Estimation of the characteristics of the structure under crowns in the hypersupectral imagery
-Case of Prunus×yedoensis roadside tree in Rissho University-
2006 Volume 45 Issue 5 Pages 4-12
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2006 Volume 45 Issue 5 Pages 4-12
The objective of this study is to clarify the effect of the surface under tree crown to the remote sensing imagery.Using the airborne hyperspectral sensor imagery, the second differential absorbance in row of trees of Prunus × yedoensis in Rissho University was calculated.In reflectance of the road and grass under crown, the values in the infrared region was different each other.But the reflectance spectrum was similar.The influence of the different surface under crown was not able to be judged from the difference of the value of reflectance.On the other hand, the second differential absorbance showed the difference of the surface under crown.The difference appeared at a point of the peak and trough in the distribution of the second differential absorbance.The classification error in the crown part was about 20% in reflectance, and about 2% in the second differential absorbance.About 70% of the edge of the crown where was above the road was recognized as the result of the influence of the road from the first principal component score.
This study showed that the difference of the surface under the crown could be detected by the second differential absorbance of the forest structure calculated by the hyperspectral imagery.
