On Sat, Jul 17, 2021 at 07:17:09PM -0400, Christian Hopps wrote: > > > > On Jul 17, 2021, at 6:14 PM, Benjamin Kaduk <[email protected]> wrote: > > > > So, when we refine the coord-accuracy and height-accuracy for an > > instantiation of the grouping, what does that mean? > > It’s supposed to mean the accuracy of the measurement that is recorded in the > grouping. So if the coord-accuracy is .1 and the measurement is lat/long then > the accuracy is within 1/10 of a decimal degree. if the measurement is in > cart coordinates the accuracy would be 100cm. I don’t think we need to make > this anymore complex than that. Is there some text you would like to see to > make that clearer?
The accuracy of the measurement with respect to what? The coordinate system, or the actual physical object? And, if the concept here is that "I made a measurement, and my measurement device reported a value to 1/10 of a decimal degree", that would typically correspond to a "precision" rather than an "accuracy" (https://en.wikipedia.org/wiki/Accuracy_and_precision). In either case, I think that "accuracy of the measurement recorded in the grouping" is a qualitatively different concept of "accuracy" than the listed accuracy of the geodetic-datum, which (AIUI) relates to the maximum deviation between the model of the object used by the coordinate system and the actual physical object. So it's not really clear that we should be talking the one "overriding" the other. -Ben _______________________________________________ netmod mailing list [email protected] https://www.ietf.org/mailman/listinfo/netmod
