| To develop economical watching system for landslide around dam reservoirs、 the authors studied the applicability of monitoring system using 3D laser profiler (ground set type) and photogrammetric method using digital camera. We carried out measurement for a landslide around a dam reservoir in north Hokkaido by the 3D laser profiler、 digital camera and GPS. The results were compared with measurement result by ordinary method like strain gage in boring hole. As a result、 though photogrammetric method is able to cover wide landslide area at a low price、 measurement error grows seriously by vegetation. As for 3D laser profiler、 though it is also able to cover wide landslide area and 3D model is easily constructed in a short time、 the equipment is expensive and measurement error grows seriously by vegetation. To keep measurement error in allowable range、 signs like stake or artificial structures like concrete frame which do not covered by vegetation should be measured in and out of landslide. In conclusion、 these remote measurement technologies were applicable to landslide without vegetation、 or landslide having or being set signs or artificial structures which does not covered by vegetation in and out of it. |
