Beyond Memory Limits: A Hierarchical Spatio-Temporal Map Representation for Large-Scale 3D Autonomous Exploration

Abstract:Autonomous UAV exploration is increasingly used for large-scale surveying and inspection in inaccessible or disaster-affected environments, where onboard memory and computational resources are often severely constrained. Most existing UAV exploration systems maintain globally queryable geometric map representations for motion planning and exploration decision-making, causing memory consumption and spatial-query costs to increase with the explored area. Robot-centric local mapping bounds dense-map memory and computation but discards global task context needed for long-horizon this http URL present FLAVOR, a hierarchical spatio-temporal framework that confines dense metric geometry to a robot-centric local map while retaining compact global observation and task context. At the observation level, lightweight LiDAR-keyframe visibility records preserve ray-wise evidence for frontier reasoning. At the task level, unresolved frontiers beyond the local-map extent are retained as compact pending tasks associated with odometry anchors. A sparse topological graph connects these anchors through retained routes for future this http URL returning to a task region, FLAVOR reconstructs the frontier and exploration viewpoint from observations, while the topological route is instantiated and validated against the current local map before execution. Dense-map capacity remains fixed as exploration expands, with exploration-dependent memory growth confined to compact observation and task this http URL achieves 31.98--41.88% shorter exploration time and a 94--99% smaller map memory footprint than the best baseline that completes all three simulated scenes. In real-world deployments, it reduces this footprint by 92.67% in the forest and 62.42% at the construction site relative to an explicit point-cloud ikd-tree while preserving long-term task continuity under constrained onboard resources.

Robotics (cs.RO)

arXiv:2611.11489 [cs.RO]

(or arXiv:2611.11489v1 [cs.RO] for this version)

https://doi.org/10.48550/arXiv.2611.11489 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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