MetroGS: Efficient and Stable Reconstruction of Geometrically Accurate High-Fidelity Large-Scale Scenes

• URL: http://arxiv.org/abs/2511.19172v1
• Date: Mon, 24 Nov 2025 14:34:19 GMT
• Title: MetroGS: Efficient and Stable Reconstruction of Geometrically Accurate High-Fidelity Large-Scale Scenes
• Authors: Kehua Chen, Tianlu Mao, Zhuxin Ma, Hao Jiang, Zehao Li, Zihan Liu, Shuqi Gao, Honglong Zhao, Feng Dai, Yucheng Zhang, Zhaoqi Wang,
• Abstract summary: We introduce MetroGS, a novel framework for efficient and robust reconstruction in complex urban environments.<n>Our method is built upon a distributed 2D Gaussian Splatting representation as the core foundation.<n>Experiments on large-scale urban datasets demonstrate that MetroGS achieves superior geometric accuracy, rendering quality.
• Score: 20.601722393809244
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recently, 3D Gaussian Splatting and its derivatives have achieved significant breakthroughs in large-scale scene reconstruction. However, how to efficiently and stably achieve high-quality geometric fidelity remains a core challenge. To address this issue, we introduce MetroGS, a novel Gaussian Splatting framework for efficient and robust reconstruction in complex urban environments. Our method is built upon a distributed 2D Gaussian Splatting representation as the core foundation, serving as a unified backbone for subsequent modules. To handle potential sparse regions in complex scenes, we propose a structured dense enhancement scheme that utilizes SfM priors and a pointmap model to achieve a denser initialization, while incorporating a sparsity compensation mechanism to improve reconstruction completeness. Furthermore, we design a progressive hybrid geometric optimization strategy that organically integrates monocular and multi-view optimization to achieve efficient and accurate geometric refinement. Finally, to address the appearance inconsistency commonly observed in large-scale scenes, we introduce a depth-guided appearance modeling approach that learns spatial features with 3D consistency, facilitating effective decoupling between geometry and appearance and further enhancing reconstruction stability. Experiments on large-scale urban datasets demonstrate that MetroGS achieves superior geometric accuracy, rendering quality, offering a unified solution for high-fidelity large-scale scene reconstruction.

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