arXiv:2606.27514cs.CV2026-06被引 1

TTE通过可学习的球面分块,让地理编码器聚焦城市等关键区域。

Tessellating The Earth

论文配图:Tessellating The Earth
图 1 · 摘自论文原文
  • 用可训练的球面维诺图划分地球,动态集中表示能力。
  • 在多个地理任务上达到新基准,尤其在iNaturalist物种分类中表现最优。
  • 引入全局语义令牌,让远距离相似环境共享语义知识。

地理定位编码器能仅凭经纬度对视觉与非视觉特征进行建模。现有方法将坐标投影到固定基(如球谐函数),均匀分配表示容量,对海洋与城市投入相同资源。本文提出Tessellating the Earth(TTE),一种基于可学习球面维诺分区的地理编码器,以全可微、端到端方式将表示能力集中在关键区域。每个维诺点携带独立嵌入,并在训练中向判别性强的区域迁移。为连接局部空间结构与全局语义理解,引入全局语义令牌:一组共享的可学习概念令牌,从卫星图像中提炼语义知识,形成紧凑词汇表供编码器推理时参考,使地理上遥远但环境相似的区域共享语义。TTE在一系列地理分类与回归任务中达到新最优,尤其在iNaturalist-2018细粒度物种分类中表现最强。代码与权重已开源。

原文摘要 · Abstract (English)

Geolocation encoders, which map geographic coordinates to learned representations, are emerging as an effective means of capturing visual and non-visual characteristics from a latitude-longitude pair alone. However, existing approaches project coordinates onto fixed bases (e.g., spherical harmonics), allocating representational capacity uniformly and devoting equal resources to the open ocean and to a developing city. We introduce Tessellating the Earth (TTE), a location encoder built from learnable Spherical Voronoi partitions that concentrates representational capacity where it is needed in a fully differentiable, end-to-end manner. Each Voronoi site carries its own embedding and migrates during training toward discriminative areas. To bridge the gap between local spatial structure and global semantic understanding, we introduce \emph{global semantic tokens}: a set of shared learnable concept tokens that distill semantic knowledge from the satellite imagery into a compact vocabulary the location encoder can reference at inference, enabling geographically distant sites covering similar environments to share semantics. TTE sets a new state of the art for location encoders across a suite of geospatial classification and regression tasks, and achieves the strongest results when used as a geographic prior for fine-grained species classification on iNaturalist-2018. Code, and weights are available at https://github.com/mvrl/TTE.

地理编码球面分割语义共享卫星图像

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