On the webpage about the projection EPSG:5071 (NAD83(HARN) / Conus Albers), it is said that the accuracy:
Remarks: Accuracy 0.1 to 0.2m in California, 0.05-0.11 in Oregon, elsewhere better than 0.05m.
The WKT says that it is a
Albers_Conic_Equal_Area projection. But no projection can preserve distance everywhere. My questions are:
How can a projection achieve sub-meter accuracy over such a large geographical extent?
What exactly does the "accuracy" (of 1 meter or 0.1 meter) referred to in epsg.io mean? Do they mean that distance is only off by no more than a meter in the contiguous US? If not, how much is distance off here in the worst case?