室内几何条件对土壤高光谱数据波动性的影响

Effect of Geometric Conditions on Soil Hyperspectral Data Fluctuate Characteristic in Laboratory Test

利用方差分析方法,研究了光源照射角度、探头距离、光源距离等3个测试几何条件对室内土壤高光谱数据波动性的影响,并探讨了其物理机理.结果表明,探头距离对室内高光谱样本曲线的波动性影响不明显,而光源照射角度、光源距离对室内高光谱样本曲线波动性影响在所有的研究波段都达到了极显著水平;两个因素之间的交互作用的显著性与因素和波段有关.3个因素间的交互作用不显著.在本试验研究条件下,15°的光源照射角度、15cm的探头距离和30cm的光源照射距离是最理想的室内测试几何条件组合.

The fluctuate characteristic of soil hyperspectral is studied by variance analys is of geometric conditions, such as the angle of the beam, the distance between sensor and soil surface, the distance between lamp and soil surface in laborator y test and the physics reasons. The results show that the effect of the distance between sensor and soil surface on soil hyperspectral fluctuate characteristic is not significant, while the angle of the beam and the distance between lamp an d soil surface have most significant effect on soil hyperspectral fluctuate char acteristic at all selected bands. The significances of interactions between angl es and lamp distances related to selected bands and the interaction of the three factors is not significant.15°,15 cm, and 30 cm are recommended as optimiz ation values of angle, sensor distance and lamp distance.