# What are the highest and lowest precision Coordinate Reference Systems for US East Coast?

And does it matter what system your data layer begins with if you choose the right system for your project? Do some applications use more precise projection systems than others?

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Perhaps you mean "accuracy" instead of "precision"? See gis.stackexchange.com/questions/8650/… for the distinction. – whuber Feb 20 '13 at 22:48
Accuracy is how often a target gets hit in a certain spot (reliability). The nice thing about math, is it's highly reliable. No, I mean which system comes the closest to projecting coordinates with the precision I'd find walking through the city with a tape measure. Or is this just a ridiculous comparison. I'm willing to look ridiculous, gotta pay my dues. – Fred Feb 20 '13 at 23:23
I suppose part of my distorted paradigm is distortion itself. If we talk about a group of data points all having varying degrees of distortion due to there distance from a conceptual projection curve then I agree there can be a difference in Accuracy of points in a set relative to different projections. I'd like to know if using one coordinate system will get a given group of points closer to the real than another (higher precision) and conversely if some should be avoided as archaic. But thanks for the ref. I'll look deeper. – Fred Feb 20 '13 at 23:36
You appear to be confused about the distinction between accuracy and precision. Almost all GISes will compute projections to sub-micron precision. It sounds like you are interested in questions that compare the metric distortion of projections. – whuber Feb 20 '13 at 23:46
Yes, Yes, it's not the precision of the calculation I care about if it doesn't hit the mark with precision. But the distance between the calculated stone on the ground and the stone on the ground is it's precision. How many times it gets the same result is it's accuracy. – Fred Feb 20 '13 at 23:49