A deep multiple instance learning approach based on coarse labels for high-resolution land-cover mapping

• URL: http://arxiv.org/abs/2510.06769v1
• Date: Wed, 08 Oct 2025 08:50:39 GMT
• Title: A deep multiple instance learning approach based on coarse labels for high-resolution land-cover mapping
• Authors: Gianmarco Perantoni, Lorenzo Bruzzone,
• Abstract summary: The quantity and the quality of the training labels are central problems in high-resolution land-cover mapping.<n>We propose a method that trains pixel-level multi-class classifiers and predicts low-resolution labels.
• Score: 13.80382608774738
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The quantity and the quality of the training labels are central problems in high-resolution land-cover mapping with machine-learning-based solutions. In this context, weak labels can be gathered in large quantities by leveraging on existing low-resolution or obsolete products. In this paper, we address the problem of training land-cover classifiers using high-resolution imagery (e.g., Sentinel-2) and weak low-resolution reference data (e.g., MODIS -derived land-cover maps). Inspired by recent works in Deep Multiple Instance Learning (DMIL), we propose a method that trains pixel-level multi-class classifiers and predicts low-resolution labels (i.e., patch-level classification), where the actual high-resolution labels are learned implicitly without direct supervision. This is achieved with flexible pooling layers that are able to link the semantics of the pixels in the high-resolution imagery to the low-resolution reference labels. Then, the Multiple Instance Learning (MIL) problem is re-framed in a multi-class and in a multi-label setting. In the former, the low-resolution annotation represents the majority of the pixels in the patch. In the latter, the annotation only provides us information on the presence of one of the land-cover classes in the patch and thus multiple labels can be considered valid for a patch at a time, whereas the low-resolution labels provide us only one label. Therefore, the classifier is trained with a Positive-Unlabeled Learning (PUL) strategy. Experimental results on the 2020 IEEE GRSS Data Fusion Contest dataset show the effectiveness of the proposed framework compared to standard training strategies.

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