RADARSAT Antarctic Mapping Project-mosaic construction

Noltimier, K.F.; Jezek, Kenneth C.; Sohn, Hong-Gyoo; Li, B.; Liu, H.; Baumgärtner, F.; Kaupp, V. H.; Curlander, John C.; Wilson, Barbara A.; Onstott, R.G.

doi:10.1109/igarss.1999.771506

Cited by 10 publications

(12 citation statements)

References 2 publications

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“…Apart from this, many studies focus on the aspect on how to register different InSAR DEMs to each other. For example, the RADARSAT-1 Antarctic Mapping Project (RAMP), performed with data collected on September and October 1997, mainly focuses on the geometric aspects of the block adjustment [4], [5]. Only few studies consider possible approaches about the handling of multiple acquisitions.…”

mentioning

confidence: 99%

The TanDEM-X DEM Mosaicking: Fusion of Multiple Acquisitions Using InSAR Quality Parameters

Gruber

Wessel

Martone

et al. 2016

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Since 2010, TanDEM-X and its twin satellite TerraSAR-X fly in a close orbit formation and form a single-pass synthetic aperture radar (SAR) interferometer. The formation was established to acquire a global high-precision digital elevation model (DEM) using SAR interferometry (InSAR). In order to achieve the required height accuracy of the TanDEM-X DEM, at least two global coverages have to be acquired. However, in difficult and mountainous terrain, up to five coverages are present. Here, acquisitions from ascending and descending orbits are needed to fill gaps and to overcome geometric limitations. Therefore, a strategy to properly combine the available height estimates is mandatory. The objective of this paper is the presentation of the operational TanDEM-X DEM mosaicking approach. In general, multiple InSAR DEM heights are combined by means of a weighted average with the height error as weight. Apart from this widely used mosaicking approach, one big challenge remains with the handling of larger height discrepancies between the input data, which are mainly caused by phase unwrapping errors, but also by temporal changes between acquisitions. In the case of inconsistencies, the TanDEM-X mosaicking approach performs a grouping into height levels. A priority concept is set up to evaluate the different groups of heights considering the number of DEMs and several InSAR quality parameters: the height error, the phase unwrapping method, and the height of ambiguity. This allows the identification of the most reliable height level for mosaicking. This fusion concept is verified on different test areas affected by phase unwrapping errors in flat and mountainous terrain as well as by height discrepancies in forests. The results show that the quality of the final TanDEM-X DEM mosaic benefits a lot from this mosaicking approach.Index Terms-Digital elevation models (DEMs), image fusion, interferometric synthetic aperture radar (InSAR), mosaicking, TanDEM-X.

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confidence: 99%

The TanDEM-X DEM Mosaicking: Fusion of Multiple Acquisitions Using InSAR Quality Parameters

Gruber

Wessel

Martone

et al. 2016

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…The RADARSAT image mosaic of Antarctica was selected as the most accurate base available for geolocating the Landsat imagery; therefore, it was considered essential to confirm the published geodetic accuracy of the mosaic (±150 m; Noltimier and others, 1999).…”

Section: Methodsmentioning

confidence: 99%

Coastal-change and glaciological map of the Saunders Coast area, Antarctica: 1972–97

Ferrigno¹,

Williams²,

Foley³

2004

Ann. Glaciol.

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“…Geodetic ground-control points (GCPs) supplied by the National Imagery and Mapping Agency (NIMA) and the Environmental Research Institute of Michigan (ERIM) were used in conjunction with a calibration transponder located at the South Pole in the processing of data to improve the accuracy of geolocation from what is possible from use of satellite ephemeris data alone (Jezek, 1998, p. 15). Most of the 231 GCPs chosen (clustered at 91 locations) were located on nunataks in coastal regions; others were distributed along the Transantarctic Mountains The geodetic accuracy of the RADAR-SAT mosaic is cited as ± 150 m (Noltimier and others, 1999). Orthorectification of the mosaic was done using a Digital Elevation Model (OEM) generated by the BPRC specifically for the production of the mosaic.…”

Section: Methodsmentioning

confidence: 99%

Coastal-change and glaciological map of the Bakutis Coast, Antarctica: 1972-2002

Swithinbank¹,

Williams²,

Ferrigno³

et al. 2003

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RADARSAT Antarctic Mapping Project-mosaic construction

Cited by 10 publications

References 2 publications

The TanDEM-X DEM Mosaicking: Fusion of Multiple Acquisitions Using InSAR Quality Parameters

The TanDEM-X DEM Mosaicking: Fusion of Multiple Acquisitions Using InSAR Quality Parameters

Coastal-change and glaciological map of the Saunders Coast area, Antarctica: 1972–97

Coastal-change and glaciological map of the Bakutis Coast, Antarctica: 1972-2002

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