What is the maximum allowable relative positional precision stipulated for certain surveys?

The maximum allowable relative positional precision is a critical standard in surveying, as it dictates the acceptable level of accuracy for measurements collected during certain types of surveys. For many land surveys, especially in the context of public works or engineering projects, a relative positional precision of 2 cm is a commonly recognized standard. This level of precision ensures that the measurements taken are accurate enough for many practical applications, such as construction, boundary definition, and spatial planning.

In comparison, the other options may not align with established standards for the types of surveys addressed. For instance, 1 cm might be considered too stringent for particular surveys unless they are highly specialized; 0.07 feet (approximately 2.13 cm) is essentially equivalent to 2 cm but is expressed in a less common unit, and 50 ppm (parts per million) might apply in different contexts or types of precision but does not directly translate to a positional accuracy in common use for various land surveys. Therefore, the recognition of 2 cm as a standard reflects industry practices that balance precision with practicality in surveying tasks.