What is a common transformation between US datums?

The choice indicating that all transformations are common between US datums is accurate because each of these pairs represents an established transformation process used to convert geographic coordinates from one datum to another.

The transformation between NAD27 and NAD83 involves a change in the underlying technologies and methodologies used for mapping and data collection, as NAD27 is based on a different Earth model than NAD83. The adjustment reflects shifts in the actual coordinates of landmarks or control points to better fit the more accurate Earth model in NAD83.

Similarly, the transformation between NAD27 and WGS84 encompasses the conversion between the older North American datum and the World Geodetic System, which is widely used for global positioning systems (GPS) and various applications in geospatial analysis. WGS84 is more universally applicable due to its international acceptance and comprehensive definition of the Earth’s surface.

The conversion between NAD83 and WGS84 is particularly relevant as well, considering that NAD83 was designed to be geocentric and closely aligns with WGS84. Although the two datums are similar, minor discrepancies can necessitate transformations in certain contexts or applications.

Ultimately, all these transformations are integral components of geographic information systems, making the selection of the choice indicating that all transformations are common between US datums