New Strategies for European Remote Sensing pages:627-634
Symposium of the European Association of Remote Sensing Laboratories edition:24 location:Dubrovnik, Croatia date:25-27 May 2004
Landslides are the result of processes, which include geological, geomorphological
and meteorological factors. The most important factors are lithology, structure, drainage,
slope, land-cover, and geomorphology. In order to make a landslide hazard map, all these factors
need to be analysed in order to define the instability in a region. Remotely sensed data provide
valuable information for determining the occurrence of landslides, such as recent land-cover and
• The method of landslide hazard analysis, which is applied in the Thua-Thien-Hue Province
(TTH), is based on the methodology of Chung and Shaw (2000) with the following
assumptions: Future landslides will occur under circumstances similar to the ones of past
landslides in either the study area or in areas in which experts have obtained their knowledge
on the relationships between the causal factors and the occurrences of the landslides.
• Spatial GIS data representing the causal factors can be used to formulate the future landslide
Data integration was carried out using the ordinal scale (qualitative) relative weighting rating
technique to give a Landslide Hazard Index (LHI) value. The breaks in the LHI frequency
diagram were used to delineate various landslide hazard zones, namely, very low, low, moderate,
high and very high. Field data on landslides were employed to evaluate and validate landslide
hazard zonation map (Saha, 2002).
This paper describes the methodology used and the generation of seven thematic layers: 1) recent
land cover; 2) geological fracture zone map; 3) weathering rock map; 4) geotechnical map; 5)
geomorphological map; 6) slope map and 7) DEM.
It is shown that the potential landslide hazard map can be established by statistical correlation of
landslide frequency with these seven factors. The applicability of the map is shown by the fact
that the Vietnamese government and NGO-projects take account of the results for their
development planning in TTH.