Reducing the uncertainty induced by spatial aggregation in accessibility and spatial interaction applications |
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Institution: | 1. Institute of Geography and Spatial Organization, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warsaw, Poland;2. European Commission, Joint Research Centre, Directorate for Growth and Innovation, Territorial Development Unit, Via E. Fermi 2749, 21027 Ispra, Italy |
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Abstract: | Analyses of spatial interaction are to some degree plagued by uncertainty regarding the impact of spatially dispersed interaction masses within zones on travel times. In this paper, interaction-weighted travel times are computed from a matrix between regularly distributed points at fine resolution, and used together with secondary data to improve estimates of interaction weighted travel time based on commonly applied methods. The paper proposes a method for computing intra-zonal, interaction weighted travel times that is considerably less sensitive to spatial aggregation than existing approaches, and demonstrates that population-weighted centroids are to be preferred over geographically-weighted centroids. |
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