Bordeaux metropolis level curve

This dataset represents the level curves of 2001 and 2012 in the territory of the Urban Community of Bordeaux (La Cub). They are spaced 50 cm apart in elevation. It also represents the field level curves on Bordeaux Métropole resulting from the photogrammetric and lasergrammetric airborne acquisition of summer 2012. The territory of Bordeaux Métropole plus an overflow of 300 m is covered. The terrain level curves are used for the cartographic representation of the terrain. They are the result of automatic extraction, from a simplified numerical terrain model, of the lines formed by the points of the terrain located at the same altitude. The equidistance between each level curve is 50 cm.本数据集包含波尔多城市共同体（Urban Community of Bordeaux，La Cub）辖区内2001年与2012年的地形等高线（level curve），各等高线的高程间距为50厘米。 本数据集同时涵盖波尔多大都会区（Bordeaux Métropole）的野外地形等高线数据，此类数据源自2012年夏季开展的航空摄影测量与激光摄影测量机载采集作业。数据集覆盖范围包含波尔多大都会区全域及向外延伸300米的缓冲区域。地形等高线可用于地形的制图表达，其通过对简化数值地形模型中同一海拔高度的地形点所构成的线条进行自动提取而得到。 各条地形等高线之间的高程间距为50厘米。