Application Of Remotely Sensed And Geographic Information System Data, To Quantitative Assessment Of Landslide Damage.

disaster compensation claims, landholders were required to estimate the amount of landslide damage to pasture. This damage was to be further categorised as either temporary or permanent. As part of the compensation programme, an independent damage assessment was also undertaken for more than 100 properties throughout the region. The assessment obtained total bare ground area from classified panchromatic SPOT imagery. However, the landslide scar and debris-tail components (equating to long-term and temporary damage to pasture respectively) could not be resolved on the basis of radiance levels. These components were instead determined for representative landforms in the region by a combination of photo­ interpretation and digitisationicla ssification, of 1:5000 scale aerial photographs. An estimate of the average ratio of scar to debris-tail area for an individual farm was then obtained by intersection of a regional landform map and a farm boundary overlay, using a geographic information system.