71.7 x 149.6 x 7.2 mm
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2025 年度，我们将7065 家入库企业划分为44 个一级行业。其中，信息传输、软件和信息技术服务业研发投入（4938.65 亿元）大幅领跑；消费电子及电气业、汽车制造业、通信传输设备业、建筑业这四个行业的研发投入规模都在2000 亿元以上。
Regions with many nearby points keep subdividing. Regions with few or no points stay large. The tree adapts to the data: dense areas get fine-grained cells, sparse areas stay coarse. The split grid is predetermined (always at midpoints), but the tree only refines cells that need it. Sparse regions stay as single large nodes while dense regions subdivide deeply.