Micro-sheeting of granite and its relationship with landsliding specifically after the heavy rainstorm in June 1999, Hiroshima Prefecture, Japan

Certain types of granite in mountainous areas are microscopically sheeted to a depth of 50 m due to unloading under the stress field that reflects slope morphology. Micro-sheets generally strike parallel to major slope surfaces and gently dip downslope, forming cataclinal overdip slopes. The cataclinal overdip slope accelerates creep movement of micro-sheeted granite, which in turn loosens and disintegrates granite via the widening or neoformation of cracks, probably in combination with stress release, temperature change, and changes in water content near the ground surface. The surface portion of micro-sheeted granite is thus loosened with a well-defined basal front, which finally slides in response to heavy rain. Innumerable landslides of this type occurred in Hiroshima Prefecture, western Japan, following the heavy rainstorm of 29 June 1999. Following such landslides, the weathering of micro-sheeted granite exposed on the landslide scar recommences, setting the stage for future landslide.     

地图合并中基于叠置方法的特征点匹配可靠性检验

不同来源的矢量数据集合并时,必须以相匹配的同名点为基础进行数据集校准,同名点匹配结果的可靠性直接影响数据集校准的正确性,目前还没有一个有效的方法判别同名点是否正确地被匹配.为确保输出结果确实源于各数据集中的同名点,必须对同名点坐标输出结果的可靠性进行统计检验.该文基于叠置方法对来自不同矢量数据集中的同名点特征匹配结果进行检验,以确保点特征匹配结果的可靠性.实践证明,通过显著性检验,可确保数据集校准结果的正确性,探测错误匹配点的位置,能较好地控制Rubber-Sheeting变换处理.