Spatial sustainability is a very interesting subject for research, particularly in view of its enormous potential public policy applicability. The concept of accessibility has an interesting dual dimension, being both geographical and social. The measurement of physical or geographical accessibility contributes to the knowledge of whether public services are being provided adequately – equitably – to serve the whole population of the study territory irrespective of where people live.
There are many different indicators of accessibility, mostly based on distance and user satisfaction. The main difficulty resides in the measurement process itself. The use of Geographic Information System (GIS) has helped to make this task easier and,consequently, to expand the possibilities of present and future analyses.
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