Point based assessment

Selecting the best way to represent landslide polygon as point frequency in landslide investigation

Norbert Simon, Michael Crozier, Mairead de Roiste, Abdul Ghani Rafek

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study evaluates two common methods to represent landslide polygons as frequencies for use within GIS analysis. These methods are used to extract information from factor maps, such as a single value for slope angle for the landslide polygon, which is then used in hazard assessment. Understanding the errors associated with generating points to represent landslide polygons should be clearly understood to evaluate the effectiveness of these points. In this paper, the effectiveness of two representation techniques in gathering slope angle information is examined. The first technique evaluated is based on the centroid (a point feature) of each landslide polygon. The value of the landslide factor class beneath the centroid point, e.g. the slope value at that point, selects the landslide factor class. The second method is an area based technique which depends on the area covered by different landslide factor classes, e.g. the most common slope for the polygon. Here, the landslide factor class that occupies most of the landslide polygon is selected as the attribute for each landslide polygon. As demonstrated in this paper, the results favour the area based technique. While this paper explores this technique for slope information, the finding is applicable to other landslide causal factors, such as elevation and rock type.

Original languageEnglish
Pages (from-to)775-784
Number of pages10
JournalElectronic Journal of Geotechnical Engineering
Volume18 D
Publication statusPublished - 2013

Fingerprint

Landslides
polygon
landslide
slope angle
hazard assessment
Geographic information systems
Hazards
GIS
Rocks

Keywords

  • Area based technique
  • Centroid point
  • GIS
  • Landslide

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Point based assessment : Selecting the best way to represent landslide polygon as point frequency in landslide investigation. / Simon, Norbert; Crozier, Michael; de Roiste, Mairead; Rafek, Abdul Ghani.

In: Electronic Journal of Geotechnical Engineering, Vol. 18 D, 2013, p. 775-784.

Research output: Contribution to journalArticle

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