# An On-Site InSAR Terrain Imaging Method with Unmanned Aerial Vehicles

## TL;DR

This paper introduces a new method using drones and radar to monitor terrain changes with high precision and flexibility.

## Contribution

A novel on-site InSAR imaging method using UAVs with improved phase unwrapping and speckle removal is proposed.

## Key findings

- The method achieves high spatial resolution and short revisit time for terrain monitoring.
- Validation using USGS 3DEP datasets confirms its effectiveness and efficiency in CPU time.
- Comparisons with existing techniques show the proposed method performs favorably.

## Abstract

An on-site InSAR imaging method carried out with unmanned aerial vehicles (UAVs) is proposed to monitor terrain changes with high spatial resolution, short revisit time, and high flexibility. To survey and explore a specific area of interest in real time, a combination of a least-square phase unwrapping technique and a mean filter for removing speckles is effective in reconstructing the terrain profile. The proposed method is validated by simulations on three scenarios scaled down from the high-resolution digital elevation models of the US geological survey (USGS) 3D elevation program (3DEP) datasets. The efficacy of the proposed method and the efficiency in CPU time are validated by comparing with several state-of-the-art techniques.