##test pca
- 格网大小5m (越亮代表平面性越显著)
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option.ratioMax = 0.2; option.radiusFeatureCalculation = 3; option.minPtNum = 50; option.radiusNonMax = 3;
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option.ratioMax = 0.4; optio n.radiusFeatureCalculation = 3; option.minPtNum = 50; option.radiusNonMax = 3;
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demPointcloud test option.ratioMax = 0.9; option.radiusFeatureCalculation = 10; option.minPtNum = 20; option.radiusNonMax = 10;