Assessing geographic data usability in analytical contexts: Undertaking sensitivity analysis of geospatial processes

Robin Frew, Gary Higgs, Mitchel Langford, Jenny Harding

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Abstract

This paper addresses the comparative dearth of research on spatial data usability by employing sensitivity analyses to the findings from applying GIS-based accessibility models. Comparisons were made using approaches based on Euclidean distances and more sophisticated accessibility measures that utilise network travel distances: the latter incorporating measures of supply and demand by using innovative extensions to the Two-Step Floating Catchment Area method (2SFCA). To illustrate the sensitivity of findings from applying such models with a range of data sources, geographic accessibility to secondary schools was calculated for Output Areas in South Wales using a 2SFCA plug-in to ArcGIS(TM). By using different permutations of spatial data, for both the supply-and demand-side parameters in such models,differences in walking distances and FCA scores were sought in order to comment on the usability of such data sources. Preliminary conclusions are made on the appropriateness of such data sets in relation to different types of network-based accessibility modelling tasks
Original languageEnglish
Title of host publicationProceedings of 23rd Annual GIS Research UK Conference
Subtitle of host publication(GISRUK 2015)
PublisherUniversity of Leeds
Pages206-213
Publication statusPublished - Apr 2015
EventProceedings of 23rd Annual GIS Research UK Conference : Big Data and the Future of GIS - School of Geography, University of Leeds, Leeds, United Kingdom
Duration: 15 Apr 201517 Apr 2015

Conference

ConferenceProceedings of 23rd Annual GIS Research UK Conference
Abbreviated titleGISRUK2015
Country/TerritoryUnited Kingdom
CityLeeds
Period15/04/1517/04/15

Keywords

  • Usability
  • gis-based accessibility models
  • spatial data
  • Sensitivity analysis
  • E2SFCA
  • Two Step Floating Catchment Area (2SFCA)

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