三维激光扫描仪对平缓地形扫描作业时，存在点密度不均匀、冗余数据多、有效扫描半径小等限制。为减少上述限制，提高作业效率，在深入分析三维激光扫描仪工作原理的基础上，提出分区扫描方法：根据到扫描仪中心距离的不同，将扫描范围分为若干环状区域，每个环状区域分别对应不同的竖直扫描夹角，各区域基于扫描点密度均衡的原则，设置不同的扫描参数。试验结果表明：竖直扫描角度分别为88°～89°、85°～88°、70°～85°、45°～70°的分区扫描方法为较理想的方法，与整体扫描方式相比，前者在作业效率、有效扫描半径等方面均有明显优势，数据点密度分布得到很大改善，利用效率明显提高。%By scanning flat terrain ,3D laser scanner has the limitation of uneven point density ,high redundancy data and small effective scanning radius .In order to decrease these limitation and improve work efficiency ,it puts forward a sub-regional scanning method based on a thorough understanding of the operational principle of 3D laser scanner .The principles are as followed :divide scanning region into several annular sub-regions based on the distance to the center of 3D laser scanner ,then every annular sub-region corresponds to a vertical scanning angle .Based on the principle of point density balanced ,every sub-region is scanned respectively with different parameters set .Test result shows that setting vertical scanning angle with 88°~89° ,85°~88° ,70°~85° ,45°~70°separately is a relatively ideal sub-regional scanning method . Compared with the overall scanning method ,the former method has obvious advantage in the respects of working efficiency and effective scanning radius .Sub-regional scanning method also greatly improves the data density distribution ,and improves the utilization efficiency of scanning points .
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