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*Adaptation of the Roman site to the topography
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The Roman wall and defensive towers around Barcino, the 2000 year-old city that was the beginnings of Barcelona, are centered on a very special intersection. The cardo decumanus is ground zero for the centuriation of the lands in the area, and was likely set out in a spiritual siting and orienting event by the Roman survey team about 4 BC. It would have been located based on three decisions*:
1) determine the decumanus maximus by observing the direction of the rising sun on the day of the founding.
2) determine the line that would become the cardo maximus, in this case the line orthogonal with the coastline.
3) determine the course of the parallel streets to be laid out over time.
*Busquets, Joan. Barcelona: the urban evolution of a compact city, 2005.
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