Mass Movement

Recommended Practice: Exposure Mapping

English

Teaser Recommended Practice: 

Mapping the extent of a natural hazard (e.g., assessing areas with a high risk) or disaster is a first step in disaster risk management and emergency response. Subsequently, exposure mapping enables the estimation of the impact of hazards or disasters, for example, regarding the number of affected inhabitants or infrastructure. The following practice shows the use of Quantum GIS to analyze a disaster extent map in combination with auxiliary data such as population or land cover data.

Flowchart Recommended Practices: 

Related Software: 

Objective: 

The objective of this practice is to estimate the exposure of a natural hazard or disaster. As an example, the number of inhabitants affected by a flood event is estimated. The joint use of the flood mask, created by the Recommended Practice: Flood Mapping, and the WorldPop data set constitutes a viable solution to quickly estimate the impact of the flood regarding the population. The proposed methodology is a universal practice which combines a simple approach based on open-source software and free of charge data together with a beforehand created map covering the extend of a natural hazard or disaster.

Disaster Cycle Phase: 

  • Mitigation
  • Preparedness
  • Recovery & Reconstruction
  • Relief & Response

Main Hazards: 

  • Drought
  • Earthquake
  • Extreme Temperature
  • Forest Fire
  • Flood
  • Insect Infestation
  • Mass Movement
  • Pollution
  • Severe Storm
  • Tsunami
  • Volcanic Eruption

Test Site: 

Malawi

Context: 

The practice was applied in the context of the flood event in Malawi in January 2015. Since December 2014, heavy rains affected Malawi causing rivers to overflow. The flooded area in this analysis covered a part of the Nsanje district around Chiromo.

Applicability: 

This practice can be applied globally. Besides of the beforehand created hazard or disaster extent map, the practice does not need specific near real-time data as it is based on population, land cover, or other auxiliary geodata archives. The WorldPop data set provides population data for Africa, Asia as well as Central and South America with a spatial resolution of 100 meters. The Landcover30 data base provides global landcover data with a spatial resolution of about 30 meters.

ERS-1,2

Disaster Cycle Phase: 

  • Preparedness

Space Technology/Product and Application: 

  • EO/RS
  • Risk Map

Field of Application: 

  • Disaster Type
  • Mass Movement

Satellite: 

Undefined

Detailed rockslide mapping in northern Norway with small baseline and persistent scatterer interferometric SAR time series methods

Rockslides have a high socioeconomic and environmental importance in many countries. Norway is particularly susceptible to large rockslides due to its many fjords and steep mountains. One of the most dangerous hazards related with rock slope failures are tsunamis that can lead to large loss of life. It is therefore very important to systematically identify potential unstable rock slopes. Traditional landslide monitoring techniques are expensive and time consuming.

External Contact Person: 

T.R. Lauknes

Email: 

Tom-Rune.Lauknes [at] norut.no
Undefined

Bibliographic reference: 

Lauknes, T. R., Shanker, A. P., Dehls, J. F., Zebker, H. A., Henderson, I. H. C., & Larsen, Y. (2010). Detailed rockslide mapping in northern Norway with small baseline and persistent scatterer interferometric SAR time series methods. Remote Sensing of Environment114(9), 2097-2109.

SPOT-5

Disaster Cycle Phase: 

  • Relief & Response

Space Technology/Product and Application: 

  • EO/RS
  • Landslide Hazard Assessment
  • Landslide Monitoring

Field of Application: 

  • Disaster Type
  • Mass Movement

Satellite: 

Undefined

Comparison between automated and manual mapping of typhoon triggered landslides from SPOT-5 imagery

Two large tropical cyclones struck Taiwan in the summer of 2004 and landslides triggered by these events caused not only casualties and housing damage but also produced large volumes of sediment that entered rivers and reservoirs. For reservoir and watershed management it is important to quickly identify the location and areal extent of new landslides for coordinating

External Contact Person: 

K. Chang

Email: 

ktchang [at] ntu.edu.tw
Undefined

Bibliographic reference: 

Borghuis, A. M., Chang, K., & Lee, H. Y. (2007). Comparison between automated and manual mapping of typhoon‐triggered landslides from SPOT‐5 imagery. International Journal of Remote Sensing28(8), 1843-1856.

IRS-1D

Disaster Cycle Phase: 

  • Mitigation

Space Technology/Product and Application: 

  • EO/RS
  • Landslide Hazard Assessment

Field of Application: 

  • Disaster Type
  • Mass Movement
Undefined

Geospatial technology in landslide mitigation - A case study in Nilgiris District

Landslides constitute one of the major natural catastrophes, which account for considerable loss of life and damage to communication routes, human settlements, agricultural and forestland. Most of the terrain in mountainous areas have been subjected to slope failures under the influence of variety of terrain factors and figured by events such as extreme rainfall or earthquake. In India, landslides are occurring frequently in Himalayan region in North and Western Ghats in South.

External Contact Person: 

Email: 

Undefined

Bibliographic reference: 

VIDHYA, D. GEOSPATIAL TECHNOLOGY IN LANDSLIDE MITIGATION–A CASE STUDY IN NILGIRIS DISTRICT.

IKONOS, Quickbird

Disaster Cycle Phase: 

  • Mitigation

Space Technology/Product and Application: 

  • EO/RS
  • Landslide Hazard Assessment

Field of Application: 

  • Disaster Type
  • Mass Movement

Satellite: 

Undefined

Landslide Susceptibility Mapping using Image Satellite and GIS Technology

Landslides are among the great destructive factors which cause lots of fatalities and financial losses all over the world every year. The aim of the research was landslide susceptibility mapping by remote sensing data processing and GIS spatial analysis. The area study in research is

External Contact Person: 

Email: 

Undefined

Bibliographic reference: 

Shahabi, H., B. B. Ahmad, and S. Khezri. "Landslide susceptibility mapping using image satellite and GIS technology." International Journal of Engineering Research and Technology. Vol. 1. No. 6 (August-2012). ESRSA Publications, 2012.

ALOS, ENVISAT

Disaster Cycle Phase: 

  • Preparedness

Space Technology/Product and Application: 

  • EO/RS
  • Landslide Hazard Assessment

Field of Application: 

  • Disaster Type
  • Mass Movement

Satellite: 

Undefined

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