XXII ISPRS Congress 2012: Technical Commission VII

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Multivolume work

Persistent identifier:: 1663813779

Title:: XXII ISPRS Congress 2012

Sub title:: Melbourne, Australia, 25 August-1 September 2012

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663813779

Language:: English

Additional Notes:: Kongress-Thema: Imaging a sustainable future

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1663821976

Title:: Technical Commission VII

Scope:: 546 Seiten

Year of publication:: 2013

Place of publication:: Red Hook, NY

Publisher of the original:: Curran Associates, Inc.

Identifier (digital):: 1663821976

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(39,B7)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist ermittelt.; Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 22., 2012, Melbourne; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [VII/2: SAR INTERFEROMETRY]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: THE GLOBAL TANDEM-X DEM: PRODUCTION STATUS AND FIRST VALIDATION RESULTS M. Huber, A. Gruber, A. Wendleder, B. Wessel, A. Roth, A. Schmitt

Document type:: Multivolume work

Structure type:: Chapter

D., 2012. i-channel ng, IEEE . Glacier tracking. pp. 394— Gay, M., Jombrun, 1d Bolon, by multi- irements. ote Sens- ng: from , G. and by maxi- iE Trans. à K, $., cher, in- ; pp. 87- tochastic lorn, R., e aletsch y. Geo- 419—430. 1, E. and it alpiner rometrie. 130. mler, R., xploiting 1 of Pho- olarimet- logy 17, ; F. and n. Geo- p. 2861— aracteris- ournal of International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012 XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia THE GLOBAL TANDEM-X DEM: PRODUCTION STATUS AND FIRST VALIDATION RESULTS M. Huber* *, A. Gruber*, A. Wendleder “, B. Wessel ?, A. Roth *, A. Schmitt? * DLR, German Aerospace Center, 82234 Wessling Oberpfaffenhofen, Germany - (martin.huber, astrid.gruber, anna.wendleder, birgit.wessel, achim.roth, andreas.schmitt)@dir.de KEY WORDS: TanDEM-X, DEM, InSAR, Global, Calibration, Mosaic, Block Adjustment, Validation ABSTRACT: The TanDEM-X mission will derive a global digital elevation model (DEM) with satellite SAR interferometry. Two radar satellites (TerraSAR-X and TanDEM-X) will map the Earth in a resolution and accuracy with an absolute height error of 10m and a relative height error of 2m for 90% of the data. In order to fulfill the height requirements in general two global coverages are acquired and processed. Besides the final TanDEM-X DEM, an intermediate DEM with reduced accuracy is produced after the first coverage is completed. The last step in the whole workflow for generating the TanDEM-X DEM is the calibration of remaining systematic height errors and the merge of single acquisitions to 1°x1° DEM tiles. In this paper the current status of generating the intermediate DEM and first validation results based on GPS tracks, laser scanning DEMs, SRTM data and ICESat points are shown for different test sites. 1. INTRODUCTION The final product of the TanDEM-X mission (Krieger et al. 2007) will be a global digital elevation model (DEM) with an absolute height error of 10m and a relative height error of 2m for 90% of the data, respectively. For this purpose at least two global coverages will be acquired with SAR interferometry. Areas with undulated terrain will be also observed from ascending and descending orbits, where necessary. As a pre-version, the intermediate DEM (IDEM) will be produced for selected areas utilizing the first global coverage only. Even though the IDEM will not have the final TanDEM-X DEM accuracy, it provides a first impression on the prospective quality of this product. In Chapter 2 the Mosaicking and Calibration Processor which stands at the end of the whole workflow for generating the TanDEM-X DEM is outlined. Then in Chapter 3 the current production status and validation results for different test sites and different reference data are shown. Additional product layers like height error map, amplitude image, water indication mask, coverage map, layover and shadow mask, interpolation mask and void mask are presented in Chapter 4. 2. MOSAICKING AND CALIBRATION PROCESSOR Smaller systematic errors in the order of a few meters still remain in single acquisitions, although intensive instrument calibration and high precision orbit and baseline determination are conducted (Hueso et al. 2011). Based on these acquisitions, which can be hundreds of kilometers long, the Integrated TanDEM-X Processor (ITP) generates single interferometric DEMs (Fritz et al. 2008). This so-called RawDEMs, having a size of typically 30km by 50km, serve as input for the Mosaicking and Calibration Processor (MCP). The MCP consists of three components which are working independently from each other. * Corresponding author. 45 2.1 MCP Preparation The first MCP component, the DEM Preparation processor, is a data-driven process. A first analysis of the RawDEM is performed which comprises a height discrepancy detection to a reference DEM (e.g. SRTM), a water body detection (Wendleder et al. 2012) and the extraction of calibration points (Huber et al. 2009, Huber et al. 2010) as input for the DEM calibration processor. After interactive quality control the result is stored for later processing. 2.2 MCP Calibration The second component, the DEM Calibration Processor, is initiated by an operator. A processing request for a dedicated region is generated and sent to MCP. During the DEM Calibration a block adjustment procedure calculates offsets and tilts for each DEM acquisition (Gruber et al. 2009, Wessel et al. 2009). Therein, the elevation of tie-points in overlapping regions and ICESat points collected during MCP preparation are used to assure the relative and absolute height accuracy requirement. After quality control the correction parameters are stored within the annotation information for each RawDEM. 2.3 MCP Mosaicking The third processor, the DEM Mosaicking Processor, is also initiated by an operator. A request for a defined region is generated and sent to MCP. Then, the DEM layers and additional information layers of all RawDEMSs are mosaicked. After final quality control the mosaicked DEM is divided into DEM product tiles and archived.

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