What is the purpose of a "GPS baseline" in surveying?

A GPS baseline refers to the fixed distance measured between two GPS receivers, which is essential for determining precise locations on the Earth's surface. In surveying, establishing a baseline allows for the collection of position data that can be analyzed to improve accuracy. By knowing the distance and incorporating the timing data transmitted by the satellites, surveyors can calculate the relative positions of the receivers with great precision.

The use of baselines is fundamental in Differential GPS (DGPS) systems where the difference in positions obtained from the receivers at known locations is used to correct the GPS data. This correction leads to significant improvements in the accuracy of position determination that is vital for surveying tasks.

Other choices involve concepts that are somewhat related, but they do not encompass the specific and practical measurement functions that GPS baselines provide in surveying operations.