New method of landslide monitoring based on close-range photogrammetry

A new method of landslide monitoring is presented by applying the close-range photogrammetry technology into landslide monitoring without surveying control points again,which is convenient,fast and non-contact.This method uses the rotated photogrammetry or parallel photography way to take a group of photographs for monitoring area.Then the DEM model of target monitoring area is obtained based on photography measurement principle.The absolute displacement and the local variation of landslide during the monitoring period can be calculated by automatic matching of control points and overlaying analysis of two stage DEM models.Experimental results using synthetic data indicate that the presented method can be effective for a rapid and exact monitoring.