PolyFootNet: Extracting Polygonal Building Footprints in Off-Nadir Remote Sensing Images

• URL: http://arxiv.org/abs/2408.08645v4
• Date: Tue, 22 Apr 2025 09:27:53 GMT
• Title: PolyFootNet: Extracting Polygonal Building Footprints in Off-Nadir Remote Sensing Images
• Authors: Kai Li, Yupeng Deng, Jingbo Chen, Yu Meng, Zhihao Xi, Junxian Ma, Chenhao Wang, Maolin Wang, Xiangyu Zhao,
• Abstract summary: PolyFootNet is a novel deep-learning framework that directly outputs polygonal building footprints without requiring external post-processing steps.<n>A key contribution of PolyFootNet is introducing the Self Offset Attention mechanism, grounded in Nadaraya-Watson regression, to effectively mitigate the accuracy discrepancy observed between low-rise and high-rise buildings.
• Score: 27.58630526006379
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Extracting polygonal building footprints from off-nadir imagery is crucial for diverse applications. Current deep-learning-based extraction approaches predominantly rely on semantic segmentation paradigms and post-processing algorithms, limiting their boundary precision and applicability. However, existing polygonal extraction methodologies are inherently designed for near-nadir imagery and fail under the geometric complexities introduced by off-nadir viewing angles. To address these challenges, this paper introduces Polygonal Footprint Network (PolyFootNet), a novel deep-learning framework that directly outputs polygonal building footprints without requiring external post-processing steps. PolyFootNet employs a High-Quality Mask Prompter to generate precise roof masks, which guide polygonal vertex extraction in a unified model pipeline. A key contribution of PolyFootNet is introducing the Self Offset Attention mechanism, grounded in Nadaraya-Watson regression, to effectively mitigate the accuracy discrepancy observed between low-rise and high-rise buildings. This approach allows low-rise building predictions to leverage angular corrections learned from high-rise building offsets, significantly enhancing overall extraction accuracy. Additionally, motivated by the inherent ambiguity of building footprint extraction tasks, we systematically investigate alternative extraction paradigms and demonstrate that a combined approach of building masks and offsets achieves superior polygonal footprint results. Extensive experiments validate PolyFootNet's effectiveness, illustrating its promising potential as a robust, generalizable, and precise polygonal building footprint extraction method from challenging off-nadir imagery. To facilitate further research, we will release pre-trained weights of our offset prediction module at https://github.com/likaiucas/PolyFootNet.

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