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Landcover-Dependent Assessment of the Relative Height Accuracy in TanDEM-X DEM Products

Gonzalez, Carolina and Rizzoli, Paola (2018) Landcover-Dependent Assessment of the Relative Height Accuracy in TanDEM-X DEM Products. IEEE Geoscience and Remote Sensing Letters, 15 (12), 1892 -1896. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/LGRS.2018.2864774. ISSN 1545-598X.

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Official URL: https://ieeexplore.ieee.org/document/8463597


Digital elevation models (DEMs) are extensively used for a variety of scientific and commercial applications. For the global TanDEM-X DEM one of the main performance parameters is the relative height accuracy, which is specified to be under 2 m for flat terrain. Land cover types where the radar signal penetrates into a volume, as forest and ice, are excluded from this specification. Knowing the accuracy of the DEM for a specific land cover type is essential for applications relying on it, such as navigation applications, gradient and aspect estimations and others. This paper is meant to be as add-on the global relative analysis presented in [1]. Here, we present a characterization of the relative height accuracy based on the interferometric coherence assessing the performance for every class defined by the CCI Land Cover Maps at a continental and global basis. This characterization raises the awareness of the advantages and limitations of the DEM for each specific application and helps scientists using the TanDEM-X DEM to interpret their results. Additionally an estimation of the relative height accuracy for acquisitions where volume decorrelation is present is locally performed using the high frequency component of repeat-pass DEMs differences. For two particular land cover types both methods are compared. The main source of errors in the DEM generation is clearly associated with strong inhomogeneous Signal returns, becoming a driving factor on the actual accuracy of the estimated mean phase center height.

Item URL in elib:https://elib.dlr.de/122700/
Document Type:Article
Title:Landcover-Dependent Assessment of the Relative Height Accuracy in TanDEM-X DEM Products
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gonzalez, CarolinaUNSPECIFIEDhttps://orcid.org/0000-0002-9340-1887UNSPECIFIED
Rizzoli, PaolaUNSPECIFIEDhttps://orcid.org/0000-0001-9118-2732UNSPECIFIED
Date:December 2018
Journal or Publication Title:IEEE Geoscience and Remote Sensing Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:1892 -1896
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Land cover type, DEM accuracy, Relative height accuracy, TanDEM-X
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:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Gonzalez, Carolina
Deposited On:05 Nov 2018 15:24
Last Modified:08 Nov 2023 10:38

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