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[fitsbits] CRPIX clarification
On Mon 2008/06/16 17:36:27 MST, Rob Seaman wrote in a message to: Mark Calabretta and copied to: Eric Greisen , FITSbits , William Pence Dear Rob, The question is whether this discussion of randomness adds anything to the specific paragraph. I believe it is useful to explain one thing by pointing out the distinction with another. If the reader doesn't know anything about random groups data then they can read over it. (That's why it's in parentheses.) BTW, "random" is not an apt description, "irregular" would have been better. Isn't the distinction here between a repeating lattice and an individual datum, not between regular and random structure? The distinction is between defining a rule for computing the world coordinates of each datum, and recording the world coordinates of each datum. In the former case, neither pixel coordinates nor world coordinates are recorded. Pixel coordinates are inferred from array indices and that is only possible because the data form a regular lattice. That is not possible for the random parameter component of random groups data because they are not regular. Therefore, you have to record the world coordinate of each datum, or more usually, each array of data. That is what the random parameters themselves are. Regards, Mark |
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