Validation of spot-5 satellite imagery for geological hazard identification and risk assessment for landslides, mud and debris flows in Matagalpa, Nicaragua

  • Haeberlin Y
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This analysis addresses the suitability and potential for the use
of high-resolution SPOT-5 remote imagery for geological hazard identification
and risk assessment in Matagalpa, Nicaragua. SPOT-5 products are
complementary tools in the process of risk analysis and in combination
with digital elevation models (DEMs) are particularly helpful for
determining large, kilometer-sized hazardous phenomena for watersheds.
At Matagalpa, a pseudo-color 2.5 m SPOT-5 image draped over a DEM
for 3D simulation is tailored for mapping landslide scarps and recent
debris flow deposits at scales up to 1:25'000, but is inappropriate
for identifying mud flow events. In contrast, the input of SPOT-5
derived products to hazard susceptibility mapping is limited, since
among the prime factors controlling terrain instability (slope, geology,
hydrography), only information about geological lineaments can be
recovered. A few second-order risk factors, such as barren soils
and deforested areas can be extrapolated from SPOT-5 land cover and
change detection maps. For vulnerability issues, SPOT-5 images are
a relevant source of spatial information on threatened elements (settlements,
road infrastructure), if there are neither quality, nor current maps
of the area available.

Author-supplied keywords

  • Developing Countries
  • Geology
  • Hazards
  • Identification
  • Landslides
  • Monitoring
  • Remote Sensing

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  • Y Haeberlin

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