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Urban DEM generation, analysis and enhancements using TanDEM-X

Rossi, Cristian and Gernhardt, Stefan (2013) Urban DEM generation, analysis and enhancements using TanDEM-X. ISPRS Journal of Photogrammetry and Remote Sensing, 85C, pp. 120-131. Elsevier. doi: 10.1016/j.isprsjprs.2013.08.006. ISSN 0924-2716.

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This paper analyses the potential of the TanDEM-X mission for the generation of urban Digital Elevation Models (DEMs). The high resolution of the sensors and the absence of temporal decorrelation are exploited. The interferometric chain and the problems encountered for correct mapping of urban areas are analysed first. The operational Integrated TanDEM-X Processor (ITP) algorithms are taken as reference. The ITP main product is called the raw DEM. Whereas the ITP coregistration stage is demonstrated to be robust enough, large improvements in the raw DEM such as fewer percentages of phase unwrapping errors, can be obtained by using adaptive fringe filters instead of the conventional ones in the interferogram generation stage. The shape of the raw DEM in the layover area is also shown and determined to be regular for buildings with vertical walls. Generally, in the presence of layover, the raw DEM exhibits a height ramp, resulting in a height underestimation for the affected structure. Examples provided confirm the theoretical background. The focus is centred on high resolution DEMs produced using spotlight acquisitions. In particular, a raw DEM over Berlin (Germany) with a 2.5 meter raster is generated and validated. For this purpose, ITP is modified in its interferogram generation stage by adopting the Intensity Driven Adaptive Neighbourhood (IDAN) algorithm. The height Root Mean Square Error (RMSE) between the raw DEM and a reference is about 8 meters for the two classes defining the urban DEM: structures and non-structures. The result can be further improved for the structure class using a DEM generated with Persistent Scatterer Interferometry. A DEM fusion is thus proposed and a drop of about 20% in the RMSE is reported.

Item URL in elib:https://elib.dlr.de/84043/
Document Type:Article
Title:Urban DEM generation, analysis and enhancements using TanDEM-X
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Journal or Publication Title:ISPRS Journal of Photogrammetry and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.isprsjprs.2013.08.006
Page Range:pp. 120-131
Keywords:TanDEM-X, Urban DEM, InSAR processing, PSI-DEM, DEM fusion
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Projekt TanDEM-X (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Rossi, Cristian
Deposited On:02 Sep 2013 15:27
Last Modified:06 Sep 2019 15:28

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