Work

A Radargrammetry Algorithm for High-Resolution SAR Satellite Constellations

Year: 2025

Type: article

Abstract: The recent development of commercial high-resolution Synthetic Aperture Radar (SAR) satellite constellations provides the opportunity to acquire SAR data with resolutions of 1 m or less with a high temporal repeat rate. One potential use of this technology is the construction of high-resolution digital surface models (DSMs) for use in monitoring rapid topographic changes, for example coastal erosion caused by a hurricane landfall. Here we describe a stereo radargrammetry algorithm that is well suited to imagery collected from both parallel and crossing orbit geometries. An epipolar geometry is described to enable its efficient operation. An open-source implementation of the algorithm has been published. DSMs from three coastal test sites with varying terrain properties and surface features are generated from SAR imagery collected in a variety of imaging modes. The DSMs generated from all configurations demonstrate good agreement with reference elevation models, even in low relief regions, with comparable performance for parallel and crossing orbits. A comparison of a radargrammetric DSM to a lidar surface model shows the algorithm can accurately measure heights in vegetated and non-vegetated coastal areas, which may be useful for damage assessment and change detection tasks following landfall.

Source: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

DOI: 10.1109/jstars.2025.3616765

Authors: Steven Beninati, Stephen Frasier

Institution: University of Massachusetts Amherst

Language: English

Topic: Synthetic Aperture Radar (SAR) Applications and Techniques

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,800

Funder: Office of Naval Research