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Friday, May 21, 2010
Gameday Mapping XY Coordinates
Something interesting about the hit location mappings on MLB.com for the pixels. A pixel is granular, an integer. There is no such things as 0.24 pixels. When an entry is plotted, it should be marked at coordinate 125,160 or whatever. It can’t be marked at coordinate 125.64 and 160.42. But, that is how it is being marked.
More strangely is the distribution of how often those decimals occur. They should be somewhat random and uniform. Now, seeing that we shouldn’t have those decimals to begin with, there must be some conversion happening in the interim (pixel to something to pixel). And in that conversion process, decimals appear. And they appear in a non-random systematic way. Here is the frequency of how often they occur:
You should note two things:
1. How much the x and y mirror each other
2. How there is almost no data points below .10 or above .90.
And, the pairing of the X and Y are not-random. For example, here is how often the X decimal value appears for Y value decimal of .67:
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