Spot built in Brittany (BDTopo 2016)
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Envelope of surfaces containing the frame (buffer zones around frames with more than 20 m² of ground right-of-way) calculated from BDTopo 2016
基于BDTopo 2016地形数据库计算得到的曲面包络范围,其所包含的图幅特指围绕地面通行用地面积超过20平方米的图幅所形成的缓冲区



