Cross-sensor super-resolution of irregularly sampled Sentinel-2 time series

• URL: http://arxiv.org/abs/2404.16409v1
• Date: Thu, 25 Apr 2024 08:36:09 GMT
• Title: Cross-sensor super-resolution of irregularly sampled Sentinel-2 time series
• Authors: Aimi Okabayashi, Nicolas Audebert, Simon Donike, Charlotte Pelletier,
• Abstract summary: We introduce BreizhSR, a new dataset for 4x super-resolution of Sentinel-2 time series. We show that using multiple images significantly improves super-resolution performance. We observe a trade-off between spectral fidelity and perceptual quality of the reconstructed HR images.
• Score: 2.9748898344267785
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Satellite imaging generally presents a trade-off between the frequency of acquisitions and the spatial resolution of the images. Super-resolution is often advanced as a way to get the best of both worlds. In this work, we investigate multi-image super-resolution of satellite image time series, i.e. how multiple images of the same area acquired at different dates can help reconstruct a higher resolution observation. In particular, we extend state-of-the-art deep single and multi-image super-resolution algorithms, such as SRDiff and HighRes-net, to deal with irregularly sampled Sentinel-2 time series. We introduce BreizhSR, a new dataset for 4x super-resolution of Sentinel-2 time series using very high-resolution SPOT-6 imagery of Brittany, a French region. We show that using multiple images significantly improves super-resolution performance, and that a well-designed temporal positional encoding allows us to perform super-resolution for different times of the series. In addition, we observe a trade-off between spectral fidelity and perceptual quality of the reconstructed HR images, questioning future directions for super-resolution of Earth Observation data.

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