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Advisor(s)
Abstract(s)
Assessing the number and locations of exposed
people is a crucial step in landslide risk management and
emergency planning. The available population statistical data
frequently have insufficient detail for an accurate assessment
of potentially exposed people to hazardous events, mainly
when they occur at the local scale, such as with landslides.
The present study aims to apply dasymetric cartography to
improving population spatial resolution and to assess the potentially
exposed population. An additional objective is to
compare the results with those obtained with a more common
approach that uses, as spatial units, basic census units,
which are the best spatial data disaggregation and detailed
information available for regional studies in Portugal. Considering
the Portuguese census data and a layer of residential
building footprint, which was used as ancillary information,
the number of exposed inhabitants differs significantly according
to the approach used. When the census unit approach
is used, considering the three highest landslide susceptible
classes, the number of exposed inhabitants is in general overestimated.
Despite the associated uncertainties of a general
cost–benefit analysis, the presented methodology seems to
be a reliable approach for gaining a first approximation of
a more detailed estimation of exposed people. The approach
based on dasymetric cartography allows the spatial resolution
of population over large areas to be increased and enables the
use of detailed landslide susceptibility maps, which are valuable
for improving the exposed population assessment.
Description
Keywords
Population exposure Landslide Risk analysis Dasymetric cartography
Pedagogical Context
Citation
Garcia, R. A. C., Oliveira, S. C., & Zêzere, J. L. (2016). Assessing population exposure for landslide risk analysis using dasymetric cartography. Nat. Hazards Earth Syst. Sci., 16(12), 2769–2782. https://doi.org/10.5194/nhess-16-2769-2016
Publisher
Copernicus Publications