Wetland surface water detection from multipath SAR images using gaussian process-based temporal interpolation

Yukio Endo, Meghan Halabisky, L. Monika Moskal, Shunichi Koshimura

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    Wetlands provide society with a myriad of ecosystem services, such as water storage, food sources, and flood control. The ecosystem services provided by a wetland are largely dependent on its hydrological dynamics. Constant monitoring of the spatial extent of water surfaces and the duration of flooding of a wetland is necessary to understand the impact of drought on the ecosystem services a wetland provides. Synthetic aperture radar (SAR) has the potential to reveal wetland dynamics. Multitemporal SAR image analysis for wetland monitoring has been extensively studied based on the advances of modern SAR missions. Unfortunately, most previous studies utilized monopath SAR images, which result in limited success. Tracking changes in individual wetlands remains a challenging task because several environmental factors, such as wind-roughened water, degrade image quality. In general, the data acquisition frequency is an important factor in time series analysis. We propose a Gaussian process-based temporal interpolation (GPTI) method that enables the synergistic use of SAR images taken from multiple paths. The proposed model is applied to a series of Sentinel-1 images capturing wetlands in Okanogan County, Washington State. Our experimental analysis demonstrates that the multiple path analysis based on the proposed method can extract seasonal changes more accurately than a single path analysis.

    Original languageEnglish
    Article number1756
    JournalRemote Sensing
    Volume12
    Issue number11
    DOIs
    Publication statusPublished - 2020 Jun 1

    Keywords

    • Drought
    • Gaussian process
    • Synthetic aperture radar
    • Time series analysis
    • Wetlands

    ASJC Scopus subject areas

    • Earth and Planetary Sciences(all)

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