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Old 12-21-2014, 12:54 PM   #56
JDCAVE
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Richard: there is nothing that I have said above that is inconsistent with your linked reference. However, I stand by what I have said. Precision in this instance relates almost entirely to measurement error, not post-processing of the data. In addition, it is correct procedure to NOT round until all intermediate steps are taken in a series of calculations (see floating point). Rounding errors are cumulative and can compound differences over a number of steps. I am uncertain if floating point problems are an issue to be concerned with cartography, however there may be effects in algorithms used in post processing of data. I would classify this as model error, likely resulting in "bias" rather than reproducibility error (precision).


Jim
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