Preprints
https://doi.org/10.5194/egusphere-2023-1698
https://doi.org/10.5194/egusphere-2023-1698
09 Aug 2023
 | 09 Aug 2023

Tracking slow-moving landslides with PlanetScope data: new perspectives on the satellite’s perspective

Ariane Mueting and Bodo Bookhagen

Abstract. PlanetScope data with daily temporal and 3-m spatial resolution hold an unprecedented potential to quantify and monitor surface displacements from space. Slow-moving landslides, however, are complex and dynamic targets that alter their topography over time. This leads to orthorectification errors, resulting in inaccurate displacement estimates when images acquired from varying satellite perspectives are correlated. These errors become particularly concerning when the magnitude of orthorectification error exceeds the signal from surface displacement which is the case for many slow-moving landslides with annual velocities of 1–10 m/yr. This study provides a comprehensive assessment of orthorectification errors in PlanetScope imagery and presents effective mitigation strategies for both unrectified L1B and orthorectified L3B data. By implementing these strategies, we achieve sub-pixel accuracy, enabling the estimation of realistic and temporally coherent displacement over landslide surfaces. The improved signal-to-noise ratio results in higher-quality disparity maps, allowing for a more detailed analysis of landslide dynamics and their driving factors.

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Ariane Mueting and Bodo Bookhagen

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2023-1698', Mahmud Muhammad, 06 Sep 2023
    • CC2: 'Reply on CC1', Mahmud Muhammad, 06 Sep 2023
    • AC1: 'Reply on CC1', Ariane Mueting, 07 Oct 2023
  • RC1: 'Comment on egusphere-2023-1698', Pascal Lacroix, 05 Oct 2023
    • AC2: 'Reply on RC1', Ariane Mueting, 13 Nov 2023
  • RC2: 'Comment on egusphere-2023-1698', Shashank Bhushan, 16 Oct 2023
    • AC3: 'Reply on RC2', Ariane Mueting, 14 Nov 2023
Ariane Mueting and Bodo Bookhagen
Ariane Mueting and Bodo Bookhagen

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Short summary
This study investigates the use of optical PlanetScope data for offset tracking of Earth-surface movement. We found that co-registration accuracy is locally degraded when outdated elevation models are used for orthorectification. To mitigate this bias, we propose to only correlate scenes acquired from common perspectives or base orthorectification on more up-to-date elevation models generated from PlanetScope data itself. This enables a more detailed analysis of landslide dynamics.