 2015

Variability in Rates of Coastal Change Along the Yukon Coast, 1951 to 2015

Recent Trend and Advance of Synthetic Aperture Radar with Selected Topics

First 2 years of TanDEM‐X mission: Interferometric performance overview

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