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Measuring Mobility in Afghanistan Using Time-Cost Raster Models : Methodology Note (Inglês)

This note describes the methodology underlying a time-cost raster model to measure cross-country mobility. One direct application of this model is to measure service accessibility through the creation of catchment areas and is highlighted in the case study below. While this model can be adapted for any country, the underlying assumptions and data used are currently tailored for the Afghanistan context. Recent improvements in the local detail and resolution of satellite imagery and in computational methods allow the authors to address limitations in the distance-based measures of access. In the same vein the authors measure access from a location to a destination in units of time rather than linear distance. Second, the authors use detailed data sources to account for the local geographic context at 10m taking advantage of the computational efficiencies gained and the complete spatial coverage of the gridded data structure rather than a vector data structure. Third, the authors suggest a method to construct a topologically correct network of paths and roads, since the road coverage is incomplete.

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