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Updated: Sep 26, 2025

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

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Published on: February 12, 2014

A Novel DEM Block Adjustment Method for Spaceborne InSAR Using Constraint Slices.

Rui Wang^1,2,3, Huiming Chai^1,2, Bin Guo⁴

¹Key Laboratory of Technology in Geo-Spatial Information Processing and Application System, Chinese Academy of Sciences, Beijing 100090, China.

Sensors (Basel, Switzerland)

|April 23, 2022

Summary

This study introduces Constraint Slices (CSs) to improve Digital Elevation Model (DEM) block adjustment in spaceborne Interferometric Synthetic Aperture Radar (InSAR) systems, enhancing accuracy in areas lacking Ground Control Points (GCPs). The new method significantly boosts DEM quality and consistency.

Keywords:

DEM block adjustment Interferometric Synthetic Aperture Radar (InSAR)constraint conditions constraint slice (CS)matrix perturbation theory

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Area of Science:

Geodesy
Remote Sensing
Photogrammetry

Background:

Bistatic Interferometric Synthetic Aperture Radar (InSAR) systems face challenges in Digital Elevation Model (DEM) block adjustment due to sparse and uneven Ground Control Point (GCP) distribution.
This issue degrades the accuracy and stability of DEM products.

Purpose of the Study:

To address the limitations of GCPs in InSAR DEM block adjustment.
To propose a novel method using Constraint Slices (CSs) to improve DEM accuracy and consistency, especially in uncontrolled areas.

Main Methods:

Theoretical analysis of adjustment parameter stability using matrix perturbation theory.
Introduction of the Constraint Slices (CSs) concept as constraints in an optimization model.
Development of a novel DEM block adjustment method for spaceborne InSAR utilizing CSs and nonlinear constraints.

Main Results:

Simulated experiments demonstrated the instability of conventional methods and validated the proposed CSs-based method.
Real experiments with spaceborne InSAR data showed significant improvements in adjustment accuracy (0.13m to 8.18m) compared to conventional methods in uncontrolled areas.
The proposed method enhanced height consistency in overlapping areas, crucial for seamless DEM production.

Conclusions:

The proposed CSs-based DEM block adjustment method effectively overcomes the limitations of GCP distribution in spaceborne InSAR systems.
This approach leads to more accurate and consistent DEMs, particularly in regions with poor ground control.
The method is vital for producing high-quality, seamless DEMs for various geodetic and remote sensing applications.