|nad83 to 27||1.43||0.5||8078||86|
Unlike the NAD 83, the NAD 27 is not capable of supporting the three-dimensional capabilities of modern positioning technology. Moreover, the North American Datum 27 and the North American Datum 83 are also different in their ellipsoids. It has been seen that the centre points of the NAD 27 and NAD 83 are in different locations.What does NAD83 stand for?
The North American Datum of 1983 (NAD 83) is a unified horizontal or geometric datum and successor to NAD27 providing a spatial reference for Canada and the United States. NAD83 corrects some of the distortions from NAD27 over distance by using a more dense set of positions from terrestrial and Doppler satellite data.How big is the difference between UTM and NAD 27?
Changes to UTM values are generally larger, around 200 meters, and changes for other coordinate systems are different. Why are the NAD 83 position values so far from the NAD 27 values?Can I convert latitudes based on old datums to NAD 83?
Consequently, the shift between the various datums are not uniform across the United States and there is no single value that can be applied to latitudes or to longitudes based on old datums to convert them to NAD 83. NADCON was developed in order to facilitate conversion between the datums,.