Object-Oriented Change Detection for Landslide Rapid Mapping
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Abstract:
A complete multitemporal landslide inventory, ideally updated after each major event, is essential for quantitative landslide hazard assessment. However, traditional mapping methods, which rely on manual interpretation of aerial photographs and intensive field surveys, are time consuming and not efficient for generating such event-based inventories. In this letter, a semi-automatic approach based on object-oriented change detection for landslide rapid mapping and using very high resolution optical images is introduced. The usefulness of this methodology is demonstrated on the Messina landslide event in southern Italy that occurred on October 1, 2009. The algorithm was first developed in a training area of Altolia and subsequently tested without modifications in an independent area of Itala. Correctly detected were 198 newly triggered landslides, with user accuracies of 81.8% for the number of landslides and 75.9% for the extent of landslides. The principal novelties of this letter are as follows: 1) a fully automatic problem-specified multiscale optimization for image segmentation and 2) a multitemporal analysis at object level with several systemized spectral and textural measurements.Natural hazard
Disaster risk reduction
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Landslide RS survey includes the landslide recognition, the collection of the basic information, and the spatial analysis. With the Tiantaixiang landslide RS as an example, this paper illustrates the utilization of “special points” to determine the boundary and influence zone, movement characteristics and scale of the landslide. Landslide RS monitoring can be divided into direct RS monitoring and indirect RS monitoring. It is difficult to determine the exact time for large scale high velocity landslide movement, the scale of landslide movement is relatively small compared with the resolution of the satellite image, and as RS data are discontinuous and rather expensive, they are not quite suitable for RS direct landslide monitoring. Indirect monitoring means monitoring the environmental change caused by landslide activities. The Yigong landslide RS serves as another example to illustrate RS monitoring of lake change, ecological destruction and new landslides caused by landslide dam burst.Landslide RS evaluation means the evaluation of the stability, the prediction of the future activities, the detection of the affecting factors and the evaluation of the regional hazards caused by landslide development. Tiantaixiang and Qianjiangpin landslides and regional landslides in the Three Gorge area all serve as examples.
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The paper introduces Jianfengwei Landslide hazard and analyzes the regional geological environment thereof.According to the genesis,development and previous treatment of the landslide and the dynamic monitoring result of its deformation,it is found that the engineering is the causes and the action of underwater and precipitation are the inducements.Then the stability analysis and the landslide thrust calculation are carried out in connection with this hazard's features;and the corresponding treatment measures are proposed following the principal of one time radical cure without any future trouble.As a result,the later monitoring shows that the landslide body is stable.
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