SAR interferometry for DEM generation: wide-area error assessment

Daniel Carrasco; Antoni Broquetas; Ramon Pena; Roman Arbiol; Manuel Castillo; Vincenc Pala

doi:10.1117/12.331353

20 November 1998 SAR interferometry for DEM generation: wide-area error assessment

Daniel Carrasco, Antoni Broquetas, Ramon Pena, Roman Arbiol, Manuel Castillo, Vincenc Pala

Proceedings Volume 3497, SAR Image Analysis, Modeling, and Techniques; (1998) https://doi.org/10.1117/12.331353
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

The present work consists on the generation of a DEM using ERS satellites interferometric data over a wide area (50 X 50 Km) with an error study using a high accuracy reference DEM, focusing on the atmosphere induced errors. The area is heterogeneous with flat and rough topography ranging from sea level up to 1200 m in the inland ranges. The ERS image has a 100 X 100 Km² area and has been divided in four quarters to ease the processing. The phase unwrapping algorithm, which is a combination of region growing and least squares techniques, worked out successfully the rough topography areas. One quarter of the full scene was geocoded over a local datum ellipsoid to a UTM grid. The resulting DEM was compared to a reference one provided by the Institut Cartografic de Catalunya. Two types of atmospheric error or artifacts were found: a set of very localized spots, up to one phase cycle, which generated ghost hills up to 100, and a slow trend effect which added up to 50 m to some areas in the image. Besides of the atmospheric errors, the quality of the DEM was assessed. The quantitative error study was carried out locally at several areas with different topography.

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Daniel Carrasco, Antoni Broquetas, Ramon Pena, Roman Arbiol, Manuel Castillo, and Vincenc Pala "SAR interferometry for DEM generation: wide-area error assessment", Proc. SPIE 3497, SAR Image Analysis, Modeling, and Techniques, (20 November 1998); https://doi.org/10.1117/12.331353

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KEYWORDS

Synthetic aperture radar

Interferometry

Satellites

Interferometric synthetic aperture radar

Roentgenium

Atmospheric propagation

Image acquisition

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