Sunday, 30 September 2012


Annoyingly, the Opta position coordinates are in units of percent. In the x-direction zero (%) is the defending goal line, and 100 (%) is the opposition goal line. Then, in the y-direction (cross-field) the "near" side is zero (%), and the "far" side is 100 (%).

I can see the reason for using percent, rather than a typical distance unit (metres, yards, chain, nanometres), not every pitch has the same dimensions. However, it means you need to be very careful when calculating anything related to distance.

Anyway, groan....

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